Abstract
Silver(I) complexes of thioureas and thiocyanate, [(Tu)AgSCN], [(Metu)AgSCN], [(Dmtu)AgSCN], [(Tmtu)(AgSCN)
], [(Imt)AgSCN], and [(Diaz)AgSCN] (where Tu = thiourea, Metu =
-methylthiourea, Dmtu =
′-dimethylthiourea, Tmtu =
′,
′-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)] (
), was determined by X-ray crystallography. The crystal structure of
shows that the complex exists in the form of a chain-like polymer comprising [Ag(
-Diaz)(
-SCN)] units. The silver atoms are bridged by
-thione sulfur atoms of Diaz and
-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 >C=S resonance of thiones in
C NMR and a downfield shift in the N–H resonance in
H NMR are consistent with the sulfur coordination to silver(I). The appearance of a band around 2100 cm
in the IR and a resonance around 125 ppm in the
C NMR spectrum indicates the binding of thiocyanate to silver(I).