Abstract
Silver(I) complexes of thiourea (TU), selenourea (SeU), N,N-dimethyl selenourea (DMSeU) have been prepared. These complexes have been characterized by elemental analysis and NMR (H-1, C-13, Se-77 and Ag-109) spectroscopy. On complexation, an up field shift in > C=S and > C=Se resonances of thiones and selenones in C-13 NMR and low-field shifts Se-77 NMR are consistent with the sulfur and selenium coordination to metal ion. The principal components of the Se-77 shielding tensors were determined from solid-state NMR data of Ag-DMSeU complexes. The solid state C-13 NMR for various 1:1,1:2, 1:3 and 1:4 ratio of Ag(I): TU indicate that TU prefers to bind to Ag( I) only in 1:1 and 1:4 ratios and other are mixture of these two ratios.