Metal–metal bond
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Unsupported metal–metal bonds
The premier example of a complex with an unsupported metal–metal bond is dimanganese decacarbonyl, Mn2(CO)10. Many metal clusters contain several unsupported M–M bonds. Some examples are M3(CO)12 (M = Ru, Os) and Ir4(CO)12.
A subclass of unsupported metal–metal bonded arrays are linear chain compounds. In such cases the M–M bonding is weak as signaled by longer M–M bonds and the tendency of such compounds to dissociate in solution.
Supported metal–metal bonds
An early example of a supported metal–metal bond is cyclopentadienyliron dicarbonyl dimer, [(C5H5)Fe(CO)2]2. In the predominant isomers of this complex, the two Fe centers are joined not only by an Fe–Fe bond, but also by bridging CO ligands. The related cyclopentadienylruthenium dicarbonyl dimer features an unsupported Ru–Ru bond. Many metal clusters contain several supported M–M bonds. Some examples are Fe3(CO)12 and Co4(CO)12.
Multiple metal–metal bonds
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Nb2Cl6(SMe2)3, featuring a metal–metal double bond.
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Hexa(tert-butoxy)ditungsten(III), featuring a W–W triple bond.
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Chromium(II) acetate, featuring a metal–metal quadruple bond.
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[Ru2(OAc)4Cl]n, where the metal–metal bond order is 2.5.
In addition to M–M single bonds, metal pairs can be linked by double, triple,
The complexes Nb2X6(SR2)3 adopt a face-sharing bioctahedral structures (X = Cl, Br; SR2 = thioether). As dimers of Nb(III), they feature double metal–metal bonds, the maximum possible for a pair of metals with d2 configuration.[6] Hexa(tert-butoxy)ditungsten(III) is a well studied example of a complex with a metal–metal triple bond.[7]
References
- PMID 28715854.
- ISBN 978-0-08-037941-8.
- PMID 16642513.
- ISBN 0-19-855649-7.
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- ISBN 9781118744994.