Abstract

The metal (CoII, CoIII, NiII, CuII, and PdII) complexes of thiosalicylohydrazide, H2L1[o-HOC6H4C(S)N1-R1N2R2R3, R1= R2= R3= H], and its derivatives H2L2(R1= H, R2= R3= Me), HL3(R1= Me, R2= R3= H), H2L4(R1= R2= H, R2= Ph), and HL5(R1= Ph, R2= R3= H) have been prepared and characterised. The compounds H2L1, H2L2, and H2L4 act as monobasic bidentate ligands {except in [Pd(HL4)2] where one ligand is bidentate and the other one is tridentate to form a five-co-ordinate neutral chelate} to form neutral chelates. Compounds HL3 and HL5 behave as both bi- and tri-dentate species and form four-co-ordinate cationic aquocobalt(II), aquo- and halogeno-copper(II), Zwitterionic palladium(II) chelates, and five-co-ordinate cationic halogenonickel(II) chelates. The chelating ligands show four types of co-ordination, i.e. N1O, N2S, OS, and N2OS. The structural relationships of the complexes are discussed.

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