Gold and nickel bisdithiolene complexes with methyl and -butyl substituted thiophenetetrathiafulavalenedithiolate ligands (α-mtdt and α-tbtdt) were prepared and characterized. These complexes were obtained, under anaerobic conditions, as tetrabutylammonium salts. The diamagnetic gold monoanion (-Bu₄N)[Au(α-mtdt)₂] () and nickel dianionic species (-Bu₄N)[Ni(α-mtdt)₂] (x = 1,2) () were similar to the related non-substituted extended thiophenic-TTF (TTF = tetrathiafulvalene) bisdithiolenes. However the introduction of the large, bulky substituent -butyl, led to the formation of a Au (I) dinuclear complex, (-Bu₄N)₂[Au₂(α-tbtdt)₂] (). The neutral methyl substituted gold and nickel complexes were easily obtained through air or iodine exposure as polycrystalline or amorphous fine powder. [Au(α-mtdt)₂] () and [Ni(α-mtdt)₂] () polycrystalline samples display properties of a metallic system with a room temperature electrical conductivity of 0.32 S/cm and ≈4 S/cm and a thermoelectric power of ≈5 µV/K and ≈32 µV/K, respectively. While [Au(α-mtdt)₂] () presented a Pauli-like magnetic susceptibility typical of conducting systems, in [Ni(α-mtdt)₂] () large magnetic susceptibilities indicative of high spin states were observed. Both electric transport properties and magnetic properties for gold and nickel [M(α-mtdt)₂] are indicative that these compounds are single component molecular conductors.
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| http://dx.doi.org/10.3390/molecules23020424 | DOI Listing |
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