A study was conducted on the dicobalt carbide anions, Co2Cn- (n=2 and 3), as a representative of dimetallic carbides of the late 3d transition metals. As such, the electronic and geometric structures were obtained by the method and the calculation similar to those employed in the study of V2C2-. Moreover, the different formation mechanisms of the carbide clusters were indicated between the early and late 3d transition metals.
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