Hydrothermal Synthesis and Structure of Coordination Polymers by Combination of Bipyrazole and Aromatic Dicarboxylate Ligands

Abstract

Nine new coordination polymers, namely 2∞[Ag(Hp2CA)(Me4bpz)] (I), 3∞[Zn2(p2CA)2(Me4bpz)] (II), 2∞[Cd(OAc)2(Me4bpz)(H2O)] (III), 1∞[Ag2(m2CA)(Me4bpz)2] (IV), 3∞[Zn(m2CA)(Me4bpz)] (V), 2∞[Cd(m2CA)(Me4bpz)]·H2O (VI), 1∞[Ag(OAc)(Me4bpz)2]·5.4 H2O (VII), 3∞[Zn2(OHm2CA)2(Me4bpz)2]·1.75 H2O (VIII), and 2∞[Cd(OHm2CA)(Me4bpz)(H2O)] (IX) [Hp2CA, terephthalic acid monoanion; p2CA, terephthalic acid dianion; OAc, acetate; m2CA, isophthalic acid dianion; OHm2CA, 5-hydroxy-isophthalic acid dianion; Me4bpz, 3,3′,5,5′-tetramethyl-4,4′-bipyrazole], were obtained from acetate hydrates of Ag+, Zn2+, and Cd2+ and mixed ligand systems consisting of Me4bpz and the respective aromatic dicarboxylic acid by means of hydrothermal synthesis. The compounds were characterized by means of X-ray single-crystal structure analysis, elemental analysis, and IR spectroscopy. The topologies realized in these coordination polymers vary from simple one-dimensional polymers to complex three-dimensional frameworks. Hydrogen bonds of different types with influence on the resulting structures are observed in all compounds