Tetranuclear heteroleptic mercury(ii) complexes of the composition [Hg-4(S2CNPr2)(6)(NO3)(2)] and [Hg-4(S2CNPr2)(4)Cl-4]: structural organization, principles of construction of supramolecular polymeric chains, and thermal behavior

摘要

New heteroleptic mercury(ii) complexes [Hg-4(S2CNPr2)(6)(NO3)(2)] (1) and [Hg-4(S2CNPr2)(4)Cl-4] (2) were synthesized and characterized by single-crystal X-ray dif raction and C-13 and N-15 MAS NMR spectroscopy. In these complexes, the metal atoms are linked in pairs by bridging dipropyldithiocarbamate ligands (Pr(2)Dtc) to form tetranuclear cations and molecules. The further structural organization of compound 1 to the polymeric chains [Hg-4(S2CNPr2)(6)(NO3)(2)](n) occurs due to the linking of [Hg-4(S2CNPr2)(6)](2+) cations by pairs of bridging nitrate groups. The formation of the supramolecular polymeric structure of 2 is determined by pairwise secondary HgCl bonds between the cyclic [Hg-4(S2CNPr2)(4)Cl-4] molecules, in which the central eight-membered metallocycle [Hg4S4] adopts a distorted chair conformation. The thermal behavior of compounds 1 and 2 was studied by simultaneous thermal analysis.