SYNTHESIS OF TRIDENTATE LIGANDS BY CLEAVAGE OF 3.5-DIPHENYL-1.2-DITHIOLIUM SALTS WITH (THIO)BENZOYLHYDRAZINE OR 2-HYDROXY-5-METHYL-ANILINE - STRUCTURES OF THE CORRESPONDING NICKEL CHELATES

Tridentate ligands having the donor set S<^>N<^>O(S) were synthesized by cleavage of 3.5-diphenyl-1.2-dithiolium salts with (thio)benzoylhyd razine or 2-hydroxy-5-methylaniline. The ligands were characterized as their nickel chelates formed in the presence of triphenylphosphane. T he same nickel compounds result by template reactions of dithiolium sa lt, nickel acetate and the corresponding amine component. Crystal stru ctures were determined for thiodibenzoylmethane benzoylhydrazone 1a, [ thiodibenzoyl-methane oylhydrazonatom(2-)]-triphenylphosphane-nickel(I I) 1b, [thiodibenzoylmethane obenzoylhydrazonato(2-)]-triphenylphospha ne-nickel (II) 2b and [thiodibenzoylmethane 5-methyl-anilato(2-)]triph enylphosphane-nickel(II) ethanol 3.