Addition of protic acids to cobaltocene in benzene produces two types of cobalticinium salts with either colourless diamagnetic or coloured paramagnetic anions; the latter were characterised by their magnetic, spectral, and chemical properties and are considered to contain anions formed by donation of an electron from cobaltocene to an undissociated molecule of acid.
D. V. Banthorpe, B. V. Charlwood, A. Wassermann and A. Horsfield, J. Chem. Soc., Chem. Commun., 1972, 294 DOI: 10.1039/C39720000294
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