Supramolecular Architectures of Four New Transition Metal Complexes with 3-[4-(Carboxymethoxy)phenyl]propanoic Acid and N-[4-(Carboxymethoxy)phenyl]iminodiacetic Acid

Four new transition metal complexes: [Cu(Hcppa)(2)(H2O)(2)] (1), [Co-2(cppa)(2)(H2O)(10)] (2), [Co-3(cpia)(2)(H2O)(8)]center dot 2H(2)O (3) and [Ni-3(cpia)(2)(H2O)(12)]center dot 6H(2)O (4) {H(2)cppa = 3-(4-(carboxymethoxy)phenyl] propanoic acid; H(3)cpia = N-[4-(carboxymethoxy)phenyl]iminodiacetic acid} were synthesized and characterized. Complexes 1 and 2 show mononuclear structures, complexes 3 and 4 exhibit dinuclear structures. All complexes extend to 3D supramolecular networks through hydrogen bonds, of which complexes 3 and 4 display microporous structures. In complexes 2-4 the water clusters are trapped by the cooperative association of coordinate interactions as well as hydrogen bonds, forming different 1D metal-water chain structures. Thermal stabilities of complexes 1-4 were discussed.