Synthesis of a novel binucleating symmetrical mu-bis(tetradentate) Schiff base ligant based on pentan-2,4-dione, 2-hydroxybenzaldehyde and 1,4,7,10-tetraazadecane: A new family of dicopper (II/II) complexes

The new acyclic binucleating ligand H3L has been synthesized from a differe nt type of Schiff base condensation reaction of acetylacetone, salicylaldeh yde and triethylenetetramine The ligand has been characterized by H-1 and C -13 NMR, IR and FAB mass spectra. A family of binuclear Cu(II)-Cu(II) compl exes of this diimine ligand containing imidazolidine backbone and other sup porting exogenous bridges have been synthesized and characterized by elemen tal analysis, IR, UV-vis, EPR spectral, and magnetic studies. The complexes of general formula [Cu-2(mu -X)(mu -L)]. 2H(2)O (X=OAc, OMe, Oft) are obta ined by stoichiometric reaction of the ligand, CuCl2. 4H(2)O or Cu(OAc)(2). H2O and NaX in aqueous-methanol The ligand reacts with Cu(CH3CO2)(2).H2O in aqueous methanol in air at ambient temperature affording crystalline [Cu-2 (mu -OAC)(mu -L)]. 2H(2)O in excellent yields. The complexes have two CuN2O 3 coordination spheres bridged by one exogenous ligand. They represent a ne w family of imidazolidine bridged dicopper(II/II) complexes in unsymmetrica l compartments of a novel mu -bis(tetradentate) ligand (H3L).