Metal–metal bond

In inorganic chemistry, metal–metal bonds describe attractive interactions between metal centers.

In those cases, it is difficult to state unequivocably that the metal-metal bond is the cohesive force binding the two metals together.

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.

[4] Isolable complexes with multiple bonds are most common among the transition metals in the middle of the d-block, such as rhenium, tungsten, technetium, molybdenum and chromium.

As dimers of Nb(III), they feature double metal–metal bonds, the maximum possible for a pair of metals with d2 configuration.

[7] Hexa(tert-butoxy)ditungsten(III) is a well studied example of a complex with a metal–metal triple bond.