Influence of organic carboxylic acids on self-assembly of silver(I) complexes containing 1,2-bis(4-pyridyl)ethane ligands

Abstract

Four silver(I) complexes, namely [Ag2(bpe)2](bdc)·8H2O (1), [Ag2(bpe)2(da)]·4H2O (2), [Ag4(bpe)3(bptc)]·9H2O (3), and Ag(bpe)2(bpdc)2 (4), have been successfully synthesized by the reactions between AgNO3, 1,2-bis(4-pyridyl)ethane (bpe) and different carboxylic acids, including 1,3-benzenedicarboxylic acid (H2bdc), diphenic acid (H2da), 3,3′,4,4′-biphenyltetracarboxylic acid (H4bptc), and 2,2′-bipyridine-3,3′-dicarboxylic acid (H2bpdc). All four compounds were characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. In (1), the Ag(I) atoms, in linear geometry, are joined into 1-D infinite cationic bpe-silver chains, and discrete bdc2− anions compensate the charge of the crystal structure. In (2), the Ag(I) atoms, adopting tetrahedral and trigonal geometries, are linked by bpe and da2− ligands into neutral double chains. In (3), the Ag(I) atoms, in T-shaped and linear environments, are coordinated by bpe and multidentate bptc4− ligands to construct a 2-D network. And in (4), the Ag(I) atoms, with trigonal and T-shaped coordination geometries, are coordinated by bpe and bpdc2− ligands to build up a 3-D framework. The different anions play different and important roles in directing the final crystal structures.