Synthesis and characterisation of thiolato Schiff base nickel(II) complexes. X-Ray structures of Ni(η5-C5H5)(PPh3)(SC6H4NCHC6H4Br-4′) and Ni(η5-C5H5)(PBu3)(SC6H4NCHC6H4CH3-4′)

Abstract

A series of complexes of formula Ni(η⁵-C₅H₅)(PR₃)(SC₆H₄NCHC₆H₄X-4′) (R = Ph, Bu; X = F, Cl, Br, CH₃, OH, H) has been isolated from the reactions of Ni(η⁵-C₅H₅)(PPh₃)Cl or the bromo derivative, the thiol Schiff base ligands, 4-HSC₆H₄NCHC₆H₄X-4′, and triethylamine. Preliminary thermal analysis data indicate that the PBu₃ complexes could exhibit liquid crystalline behaviour. Electrochemistry of the PPh₃ compounds gave irreversible redox couples, in contrast to the quasi-reversibility of the PBu₃ compounds.