Gold and Nickel Extended Thiophenic-TTF Bisdithiolene Complexes
AbstractGold and nickel bisdithiolene complexes with methyl and tert-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 (n-Bu4N)[Au(α-mtdt)2] (3) and nickel dianionic species (n-Bu4N)x[Ni(α-mtdt)2] (x = 1,2) (4) were similar to the related non-substituted extended thiophenic-TTF (TTF = tetrathiafulvalene) bisdithiolenes. However the introduction of the large, bulky substituent tert-butyl, led to the formation of a Au (I) dinuclear complex, (n-Bu4N)2[Au2(α-tbtdt)2] (5). 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] (6) and [Ni(α-mtdt)2] (7) 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] (6) presented a Pauli-like magnetic susceptibility typical of conducting systems, in [Ni(α-mtdt)2] (7) 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. View Full-Text
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Silva, R.A.L.; Vieira, B.J.C.; Andrade, M.M.; Santos, I.C.; Rabaça, S.; Lopes, E.B.; Coutinho, J.T.; Pereira, L.C.J.; Almeida, M.; Belo, D. Gold and Nickel Extended Thiophenic-TTF Bisdithiolene Complexes. Molecules 2018, 23, 424.
Silva RAL, Vieira BJC, Andrade MM, Santos IC, Rabaça S, Lopes EB, Coutinho JT, Pereira LCJ, Almeida M, Belo D. Gold and Nickel Extended Thiophenic-TTF Bisdithiolene Complexes. Molecules. 2018; 23(2):424.Chicago/Turabian Style
Silva, Rafaela A.L.; Vieira, Bruno J.C.; Andrade, Marta M.; Santos, Isabel C.; Rabaça, Sandra; Lopes, Elsa B.; Coutinho, Joana T.; Pereira, Laura C.J.; Almeida, Manuel; Belo, Dulce. 2018. "Gold and Nickel Extended Thiophenic-TTF Bisdithiolene Complexes." Molecules 23, no. 2: 424.
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