Preparation, infrared, Raman and N.M.R. spectra of N,N′‐Diethylthiourea complexes with zinc(II), cadmium(II) and mercury(II) halides

Several complexes of N,N′‐diethylthiourea (Dietu) with zinc(II), cadmium(II) and mercury(II) halides were prepared and characterized by i.r. (4000–60 cm −1 ), raman (400–60 cm −1 ), in the solid state and n.m.r. and conductometric methods in solution. The complexes Zn(Dietu) 2 X 2 , Cd(Dietu) 2 X 2 (X Cl, Br, I) and Hg(Dietu) 2 X 2 (X Br, I) are tetrahedral species in which intramolecular NH … X interactions have been observed. The 1:1 mercury(II) complexes, Hg(Dietu)X 2 (X Cl, Br), appear to have a dimeric tetrahedral halide‐bridged structure in the solid state. In all these complexes N,N′‐diethylthiourea is sulphur‐bonded to the metal.