Investigating the effect of anion substitutions on the structure of silver-based coordination polymers

Abstract

Five silver(I) compounds namely, [Ag(tdmpp)(NO3)]n (1), [Ag2(SeCN)2(tdmpp)]n (2), [Ag(tdmpp)]PF6 (3), [WS4Ag3Cl (tdmpp)1.5]·2CH3CN (4) and [WS4Ag4I2(tdmpp)]1.5CH3CN (5) were prepared by the reactions of 1,1,3,3-tetrakis(3,5-dimethyl-1-pyrazolyl)propane (tdmpp) with various silver(I) salts in order to investigate the impact of the variation of the inorganic anions on the structure of these complexes. In the chain structures of 1 and 2, each tdmpp ligand acts as a bridge between a pair of adjacent silver(I) centers. In the structure of 1, the nitrate ion act as a terminal, monodentate ligand, while in compound 2 the SeCN anion functions as bidentate-bridging ligand between two neighboring Ag(I) centers. The parallel adjacent chains in 1 and 2 are linked together by means of non-covalent interactions to generate two-dimensional structures. In contrast to the distorted AgN4O square-pyramidal structure of 1, in the structure of 2 each of the silver ions possesses a distorted tetrahedral with an AgN3Se coordination geometry. Crystals of compounds 3-5 were not suitable for X-ray diffraction studies. © 2015 Elsevier B.V. All rights reserved.