engleski

Thermal Analysis and Spectral Characterisation of the 1:1 Complexes of Mercury(II) Halides and Pseudohalides with 3, 4, 5, 6-tetrahydropyrimidine-2-thione. Crystal Structures of Bis(3, 4, 5, 6-tetrahydropyrimidine-2-thione-S)mercury(II) Tetrachloro and Tetrabromomercurate(II)

Mercury(II) complexes of the type HgX_2(H_4pymtH) (X = Cl, Br, I, SCN, CN ; H_4pymtH = 3, 4, 5, 6-tetrahydropyrimidine-2-thione) have been obtained and structurally characterized by X-ray diffraction, IR, 1_H and 13_C NMR spectroscopy. Single crystal X-ray structure analysis was performed for the chloro and bromo complexes which were found to be isostructural. Their crystal structures consist of [Hg(H_4pymtH)_2]^2+ complex cations and [HgX_4]^2- complex anions interconnected by Hg×××X contacts into puckered sheets. The crystal structure of H_4pymtH has been redetermined to greater accuracy. In solution NMR spectra of complexes the greatest complexation effects were found on the 13^C chemical shift of the thioketo-carbon atom and on the 1^H chemical shift of the NH protons.

mercury(II) complexes; heterocyclic thiones; crystal structure; thermal analysis; 1^H and 13^C NMR spectra

nije evidentirano