Syntheses, thermal analyses, crystal structures and antimicrobial properties of silver(I)-saccharinate complexes with diverse diamine ligands

Five new silver(I)-saccharinate complexes [Ag-2(sac)(2)(tmen)(2)] (1), [Ag-2(sac)(2)(deten)(2)] (2), [Ag-2(sac)(2)(dmen)(2)] (3), [Ag(sac)(N,N-eten)] (4), and [Ag(sac)(dmpen)](n) (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(1)/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 center dot center dot center dot 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 center dot center dot center dot 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 center dot center dot center dot O hydrogen bonds, which produce a chain of edge-fused R-4(4)(16) and R-2(2)(12) rings along [1 0 0]. Complex 5 is a coordination polymer in which the monomeric [Ag(dmpen)(sac)](n) units are linked by Ag center dot center dot center dot 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. (C) 2010 Elsevier B. V. All rights reserved.