Keywords: Metallocenes / Structural analysis / Density functional calculations / Cobalt (1) was synthesised and its structure derived by X-ray crystallography and spectroscopic methods in conjunction with theoretical calculations. To gain an insight into the effect of these bridging atoms and the exocyclic substituents on the sandwich structure, a study was undertaken in which comparisons were drawn between this ansa-cobaltocenium ion and other previously reported struc-
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