Thiolates Schiff base complexes

Complex [Ni(468)] is formed with Ni11 salts and the amine-thiolate ligand, or by reduction of the corresponding Schiff base complex with NaBH4-[Ni(468)] is easily deprotonated to form the dianionic complex, which is subsequently oxidized to the monoanion. On the other hand, the dianionic complex reacts with CH3I to form the fourfold methylated octahedral complex (469).1305 Since without preceding deprotonation only the S-donors are methylated, the complex with twofold amine methyla-tion must be synthesized via protection and subsequent deprotection of the S-donors.1306... 

A series of Zr and Hf complexes supported by dianionic phenolate-thiolate Schiff-base ligands have been reported.825 827 836-840 While it is thought that these ligands give rise to O, N, S chelates, this has not been confirmed unambiguously. 

Condensation of ketones or aldehydes with the methyl ester of dithiocarbazic acid produces hgands with S,N,0 or S,N donor sets. An example is (142), which acts as both a didentate and a tridentate to ReO. Nickel(II)-templated reactions of pentanedione or salicylaldehyde with aminoethanethiol produce N,0,S ligands such as (143) and (144) these form simple mononuclear complexes or else dinuclear species with thiolate bridging two Ni centers. Mixed donor Schiff-base hgands including other heteroatoms such as P (145) and Te (146) have appeared. 

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