Molecular Compounds of HgCl2 with Organic Donors. A 35Cl NQR Study

Abstract

Molecular compounds of HgCl2 with organic donor molecules (dioxane, 1,3,5-trioxane, 1,3,5-trithiane, tetrahydrothiophene, 1,4-cyclohexandione, collidine, benzaldehyde, orthochlorobenzaldehyde, metachlorobenzaldehyde, parachlorobenzaldehyde) and the double salts K2HgCl4 • H2O and Rb2HgCl4 • H2O were studied by 35Cl NQR spectroscopy in the temperature range 77 K ≦ T ⪅ 300 K. The results are discussed with respect to the coordination around the Hg atom within the complex. The molecular compound, except those with sulfur-containing donors, seem to adapt an approximately octahedral coordination at the Hg atom. According to the 35Cl NQR results, HgCl2 may form dimers and trimers with orthochlorobenzaldehyde and parachlorobenzaldehyde, respectively. Isotypy of K2HgCl4 • H2O and Rb2HgCl4 • H2O is in accordance with the NQR experiments.