Synthesis and X-ray structure of a new silver(I) coordination polymer assembled as one-dimensional chains

The symmetrical, bipodal ligand N',N',N'",N"'-tetraethyl-N,N''-pyridine-2,6-dicarbonyl-bis(thiourea) (tepytu) and silver(I) perchlorate yield a coordination polymer {[Ag-2(tepytu)(3)](ClO4)(2)}(n). The compound was characterized by electrospray mass spectrometry, as well as IR, H-1 and C-13 NMR spectroscopy. The structure of the coordination polymer has been determined by X-ray diffraction analysis. The tepytu ligands act as bidentate S,S-donors towards silver. Two silver ions and two tepytu molecules form a cyclic subunit, whereas the third tepytu of the formula unit links to the next [Ag(tepytu)(2)]-subunit by coordinating each of its thiocarbonyl sulfur atoms bridging towards both silver ions of one subunit. This results in an infinite one-dimensional chain leaving each silver ion coordinated in a highly distorted tetrahedral fashion. (C) 2000 Elsevier Science S.A. All rights reserved.