1H,13C and199Hg NMR Studies of the Complexation of HgCl2by Imidazolidine-2-Thione and its Derivatives

Mercury(II) complexes of imidazolidine-2-thione and its derivatives have been synthesized and their 1H, 13C and 199Hg NMR spectra measured. HgCl2 forms L2HgCl2 type complexes (where L = imidazolidine-2-thione and its derivatives). The NH group of the ligand is shifted downfield by about +1.37 ppm in the 1H NMR after complexation. The C-2 carbon in the 13C NMR is shifted by—6.50 ppm for mono N-substituted ligands, but by—5.30 ppm for N,N''-disubstituted ligands. The 199Hg NMR resonance is shifted by about—60 ppm for N-substituted ligands, but—140 ppm shifts were observed for N',N'-disubstituted ligands.