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      Synthesis and crystal structure of chalcogenide cluster compound

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          Abstract

          Three new cluster compounds were synthesized from Hg(EPh)2 (E = Se, Te; Ph = phenyl) in organic solvents. Two of these compounds, [Hg2Cl2(SePh)2(PCy3)2], (1), and [Hg2Br2(SePh)2(PCy3)2], (2), were prepared by reaction of Hg(SePh)2, HgX2 (X = Cl, Br) and tricyclohexylphosphine, PCy3, in dimethylformamide. The reaction of Hg(TePh)2 with HgBr2 in tetrahydrofuran using triphenylphosphine or 2,2’-bipyridine as co-ligands gave the polymeric cluster [{Hg5Br3(TePh)7}n] (3), whose dissolution in dimethylsulfoxide yielded the cluster [Hg3Br3(TePh)3]·2dmso. The influence of different ligands, coordinating solvents and reaction stoichiometries on the formation of the title compounds is also discussed. All complexes were characterized by elemental analysis, thermogravimetric analysis and single crystal X-ray diffractometry.

          Translated abstract

          Três novos compostos foram preparados a partir de Hg(EPh)2 (E = Se, Te; Ph = fenila) em solventes orgânicos. Dois destes compostos são clusters moleculares, [Hg2Cl2(SePh)2(PCy3)2], (1), e [Hg2Br2(SePh)2(PCy3)2], (2), obtidos pela reação de Hg(SePh)2 com HgX2 (X = Cl, Br) e tricicloexilfosfina, PCy3, em dimetilformamida. A reação de Hg(TePh)2 e HgBr2 em tetrahidrofurano usando trifenilfosfina ou 2,2’-bipiridina como co-ligantes produz o cluster polimérico [{Hg5Br3(TePh)7}n], (3), cuja dissolução em dimetilsulfóxido leva à formação do cluster [Hg3Br3(TePh)3]·2dmso. Neste trabalho avalia-se a influência de diferentes ligantes, solventes coordenantes e estequiometrias de reações na formação dos produtos. Todos os compostos foram caracterizados por análise elementar, análise termogravimétrica e tiveram suas estruturas cristalinas determinadas por difratometria de raios X em monocristais.

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          Allylsilanes and vinylsilanes from silylcupration of carbon-carbon multiple bonds: scope and synthetic applications.

          Silylcupration of multiple bonds (allenes, acetylenes, dienes, and styrenes) has become one of the most efficient procedures for the synthesis of vinyl- and allylsilanes. These substrates are useful building blocks in organic synthesis since they undergo a great variety of silicon-assisted transformations. The methodology reported has been widely used in the synthesis of different natural products, as well as in the construction of carbo- and heterocycles. In this Account, we wish to illustrate our contribution to this field, as well as to highlight the contributions of others.
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            Lehrbuch der algemeinen Chemie

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              Author and article information

              Journal
              jbchs
              Journal of the Brazilian Chemical Society
              J. Braz. Chem. Soc.
              Sociedade Brasileira de Química (São Paulo, SP, Brazil )
              0103-5053
              1678-4790
              2010
              : 21
              : 7
              : 1230-1236
              Affiliations
              [01] Santa Maria RS orgnameUniversidade Federal de Santa Maria orgdiv1Departamento de Química Brazil
              [02] Santa Maria RS orgnameUniversidade Federal de Santa Maria orgdiv1Departamento de Física Brazil
              Article
              S0103-50532010000700010 S0103-5053(10)02100710
              10.1590/S0103-50532010000700010
              b3d48db9-b59f-4b5a-8fba-02c7dbbe9457

              This work is licensed under a Creative Commons Attribution 4.0 International License.

              History
              : 12 September 2009
              : 22 March 2010
              Page count
              Figures: 0, Tables: 0, Equations: 0, References: 37, Pages: 7
              Product

              SciELO Brazil

              Self URI: Full text available only in PDF format (EN)
              Categories
              Articles

              clusters,mercury(II) complexes,selenium,tellurium
              clusters, mercury(II) complexes, selenium, tellurium

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