One-dimensional coordination polymers:: Cu(II) and Zn(II) complexes of N-(2-pyridylmethyl)-glycine and N-(2-pyridylmethyl)-L-alanine

The crystal structures of three Cu(II) and one Zn(II) complexes of N-(2-pyridylmethyl)-L-glycine (Hpgly) and N-(2-pyridylmethyl)-L-alanine (Hpala) have been described. They are [Cu(pgly)Cl] - H2O (1), [Cu(pala)Cl] - H2O (2), [Cu(pala)(CH3COO)] - 0.75H(2)O (3), and [Zn(pgly)(NO3)] (4). All these compounds have 1D polymeric structures in the solid state. In 1 and 2, the chloride ions bridge [Cu(pgly)] and [Cu(pala)] fragments, respectively, to generate ID polymers while the bridging acetate ligands are responsible for the formation of Delta Delta Delta Delta type spiral polymers in 3. The nitrate ion in 4 is only acting as a terminal ligand while the carboxylate oxygen atom of the pala ligand bridges the Zn(II) centers to form the zigzag coordination polymeric chain. The ID coordination polymers in 1 and 2 have very similar arrangements although crystallized in different space groups, and host ID water chains in their crystal lattices. (c) 2006 Elsevier B.V. All rights reserved.