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srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Polyselenide.svg/330px-Polyselenide.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Polyselenide.svg/440px-Polyselenide.svg.png 2x" data-file-width="294" data-file-height="96" /></a><figcaption>Structures of two polyselenide anions.</figcaption></figure> <p>In <a href="/wiki/Chemistry" title="Chemistry">chemistry</a>, a <b>polyselenide</b> usually refers to anions of the formula (Se<sub>n</sub>)<sup>2-</sup>, where Se is the <a href="/wiki/Chemical_symbol" title="Chemical symbol">atomic symbol</a> for the element <a href="/wiki/Selenium" title="Selenium">selenium</a>. Many <a href="/wiki/Main_group" class="mw-redirect" title="Main group">main group</a> and <a href="/wiki/Transition_metal" title="Transition metal">transition metals</a> form complexes with polyselenide anions.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Preparation">Preparation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Polyselenide&action=edit&section=1" title="Edit section: Preparation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Conceptually, polyselenides are derived by deprotonation polyselenanes H<sub>2</sub>Se<sub>n</sub>, but such species are rare or unstable. Instead, analogous to the preparation of many <a href="/wiki/Zintl_ion" class="mw-redirect" title="Zintl ion">Zintl ions</a>, polyselenides are produced by reduction of elemental Se with alkali metals. Such reactions can be conducted by heating a mixture of the solids or by dissolving Se metal in amine solutions of alkali metals. Synthesis can also be conducted in high-boiling, polar, aprotic solvents such as DMF, HMPA, and NMP.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> These reactions appear to proceed by initial formation of the alkali metal selenide, followed by the reaction of the latter with additional selenium: </p> <dl><dd>2 Na + Se → Na<sub>2</sub>Se</dd> <dd>Na<sub>2</sub>Se + <i>n</i> Se → Na<sub>2</sub>Se<sub><i>n</i>+1</sub></dd></dl> <p>Once generated, alkali metal polyselenides can be converted to lipophilic salts by treatment <a href="/wiki/Cryptand" title="Cryptand">cryptand</a> ligands or by ion exchange with <a href="/wiki/Quat_salts" class="mw-redirect" title="Quat salts">quat salts</a>.<sup id="cite_ref-Kolis_3-0" class="reference"><a href="#cite_note-Kolis-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <dl><dd>Na<sub>2</sub>Se<sub><i>n</i></sub> + 2 R<sub>4</sub>NCl → (R<sub>4</sub>N)<sub>2</sub>Se<sub><i>n</i></sub> + 2 NaCl</dd></dl> <div class="mw-heading mw-heading2"><h2 id="Structures">Structures</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Polyselenide&action=edit&section=2" title="Edit section: Structures"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Salts of polyselenides have often been characterized by <a href="/wiki/X-ray_crystallography" title="X-ray crystallography">X-ray crystallography</a>. Polyselenides salts generally feature open chains, which adopt a zig-zag conformation. In rare cases, cyclic structures are observed as in Li<sub>2</sub>Se<sub>5</sub>, which features a square-planar Se center. High resolution solid state <sup>77</sup>Se NMR spectra of [NMe<sub>4</sub>]<sub>2</sub>Se<sub>6</sub> show three selenium sites. Single-crystal X-ray structure determination of the two salts support the NMR data.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Reactivity">Reactivity</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Polyselenide&action=edit&section=3" title="Edit section: Reactivity"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Cp2TiiSe5.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Cp2TiiSe5.svg/220px-Cp2TiiSe5.svg.png" decoding="async" width="220" height="121" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Cp2TiiSe5.svg/330px-Cp2TiiSe5.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Cp2TiiSe5.svg/440px-Cp2TiiSe5.svg.png 2x" data-file-width="151" data-file-height="83" /></a><figcaption>Structure of (C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>TiSe<sub>5</sub>.</figcaption></figure> <p>Polyselenides are prone to decomposition on exposure to air, in which case they are oxidized back to elemental selenium. </p> <dl><dd><span class="chemf nowrap">Se<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">2−</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"><i>n</i></sub></span></span></span> + 2 H<sup>+</sup> + <style data-mw-deduplicate="TemplateStyles:r1154941027">.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style><span class="frac"><span class="num">1</span>⁄<span class="den">2</span></span> O<sub>2</sub> → <i>n</i> Se + H<sub>2</sub>O</dd></dl> <p>As ligands in <a href="/wiki/Coordination_complex" title="Coordination complex">coordination complexs</a>, polyselenides are generally bidentate. Complexes of penta-, tetra-, and triselenide ligands are known. One example is the spirocyclic [Zn(Se<sub>4</sub>)<sub>2</sub>]<sup>2-</sup>.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Polyselenide&action=edit&section=4" title="Edit section: Further reading"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFGrafAssoudMayasreeKleinke2009" class="citation journal cs1">Graf, Christian; Assoud, Abdeljalil; Mayasree, Oottil; Kleinke, Holger (2009). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6255372">"Solid State Polyselenides and Polytellurides: A Large Variety of Se–Se and Te–Te Interactions"</a>. <i>Molecules</i>. <b>14</b> (9): <span class="nowrap">3115–</span>3131. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.3390%2Fmolecules14093115">10.3390/molecules14093115</a></span>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6255372">6255372</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/19783911">19783911</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Molecules&rft.atitle=Solid+State+Polyselenides+and+Polytellurides%3A+A+Large+Variety+of+Se%E2%80%93Se+and+Te%E2%80%93Te+Interactions&rft.volume=14&rft.issue=9&rft.pages=%3Cspan+class%3D%22nowrap%22%3E3115-%3C%2Fspan%3E3131&rft.date=2009&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC6255372%23id-name%3DPMC&rft_id=info%3Apmid%2F19783911&rft_id=info%3Adoi%2F10.3390%2Fmolecules14093115&rft.aulast=Graf&rft.aufirst=Christian&rft.au=Assoud%2C+Abdeljalil&rft.au=Mayasree%2C+Oottil&rft.au=Kleinke%2C+Holger&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC6255372&rfr_id=info%3Asid%2Fen.wikipedia.org%3APolyselenide" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFSheldrick2012" class="citation journal cs1">Sheldrick, William S. (2012). "Polychalcogenide Anions: Structural Diversity and Ligand Versatility". <i>Zeitschrift für Anorganische und Allgemeine Chemie</i>. <b>638</b> (15): <span class="nowrap">2401–</span>2424. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2Fzaac.201200241">10.1002/zaac.201200241</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Zeitschrift+f%C3%BCr+Anorganische+und+Allgemeine+Chemie&rft.atitle=Polychalcogenide+Anions%3A+Structural+Diversity+and+Ligand+Versatility&rft.volume=638&rft.issue=15&rft.pages=%3Cspan+class%3D%22nowrap%22%3E2401-%3C%2Fspan%3E2424&rft.date=2012&rft_id=info%3Adoi%2F10.1002%2Fzaac.201200241&rft.aulast=Sheldrick&rft.aufirst=William+S.&rfr_id=info%3Asid%2Fen.wikipedia.org%3APolyselenide" class="Z3988"></span></li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Polyselenide&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Polytelluride" title="Polytelluride">Polytelluride</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Polyselenide&action=edit&section=6" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFGreenwoodEarnshaw1997" class="citation book cs1"><a href="/wiki/Norman_Greenwood" title="Norman Greenwood">Greenwood, Norman N.</a>; Earnshaw, Alan (1997). <i>Chemistry of the Elements</i> (2nd ed.). <a href="/wiki/Butterworth-Heinemann" title="Butterworth-Heinemann">Butterworth-Heinemann</a>. p. 763-765. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-08-037941-8" title="Special:BookSources/978-0-08-037941-8"><bdi>978-0-08-037941-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Chemistry+of+the+Elements&rft.pages=763-765&rft.edition=2nd&rft.pub=Butterworth-Heinemann&rft.date=1997&rft.isbn=978-0-08-037941-8&rft.aulast=Greenwood&rft.aufirst=Norman+N.&rft.au=Earnshaw%2C+Alan&rfr_id=info%3Asid%2Fen.wikipedia.org%3APolyselenide" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFThompsonBoudjouk1988" class="citation journal cs1">Thompson, D.; Boudjouk, P. A (1988). "Convenient Synthesis of Alkali Metal Selenides and Diselenides in Tetrahydrofuran and the Reactivity Differences Exhibited By These Salts Toward Organic Bromides". <i>Journal of Organic Chemistry</i>. <b>53</b>: 2109-2112. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1021%2Fjo00244a051">10.1021/jo00244a051</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Journal+of+Organic+Chemistry&rft.atitle=Convenient+Synthesis+of+Alkali+Metal+Selenides+and+Diselenides+in+Tetrahydrofuran+and+the+Reactivity+Differences+Exhibited+By+These+Salts+Toward+Organic+Bromides&rft.volume=53&rft.pages=2109-2112&rft.date=1988&rft_id=info%3Adoi%2F10.1021%2Fjo00244a051&rft.aulast=Thompson&rft.aufirst=D.&rft.au=Boudjouk%2C+P.+A&rfr_id=info%3Asid%2Fen.wikipedia.org%3APolyselenide" class="Z3988"></span></span> </li> <li id="cite_note-Kolis-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-Kolis_3-0">^</a></b></span> <span class="reference-text">Kolis, J. "Coordination Chemistry of Polychalcogen Anions and Transition Metal Carbonyls" Coordination Chemistry Reviews 1990, volume 105, pp. 195-219. <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2F0010-8545%2890%2980023-M">10.1016/0010-8545(90)80023-M</a></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text">Barrie, P. J.; Clark, R. J. H.; Selenium Solid-State NMR Spectroscopy and Structures of Tetramethylammonium Pentaselenide and Hexaselenide Complexes. Inorg. Chem, 1995, 34, 4299–4304 DOI: 10.1021/ic00121a006</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFKanatzidis1990" class="citation journal cs1">Kanatzidis, Mercouri G. (1990). "Soluble Polychalcogenides of the Late Transition and Main Group Elements". <i>Comments on Inorganic Chemistry</i>. <b>10</b> (<span class="nowrap">4–</span>5): <span class="nowrap">161–</span>195. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1080%2F02603599008048650">10.1080/02603599008048650</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Comments+on+Inorganic+Chemistry&rft.atitle=Soluble+Polychalcogenides+of+the+Late+Transition+and+Main+Group+Elements&rft.volume=10&rft.issue=%3Cspan+class%3D%22nowrap%22%3E4%E2%80%93%3C%2Fspan%3E5&rft.pages=%3Cspan+class%3D%22nowrap%22%3E161-%3C%2Fspan%3E195&rft.date=1990&rft_id=info%3Adoi%2F10.1080%2F02603599008048650&rft.aulast=Kanatzidis&rft.aufirst=Mercouri+G.&rfr_id=info%3Asid%2Fen.wikipedia.org%3APolyselenide" class="Z3988"></span></span> </li> </ol></div> <div 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class="navbox-list navbox-odd" style="width:100%;padding:0;border-width:0;"><div style="padding:0"><div class="mw-collapsible-content" style="overflow-x:auto"> <table class="center"> <tbody><tr style="background-color:mistyrose"> <td><a href="/wiki/Hydrogen_selenide" title="Hydrogen selenide">H<sub>2</sub>Se</a><br /><a href="/wiki/Hydrogen_diselenide" title="Hydrogen diselenide">H<sub>2</sub>Se<sub>2</sub></a><br /><a href="/wiki/Hydride_selenide" title="Hydride selenide">+H</a><br /><a href="/wiki/Hydroselenide" title="Hydroselenide">-H</a> </td> <td style="background-color:white;color:inherit;border:none"> </td> <td style="background-color:white;color:inherit;border:none" colspan="11" rowspan="3"> </td> <td style="background-color:white;color:inherit;border:none" colspan="5"> </td> <td>He </td></tr> <tr style="background-color:mistyrose;color:black;"> <td><a href="/wiki/Lithium_selenide" title="Lithium selenide">Li<sub>2</sub>Se</a> </td> <td>Be </td> <td><a href="/wiki/Selenide_borate" title="Selenide borate">Se<sub><span class="texhtml mvar" style="font-style:italic;">x</span></sub>B<sub><span class="texhtml mvar" style="font-style:italic;">y</span></sub>O<sub><span class="texhtml mvar" style="font-style:italic;">z</span></sub></a> </td> <td><a href="/wiki/Carbon_diselenide" title="Carbon diselenide">CSe<sub>2</sub></a><br /><a href="/wiki/Carbonyl_selenide" title="Carbonyl selenide">OCSe</a><br /><a href="/wiki/Dimethyl_selenide" title="Dimethyl selenide">(CH<sub>3</sub>)<sub>2</sub>Se</a> </td> <td><a href="/wiki/Ammonium_selenide" title="Ammonium selenide">(NH<sub>4</sub>)<sub>2</sub>Se</a> </td> <td>O </td> <td>F </td> <td>Ne </td></tr> <tr style="background-color:mistyrose;color:black;"> <td><a href="/wiki/Sodium_selenide" title="Sodium selenide">Na<sub>2</sub>Se</a> </td> <td><a href="/wiki/Magnesium_selenide" title="Magnesium selenide">MgSe</a> </td> <td><a href="/wiki/Aluminium_selenide" title="Aluminium selenide">Al<sub>2</sub>Se<sub>3</sub></a> </td> <td>Si </td> <td><a href="/wiki/Phosphorus_selenide" title="Phosphorus selenide">P<sub><span class="texhtml mvar" style="font-style:italic;">x</span></sub>Se<sub><span class="texhtml mvar" style="font-style:italic;">y</span></sub></a><br /><a href="/wiki/Selenophosphate" title="Selenophosphate">-P</a> </td> <td><a href="/wiki/Sulfoselenide" class="mw-redirect" title="Sulfoselenide">+S</a> </td> <td>Cl </td> <td>Ar </td></tr> <tr style="background-color:mistyrose;color:black;"> <td><a href="/wiki/Potassium_selenide" title="Potassium selenide">K<sub>2</sub>Se</a> </td> <td><a href="/wiki/Calcium_selenide" title="Calcium selenide">CaSe</a> </td> <td style="background-color:white;color:inherit;border:none"> </td> <td><a href="/w/index.php?title=Scandium_selenide&action=edit&redlink=1" class="new" title="Scandium selenide (page does not exist)">Sc<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/wiki/Titanium_diselenide" title="Titanium diselenide">TiSe<sub>2</sub></a> </td> <td>V </td> <td><a href="/wiki/Chromium(II)_selenide" title="Chromium(II) selenide">CrSe</a><br /><a href="/wiki/Chromium(III)_selenide" title="Chromium(III) selenide">Cr<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/wiki/Manganese(II)_selenide" title="Manganese(II) selenide">MnSe</a><br /><a href="/wiki/Manganese_diselenide" title="Manganese diselenide">MnSe<sub>2</sub></a> </td> <td><a href="/wiki/Iron(II)_selenide" title="Iron(II) selenide">FeSe</a> </td> <td><a href="/wiki/Cobalt(II)_selenide" title="Cobalt(II) selenide">CoSe</a> </td> <td><a href="/wiki/Nickel_selenide" title="Nickel selenide">NiSe</a> </td> <td><a href="/wiki/Copper(I)_selenide" title="Copper(I) selenide">Cu<sub>2</sub>Se</a><br /><a href="/wiki/Copper(II)_selenide" title="Copper(II) selenide">CuSe</a> </td> <td><a href="/wiki/Zinc_selenide" title="Zinc selenide">ZnSe</a> </td> <td><a href="/wiki/Gallium(II)_selenide" title="Gallium(II) selenide">GaSe</a><br /><a href="/wiki/Gallium(III)_selenide" title="Gallium(III) selenide">Ga<sub>2</sub>Se<sub>3</sub></a><br /><a href="/wiki/Selenogallate" title="Selenogallate">-Ga</a> </td> <td><a href="/wiki/Germanium_monoselenide" title="Germanium monoselenide">GeSe</a><br /><a href="/wiki/Germanium_diselenide" title="Germanium diselenide">GeSe<sub>2</sub></a><br /><a href="/wiki/Selenidogermanate" title="Selenidogermanate">-Ge</a> </td> <td><a href="/wiki/Arsenic_triselenide" title="Arsenic triselenide">As<sub>2</sub>Se<sub>3</sub></a><br /><a href="/w/index.php?title=Tetraarsenic_triselenide&action=edit&redlink=1" class="new" title="Tetraarsenic triselenide (page does not exist)">As<sub>4</sub>Se<sub>3</sub></a> </td> <td><a class="mw-selflink selflink">Se<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1.2em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">2−</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"><i>n</i></sub></span></span></a> </td> <td>Br </td> <td>Kr </td></tr> <tr style="background-color:mistyrose;color:black;"> <td><a href="/wiki/Rubidium_selenide" title="Rubidium selenide">Rb<sub>2</sub>Se<sub></sub></a> </td> <td><a href="/wiki/Strontium_selenide" title="Strontium selenide">SrSe</a> </td> <td style="background-color:white;color:inherit;border:none"> </td> <td><a href="/w/index.php?title=Yttrium_selenide&action=edit&redlink=1" class="new" title="Yttrium selenide (page does not exist)">Y<sub>2</sub>Se<sub>3</sub></a> </td> <td>Zr </td> <td><a href="/wiki/Niobium_diselenide" title="Niobium diselenide">NbSe<sub>2</sub></a><br /><a href="/wiki/Niobium_triselenide" title="Niobium triselenide">NbSe<sub>3</sub></a> </td> <td><a href="/wiki/Molybdenum_diselenide" title="Molybdenum diselenide">MoSe<sub>2</sub></a> </td> <td>Tc </td> <td>Ru </td> <td>Rh </td> <td>Pd </td> <td><a href="/wiki/Silver(I)_selenide" title="Silver(I) selenide">Ag<sub>2</sub>Se</a> </td> <td><a href="/wiki/Cadmium_selenide" title="Cadmium selenide">CdSe</a> </td> <td><a href="/wiki/Indium(II)_selenide" title="Indium(II) selenide">InSe</a><br /><a href="/wiki/Indium(III)_selenide" title="Indium(III) selenide">In<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/wiki/Tin_selenide" title="Tin selenide">SnSe</a><br /><a href="/w/index.php?title=Tin(IV)_selenide&action=edit&redlink=1" class="new" title="Tin(IV) selenide (page does not exist)">SnSe<sub>2</sub></a><br /><a href="/wiki/Selenidostannate" title="Selenidostannate">-Sn</a> </td> <td><a href="/wiki/Antimony_triselenide" title="Antimony triselenide">Sb<sub>2</sub>Se<sub>3</sub></a> </td> <td>Te </td> <td><a href="/wiki/Selenide_iodide" title="Selenide iodide">+I</a> </td> <td>Xe </td></tr> <tr style="background-color:mistyrose;color:black;"> <td><a href="/wiki/Caesium_selenide" title="Caesium selenide">Cs<sub>2</sub>Se</a> </td> <td><a href="/wiki/Barium_selenide" title="Barium selenide">BaSe</a> </td> <td style="background-color:white;color:inherit;border:none">* </td> <td><a href="/w/index.php?title=Lutetium_monoselenide&action=edit&redlink=1" class="new" title="Lutetium monoselenide (page does not exist)">LuSe</a><br /><a href="/wiki/Lutetium(III)_selenide" title="Lutetium(III) selenide">Lu<sub>2</sub>Se<sub>3</sub></a> </td> <td>Hf </td> <td><a href="/wiki/Tantalum_diselenide" title="Tantalum diselenide">TaSe<sub>2</sub></a> </td> <td><a href="/wiki/Tungsten_diselenide" title="Tungsten diselenide">WSe<sub>2</sub></a><br /><a href="/w/index.php?title=Tungsten_triselenide&action=edit&redlink=1" class="new" title="Tungsten triselenide (page does not exist)">WSe<sub>3</sub></a> </td> <td><a href="/wiki/Rhenium_diselenide" title="Rhenium diselenide">ReSe<sub>2</sub></a> </td> <td>Os </td> <td>Ir </td> <td><a href="/wiki/Platinum_diselenide" title="Platinum diselenide">PtSe<sub>2</sub></a> </td> <td>Au </td> <td><a href="/wiki/Mercury_selenide" title="Mercury selenide">HgSe</a> </td> <td><a href="/w/index.php?title=Thallium_selenide&action=edit&redlink=1" class="new" title="Thallium selenide (page does not exist)">Tl<sub>2</sub>Se</a> </td> <td><a href="/wiki/Lead_selenide" title="Lead selenide">PbSe</a> </td> <td><a href="/wiki/Bismuth_selenide" title="Bismuth selenide">Bi<sub>2</sub>Se<sub>3</sub></a> </td> <td>Po </td> <td>At </td> <td>Rn </td></tr> <tr style="background-color:mistyrose;color:black;"> <td>Fr </td> <td>Ra </td> <td style="background-color:white;color:inherit;border:none">** </td> <td>Lr </td> <td>Rf </td> <td>Db </td> <td>Sg </td> <td>Bh </td> <td>Hs </td> <td>Mt </td> <td>Ds </td> <td>Rg </td> <td><a href="/w/index.php?title=Copernicium_selenide&action=edit&redlink=1" class="new" title="Copernicium selenide (page does not exist)">CnSe</a> </td> <td>Nh </td> <td>Fl </td> <td>Mc </td> <td>Lv </td> <td>Ts </td> <td>Og </td></tr> <tr> <td style="background-color:white;color:inherit;border:none" colspan="2" rowspan="3"> </td> <td style="background-color:white;color:inherit;border:none" colspan="20">  </td></tr> <tr style="background-color:mistyrose;color:black;"> <td style="background-color:white;color:inherit;border:none">* </td> <td><a href="/w/index.php?title=Lanthanum_monoselenide&action=edit&redlink=1" class="new" title="Lanthanum monoselenide (page does not exist)">LaSe</a><br /><a href="/w/index.php?title=Lanthanum(III)_selenide&action=edit&redlink=1" class="new" title="Lanthanum(III) selenide (page does not exist)">La<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/wiki/Cerium_monoselenide" title="Cerium monoselenide">CeSe</a><br /><a href="/w/index.php?title=Cerium(III)_selenide&action=edit&redlink=1" class="new" title="Cerium(III) selenide (page does not exist)">Ce<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/wiki/Praseodymium_monoselenide" title="Praseodymium monoselenide">PrSe</a><br /><a href="/w/index.php?title=Praseodymium(III)_selenide&action=edit&redlink=1" class="new" title="Praseodymium(III) selenide (page does not exist)">Pr<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/w/index.php?title=Neodymium_monoselenide&action=edit&redlink=1" class="new" title="Neodymium monoselenide (page does not exist)">NdSe</a><br /><a href="/w/index.php?title=Neodymium(III)_selenide&action=edit&redlink=1" class="new" title="Neodymium(III) selenide (page does not exist)">Nd<sub>2</sub>Se<sub>3</sub></a> </td> <td>Pm </td> <td><a href="/wiki/Samarium(II)_selenide" class="mw-redirect" title="Samarium(II) selenide">SmSe</a><br /><a href="/w/index.php?title=Samarium(III)_selenide&action=edit&redlink=1" class="new" title="Samarium(III) selenide (page does not exist)">Sm<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/wiki/Europium_monoselenide" title="Europium monoselenide">EuSe</a><br /><a href="/wiki/Europium(III)_selenide" title="Europium(III) selenide">Eu<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/w/index.php?title=Gadolinium_monoselenide&action=edit&redlink=1" class="new" title="Gadolinium monoselenide (page does not exist)">GdSe</a><br /><a href="/w/index.php?title=Gadolinium(III)_selenide&action=edit&redlink=1" class="new" title="Gadolinium(III) selenide (page does not exist)">Gd<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/wiki/Terbium_monoselenide" title="Terbium monoselenide">TbSe</a><br /><a href="/w/index.php?title=Terbium(III)_selenide&action=edit&redlink=1" class="new" title="Terbium(III) selenide (page does not exist)">Tb<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/w/index.php?title=Dysprosium_monoselenide&action=edit&redlink=1" class="new" title="Dysprosium monoselenide (page does not exist)">DySe</a><br /><a href="/wiki/Dysprosium(III)_selenide" title="Dysprosium(III) selenide">Dy<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/w/index.php?title=Holmium_monoselenide&action=edit&redlink=1" class="new" title="Holmium monoselenide (page does not exist)">HoSe</a><br /><a href="/wiki/Holmium(III)_selenide" title="Holmium(III) selenide">Ho<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/w/index.php?title=Erbium_monoselenide&action=edit&redlink=1" class="new" title="Erbium monoselenide (page does not exist)">ErSe</a><br /><a href="/wiki/Erbium(III)_selenide" title="Erbium(III) selenide">Er<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/wiki/Thulium_monoselenide" title="Thulium monoselenide">TmSe</a><br /><a href="/wiki/Thulium(III)_selenide" title="Thulium(III) selenide">Tm<sub>2</sub>Se<sub>3</sub></a> </td> <td><a href="/w/index.php?title=Ytterbium_monoselenide&action=edit&redlink=1" class="new" title="Ytterbium monoselenide (page does not exist)">YbSe</a><br /><a href="/w/index.php?title=Ytterbium(III)_selenide&action=edit&redlink=1" class="new" title="Ytterbium(III) selenide (page does not exist)">Yb<sub>2</sub>Se<sub>3</sub></a> </td></tr> <tr 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