Abstract
The synthesis and structural characterization of new metal(II) chelates (M = CoII, NiII, CuII and ZnII) of neutral conjugated bidentate β-diketone ligands, having no enolisable γ-carbon proton, and their reactions are reported. The ligand systems chosen are Knoevenagal condensates of aromatic aldehydes with β-diketones, such as 3-(benzylidene/salicylidene) acetylacetone/benzoylacetone. The general composition of the chelates is [M(AA)B2C2] for 6-coordinate complexes and [M(AA)B2] for 4-coordinate complexes. (AA) is a neutral bidentate aldehyde-β-diketone condensate ligand; B is a mono-dentate anion and C is monodentate neutral ligand (H2O/Py). Bromination at α-methyl groups by NBS and PyHBr3, Schiff base condensation at β-carbonyl groups by amine bases and 1,2-addition reaction at the γ-carbon double bond are reported.
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