Synthesis, crystal structure and magnetic properties of bis(3,4;3′,4′-ethylenedithio)2,2′,5,5′-tetrathiafulvalene-bis(cyanoimidodithiocarbonate)aurate(III), (bedt-ttf)[

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• 作者：Dulce Belo ; Cé ; sar Rodrigues ; Isabel C. Santos ; Susana Silva ; Teresa Eusé ; bio ; Elsa B. Lopes ; Joã ; o V. Rodrigues ; Manuel J. Matos ; Manuel Almeida ; M. Teresa Duarte and Rui T. Henriques
• 关键词：Bedt-ttf ; EPR radicals ; Gold bisdithiolate ; Magnetic susceptibility
• 刊名：Polyhedron
• 出版年：2006
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：27 March 2006
• 卷：25
• 期：5
• 页码：1209-1214
• 文件大小：293 K

摘要

The new compound, (bedt-ttf)[Au(cdc)₂], where bedt-ttf stands for bis(3,4;3′,4′-ethylenedithio)2,2′,5,5′-tetrathiafulvalene(+) and cdc for cyanoimidodithiocarbonate(2−), was synthesised. Its structure is monoclinic, space group P2₁/n, with cell parameters a = 6.9031(8) , b = 21.3213(16) , c = 7.9833(9) , β = 91.643(6)°, V = 1174.5(2) ³ and Z = 2 and consists of alternated stacking of donor and acceptor moieties along c. This compound is a semiconductor with a room temperature resistivity of 6.5 × 10³ Ω cm and an energy gap 2Δ = 0.51 eV. The anisotropy and thermal dependence of the ESR signal, only due to the bedt-ttf cations, was studied in the range 4–300 K. The static and EPR spin susceptibilities indicate an almost temperature independent value of 2.5 × 10⁻⁴ emu/mol ascribed to a three-dimensional network of antiferromagnetic interactions.