Potential tridentate salicylaldehyde hydrazone of arylalkanoic acid coordinate to copper(II) acting as dinegative tetradentate ligands

A chiral Schiff base N-(S)-2-(6-methoxylnaphthyl)-propanoyl-N′-(2-hydroxylbenzylidene)hydrazine (H2L) has been synthesized. Reaction of H2L with Cu(OAc)2 · H2O led to the formation of a metal complex {[CuL] · H2O · 2DMF}∞ (1). In complex 1, the potential dinegative tridentate L2− ligand acting as tetradentate bridging ligand coordinate to two metal ions so as to form a novel infinite metal–organic coordination chain structure. The enantiomerically pure ligand H2L presents two different sets of signals in the 1H NMR spectrum either in chloroform solution or in dimethylsulfoxide solution, showing the presence of both (E) and (Z) isomers. The X-ray structural investigations of H2L revealed that it is the fully extended E-configuration in the solid state.