Syntheses and structural characterization of three coordination polymers of Cd(II), Zn(II) and Pb(II) with the “V” shape ligand 4,4′-[isopropylidenebis( p-phenyleneoxy)]diacetic acid

Abstract

Three new inorganic–organic coordination polymers based on a “V” shape linking unit 4,4′-[isopropylidenebis( p-phenyleneoxy)]diacetic acid (H 2 L) and Cd II, Zn II and Pb II ions, [Cd( L)(H 2O) 2] n ( 1), [Zn 2( L) 3(H 2O) 6·6H 2O] n ( 2) and [Pb 2Na 2(L) 3(DMF) 4(H 2O) 2·2H 2O] n ( 3), have been prepared and structurally characterized by single-crystal X-ray diffraction analysis. Complex 1 is a 1D zig-zag chain coordination polymer, which is connected by strong hydrogen-bond interactions to result in a 3D network. In complex 2, an infinite 2D (6, 3) network with large hexagonal cavities was created. The whole 2D structure is a noninterpenetrating framework stacked by hydrogen-bonding interactions. Complex 3 is a novel 3D heterometallic coordination polymer, which possesses three different types of isolated channels.