Dinuclear vanadium, copper, manganese and titanium complexes containing O, O, N-dichelating ligands: Synthesis, crystal structure and catalytic activity
Abstract O, O, N-or O, N-dichelating ligands, H 4 L 1, H 4 L 2, derived from new bis (hydroxybenzylidene)-substituted terephthalo and oxalo hydrazides were prepared and characterized by FT-IR and NMR spectroscopy (H 4 L 1= dicondensation of salicylaldehyde and terephthalic acid dihydrazide, H 4 L 2= dicondensation of salicylaldehyde and oxalic acid dihydrazide).[{VO 2} 2 (H 2 L 1)](1),[{Cu (CH 3 OH)} 2 (L 1)](2),[{Mn (CH 3 OH)} 2 (L 1) ...