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Silver(I) complexes of thioureas and thiocyanate, [(Tu)AgSCN], [(Metu)AgSCN], [(Dmtu)AgSCN], [(Tmtu)(AgSCN) 1.5 ], [(Imt)AgSCN], and [(Diaz)AgSCN] (where Tu = thiourea, Metu =  N -methylthiourea, Dmtu =  N , N ′-dimethylthiourea, Tmtu =  N , N , N ′, N ′-tetramethylthiourea, Imt = 1,3-imidazolidine-2-thione, and Diaz = 1,3-diazinane-2-thione), have been prepared and characterized by elemental analysis, IR and NMR spectroscopy, and thermal analysis. The crystal structure of one of them, [(Diaz)Ag(SCN)] ( 1 ), was determined by X-ray crystallography. The crystal structure of  1  shows that the complex exists in the form of a chain-like polymer comprising [Ag( μ  2 -Diaz)( μ  2 -SCN)] units. The silver atoms are bridged by  μ  2 -thione sulfur atoms of Diaz and  μ  2 -thiocyanate sulfur atoms. Thereby each silver atom adopts a distorted tetrahedral coordination environment comprising four sulfur atoms, two from thione and two from thiocyanate ligands. An upfield shift in the &gt;C=S resonance of thiones in  13 C NMR and a downfield shift in the N–H resonance in  1 H NMR are consistent with the sulfur coordination to silver(I). The appearance of a band around 2100 cm –1  in the IR and a resonance around 125 ppm in the  13 C NMR spectrum indicates the binding of thiocyanate to silver(I).

zeitschrift für naturforschung b

Synthesis and characterization of silver(I) complexes of thioureas and thiocyanate: crystal structure of polymeric (1,3-diazinane-2-thione)thiocyanato silver(I)