Syntheses, Thermal Analyses, Crystal Structures and Antimicrobial Properties of Silver(I)-Saccharinate Complexes with Diverse Diamine Ligands

Abstract

Five new silver(I)-saccharinate complexes [Ag<inf>2</inf>(sac)<inf>2</inf>(tmen)<inf>2</inf>] (1), [Ag<inf>2</inf>(sac)<inf>2</inf>(deten)<inf>2</inf>] (2), [Ag<inf>2</inf>(sac)<inf>2</inf>(dmen)<inf>2</inf>] (3), [Ag(sac)(N,N-eten)] (4), and [Ag(sac)(dmpen)]<inf>n</inf> (5); (sac = saccharinate, tmen = N,N,N′,N′-tetramethylethylenediamine, deten = N,N′-diethylethylenediamine, dmen = N,N′-dimethylethylenediamine, N,N-eten = N,N-diethylethylenediamine and dmpen = 1,3-diamino-2,2-dimethylpropan) have been synthesized and characterized by elemental analyses, IR, thermal analyses, single crystal X-ray diffraction and antimicrobial activities. The crystallographic analyses show that all the complexes crystallize in monoclinic space group P2<inf>1</inf>/c. In 1, the sac ligand acts as a bridge to connect the silver centres through its imino N and carbonyl O atoms forming an eight-membered bimetallic ring in a chair conformation. Complex 2 has also a dimeric structure in which the monomeric [Ag(sac)(deten)] units are linked by Ag⋯Ag interactions. In 3, saccharinate ligand acts as a bridging bidentate ligand between two silver(I) centres through sulfonyl group and imino N atom, forming an alternating polymeric chain through the direction [0 1 0]. In 4, the inter-molecular N-H⋯O hydrogen bonds form one-dimensional polymeric chains through the a axis, and these linear chains are inter-connected to each other by N-H⋯O hydrogen bonds, which produce a chain of edge-fused R<inf>4</inf>4 (16) and R<inf>2</inf>2 (12) rings along [1 0 0]. Complex 5 is a coordination polymer in which the monomeric [Ag(dmpen)(sac)]<inf>n</inf> units are linked by Ag⋯Ag interactions, and the dmpen ligand acts as a bridge between the silver(I) ions, forming a two-dimensional network parallel to the (1 0 0) plane. © 2010 Elsevier B.V. All rights reserved.