Gold complexes with dithiothiophene ligands: A metal based on a neutral molecule

resumo

The gold complexes n-Bu4N-[Au(alpha -tpdt)(2)] (5), n-Bu4N[Au(tpdt)(2)] (4) and n-Bu4N[Au(tpdt)(2)] (6) based on new dithiothiophene ligands (alpha -tpdt= 2,3-thiophenedithiolate, dtpdt = 2,3-dihydro-5,6-thiophenedithiolate and tpdt = 3,4-thiophenedithiolate) nave been prepared and characterised. These gold(III) complexes are diamagnetic, but they can be oxidised with iodine to the ;paramagnetic compounds [Au(alpha -tpdt)(2)] (8), [Au(dtpdt)(2)] (7) and n-Bu4N-[{Au(tpdt)(2)}(n similar to2)] (9), which were isolated as fine powders and which exhibit para-magnetic susceptibilities that are almost temperature independent with room temperature values of 2.5 x 10(-4), 2.0 x 10(-4) and 5 x 10(-4) emu mol(-1), respectively. Interestingly, the neutral complex [Au(alpha -tpdt)(2)] (8) as a polycrystalline sample displays the properties of a metallic system with a room temperature electrical conductivity of 6 S cm(-1) and a thermoelectric power of 5.5 mu VK-1; this is the first time that this metallic property has been observed in a molecular system based on a neutral species.

palavras-chave

BIS(ETHYLENETHIO)TETRATHIAFULVALENE BET-TTF; CONDUCTION ELECTRONS; PHYSICAL-PROPERTIES; SPIN-LADDER; CRYSTAL; FAMILY; SALTS; THERMOPOWER; ROUTE; FE

categoria

Chemistry

autores

Belo, D; Alves, H; Lopes, EB; Duarte, MT; Gama, V; Henriques, RT; Almeida, M; Perez-Benitez, A; Rovira, C; Veciana, J

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