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Synthesis and thermal transformations of molecular complexes of bis[tris(trifluoromethyl)germyl]mercury(ii witho-quinones

Research paper by G. A. Abakumov, V. K. Cherkasov, N. I. Ermolaev, V. I. Nevodchikov, L. G. Abakumova

Indexed on: 01 Aug '95Published on: 01 Aug '95Published in: Russian Chemical Bulletin



Abstract

Stable molecular complexes of bis[tris(trifluoromethyl)germyl]mercury(II) Hg[(CF3)3Ge]2 (1) witho-quinones (3,6-di-tert-butylbenzoquinone-1,2 (2), 3,6-di-tert-butyl-4,5-dimethoxybenzoquinone-1,2 (3), and 1,4,5,7-tetra-tert-butyldibenzo[1,4]dioxin-2,3-dione (4)) have been synthesized and characterized by elemental analysis and IR and electronic absorption spectroscopies. Depending on the ratio between the starting reactants, the reactions ofo-quinones with1 gave complexes of the composition R2Hg · Q (5,7,9) or R2Hg · Q2 (6,8,10), where Q=2 (5,6),3 (7,8),4 (9,10); R=Ge(CF3)3. According to the spectral data, the molecule ofo-quinone in R2Hg · Q acts as a neutral ligand, whereas the second molecule ofo-quinone in R2Hg · Q2 is not coordinated to1. It has been found by ESR that thermolysis of polycrystalline samples of complexes6 and10 involves intermediate formation of radical pairs and finally yields paramagnetico-semiquinone complexes, SQGe(CF3)3, which are typical products of one-electron oxidation of Organometallic compounds byo-quinones.