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2-mercaptonicotinic acid (H2mna = 2-HS(C5H3N)COOH) gave a thiolato compound of the formulaHg(Hmna)2 by a reaction with various mercury(II) salts, HgX2 (X = Cl−, Br−, I−, SCN−) in an ethanolor methanol solution irrespectively of the molar ratio of the reactants (1:1 or 1:2). The same compoundwas obtained from the reaction of mercury(II) acetate in an aqueous-ethanol solution. Hg(Hmna)2 wascharacterized by vibrational spectroscopy and thermal analysis. 1H and 13C NMR measurements providedadditional information on the thiol-thione tautomerism in H2mna and Hg(Hmna)2 and also on the bindingmode to mercury in the DMSO-d6 solution. HgBr2(CH3-Hmna)2 was obtained from the reaction of H2mnawith HgBr2 in methanol after filtering off the main product Hg(Hmna)2 (CH3-Hmna = 2-HS(C5H3N)COOCH3). The crystal structures of H2mna and HgBr2(CH3-Hmna)2 were determined by theX-ray structure analysis. 2-mercaptonicotinic acid exists in the crystalline state in the thione tautomericform. Two bromine atoms and two S-bound CH3-Hmna ligands form a tetrahedral coordination spherearound the mercury atom in HgBr2(CH3-Hmna)2.(doi: 10.5562/cca2169

croatica chemica acta

Synthesis, Spectral and Thermal Characterization of Bis(pyridine-3- carboxy-2-thiolato-S)mercury(II). Crystal Structure of Dibromobis(3- metoxycarbonylpyridine-2-thiolato-S)mercury(II)