Charge-Transfer salts based on BET-TTF and the linear ions AuX₂⁻ (X = Br, I)

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• 作者：Rovira ; C. ; Veciana ; J. ; Tarré ; s ; J. ; Molins ; E. ; Mas ; M. ; Cowan ; D.O. ; Yang ; S.
• 刊名：Synthetic Metals
• 出版年：1995
• 出版时间：March 15, 1995
• 年：1995
• 卷：70
• 期：1-3
• 页码：883-886
• 全文大小：304 K

文摘

The organic π-electron donor E-bis(ethylenethio)-tetrathiafulvalene (BET-TTF) forms several charge-transfer salts with linear AuX₂⁻ (X = Br, I) counterions. Experimental conditions significantly affect the shape and the composition of the charge-transfer crystals. In fact, salts with different stoichiometries are obtained from each counterion. The magnetic behavior of the obtained salts have been studied by EPR spectroscopy. The EPR parameters (g, and ΔH_pp) of different mixed valence salts with the same counterion are very similar. The crystal structure of (BET-TIF)AuBr₂ has been determined by X-Ray diffraction: triclinic system, P-1, Z = l, a = 5.790(4)Å, b = 7.786(3)Å, c = 9.716(8)Å α = 75.11(5)°, β = 89.30(4)°, γ = 77.20(5)°, V = 395.5(5)ų. Single crystal electrical conductivity measurements of (BET-TTF)₂AuBr₂ show that this salt exhibits a semiconducting behavior with a σ(300) = 1.1 Scm⁻¹ and an energy gap of 0.14 eV.