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Gold Complexes with Dithiothiophene Ligands: A Metal Based on a Neutral Molecule
Author(s) -
Belo Dulce,
Alves Helena,
Branco Lopes Elsa,
Duarte Maria Teresa,
Gama Vasco,
Teives Henriques Rui,
Almeida Manuel,
PérezBenítez Aarón,
Rovira Concepció,
Veciana Jaume
Publication year - 2001
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20010119)7:2<511::aid-chem511>3.0.co;2-5
Subject(s) - diamagnetism , metal , paramagnetism , crystallography , chemistry , molecule , electrical resistivity and conductivity , physics , condensed matter physics , organic chemistry , magnetic field , quantum mechanics
The gold complexes n ‐Bu 4 N[Au( α ‐tpdt) 2 ] ( 5 ), n ‐Bu 4 N[Au(dtpdt) 2 ] ( 4 ) and n ‐Bu 4 N[Au(tpdt) 2 ] ( 6 ) based on new dithiothiophene ligands ( α ‐tpdt=2,3‐thiophenedithiolate, dtpdt=2,3‐dihydro‐5,6‐thiophenedithiolate and tpdt=3,4‐thiophenedithiolate) have been prepared and characterised. These gold( III ) complexes are diamagnetic, but they can be oxidised with iodine to the paramagnetic compounds [Au( α ‐tpdt) 2 ] ( 8 ), [Au(dtpdt) 2 ] ( 7 ) and n ‐Bu 4 N[{Au(tpdt) 2 } n ∼2 ] ( 9 ), which were isolated as fine powders and which exhibit paramagnetic susceptibilities that are almost temperature independent with room temperature values of 2.5×10 −4 , 2.0×10 −4 and 5×10 −4 emu mol −1 , respectively. Interestingly, the neutral complex [Au( α ‐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 μV K −1 ; this is the first time that this metallic property has been observed in a molecular system based on a neutral species.