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Cyclopentadienylmolybdenum tricarbonyl dimer
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<h2 id="structure-and-synthesis">Structure and synthesis</h2> <p>The molecule exists in two <a href="/facts/Rotamer/JflrT5Ws">rotamers</a>, gauche and anti.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> The six CO ligands are terminal and the Mo-Mo bond distance is 3.2325 Å.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> The compound is prepared by treatment of <a href="/facts/Molybdenum_hexacarbonyl/anfQoYDJ">molybdenum hexacarbonyl</a> with <a href="/facts/Sodium_cyclopentadienide/l7JaX1NP">sodium cyclopentadienide</a> followed by oxidation of the resulting NaMo(CO)3(C5H5).<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> Other methods have been developed starting with Mo(CO)3(CH3CN)3 instead of Mo(CO)6.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> </p> <h2 id="reactions">Reactions</h2> <p><a href="/facts/Thermal_decomposition/Qqx9RqkW">Thermolysis</a> of this compound in hot solution of <a href="/facts/Diglyme/GEAdmlEX">diglyme</a> (bis(2-methoxyethyl)ether) results in decarbonylation, giving the tetracarbonyl,<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> which has a formal triple bond between the Mo centers (<i>d</i>MoMo = 2.448 Å):<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p> (C5H5)2Mo2(CO)6 → (C5H5)2Mo2(CO)4 + 2 CO <p>The resulting cyclopentadienylmolybdenum dicarbonyl dimer in turn binds a variety of substrates across the metal-metal triple bond. </p> <h2 id="related-compounds">Related compounds</h2> <ul><li><a href="/facts/Cyclopentadienyltungsten_tricarbonyl_dimer/CSktj6UG">Cyclopentadienyltungsten tricarbonyl dimer</a></li> <li><a href="/facts/Cyclopentadienylchromium_tricarbonyl_dimer/5GTsBh1G">Cyclopentadienylchromium tricarbonyl dimer</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Brian Mann (1997-01-06). "Fluxionality of Cp2Mo2(CO)6". University of Sheffield. <a href="http://brian-mann.staff.shef.ac.uk/Cp2Mo2CO6.html" target="_blank">http://brian-mann.staff.shef.ac.uk/Cp2Mo2CO6.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>R. D. Adams, D. M. Collins, and F. A. Cotton (1974). "Molecular Structures and Barriers to Internal Rotation in Bis(η5-cyclopentadienyl)hexacarbonylditungsten and Its Molybdenum Analog". Inorg. Chem. 13 (5): 1086–1090. doi:10.1021/ic50135a015.{{cite journal}}: CS1 maint: multiple names: authors list (link) <a href="/wiki/F._A._Cotton" target="_blank">/wiki/F._A._Cotton</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Manning, A. R.; Hacket, Paul; Birdwhistell, Ralph (1990). "Hexacarbonylbis(η5-Cyclopentadienyl)Dichromium, Molybdenum, and Tungsten and their Analogs, M2(η5-C5H4R)2(CO)6 (M = Cr, Mo, and W; R = H, Me or PhCH2)". Inorganic Syntheses. 28: 148–149. doi:10.1002/9780470132593.ch39. ISBN 9780470132593. <a href="9780470132593" target="_blank">9780470132593</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Curtis, M. David; Hay, Michael S. (1990). "Cyclopentadienyl Metal Carbonyl Dimers of Molybdenum and Tungsten". Inorganic Syntheses. Inorganic Syntheses. Vol. 28. pp. 150–152. doi:10.1002/9780470132593.ch40. ISBN 9780470132593. <a href="9780470132593" target="_blank">9780470132593</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Curtis, M. David; Hay, Michael S. (1990). "Cyclopentadienyl Metal Carbonyl Dimers of Molybdenum and Tungsten". Inorganic Syntheses. Inorganic Syntheses. Vol. 28. pp. 150–152. doi:10.1002/9780470132593.ch40. ISBN 9780470132593. <a href="9780470132593" target="_blank">9780470132593</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Cotton, F. A.; Walton, R. A. "Multiple Bonds Between Metal Atoms" Oxford (Oxford): 1993, p 564ff. ISBN 0-19-855649-7. <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> </ol>