Compounds of the type π-C5H5NiPBu3SC(S)X (X = R, OR and NRH) are obtained from reactions between [π-C5H5Ni(PBu3)2]+Cl− and SC(S)X− in aqueous solution. Compounds such as π-C5H5NiPBu3SC(S)NRH are also obtained by reactions of π-C5H5NiPBu3SH with RNCS.