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Molecular compounds of HgCl 2  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 K 2 HgCl 4  • H 2 O and Rb 2 HgCl 4  • H 2 O were studied by  35 Cl 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  35 Cl NQR results, HgCl 2  may form dimers and trimers with orthochlorobenzaldehyde and parachlorobenzaldehyde, respectively. Isotypy of K 2 HgCl 4  • H 2 O and Rb 2 HgCl 4  • H 2 O is in accordance with the NQR experiments.

Molecular Compounds of HgCl 2 with Organic Donors. A 35 Cl NQR Study