Dimethylsulfoxide gold-thallium complexes. Effects of the metal-metal interactions in the luminescence

摘要

The heteropolynuclear complexes [AuTl(C6X5)(2)](n) (X = F, Cl) react with dimethylsulfoxide (DMSO) in different molar ratios leading to products of stoichiometry [Tl-2{Au(C6F5)(2)}(2){mu-DMSO}(3)](n) (1), and [Tl-2{Au(C6Cl5)(2)}(2){mu-DMSO}(2)](n) (2). These complexes have been structurally characterized and can be viewed as extended linear chains built with Tl-Au-Tl units in which the thallium atoms are bridged by the oxygen atoms of DMSO ligands. Additional [Au(C6X5)(2)](-) fragments interact with one or two thallium centres, respectively, giving rise to two different types of metal-metal interactions in. each molecule. Both of them show a strong luminescence in solid state and complex 2 also in solution. The thallium-thallium interaction in this complex is considered to be the responsible of its luminescence, which remains in solution. (c) 2005 Elsevier B.V. All rights reserved.