Synthesis and structure characterization of three-coordinate silver(I) and seven-coordinate cobalt(II) coordination polymers with 4-pyridylthioacetate

The synthesis and self-assembly of Silver (I) and Cobalt (II) with the 4-pyridylthioacetate (pyta) ligand leads to two new coordination polymers, Ag(pyta) (1) and [Co(pyta)(2)H2O] (2). 1 is a three-connected silver coordination polymer, which consists of a wave layer and regular rectangle cavities (5.54 x 8.16 Angstrom). While 2 is constructed by fascinating assembly of pyta ligands with a new structure of seven-coordinate cobalt ions. The two-dimensional layers structure is based on four kinds of chiral helices viewed from a and b directions. The crystallographic parameters are as follows: for 1, monoclinic, space group P21/c, with a = 8.160(2) Angstrom, b = 10.109(2) Angstrom, c = 10.097(2) Angstrom, beta = 104.93degrees, and Z = 4; for 2, monoclinic, space group C2/c, a = 15.928(3) Angstrom, b = 6.3448(12) Angstrom, c = 15.582(3) Angstrom, beta = 94.698(3)degrees, and Z = 8. (C) 2003 Elsevier B.V. All rights reserved.