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Article Dans Une Revue Journal of Materials Chemistry C Année : 2021

Mixed-valence gold bis(diselenolene) complex turning metallic under pressure

Résumé

While oxidation of d(8) anionic gold bis(dithiolene) complexes most often affords the corresponding neutral radical single-component conductor, an original gold bis(diselenolene) complex isolated as a Ph4P+ salt affords upon electrocrystallization a mixed-valence 1 : 2 salt, [Ph4P][Au(Me-thiazds)(2)](2) (Me-thiazds: 2-methyl-1,3-thiazoline-2-thione-4,5-diselenolate). This salt exhibits a rare charge alternation associated with the simultaneous presence of both cis and trans isomers of the gold complex in the conducting layers. The salt is semiconducting (sigma(RT) = 3 x 10(-2) S cm(-1), E-act = 0.137 eV) but, in contrast with other 1 : 2 gold bis(dithiolene) salts, turns metallic under pressure (>10 GPa). [Ph4P][Au(Me-thiazds)(2)](2) is thus the first metallic, fully characterized, 1 : 2 mixed-valence gold complex, opening the door for the preparation of highly conducting solids of this type.

Domaines

Chimie Matériaux
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Dates et versions

hal-03331375 , version 1 (17-09-2021)

Identifiants

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Yann Le Gal, Hengbo Cui, Pere Alemany, Enric Canadell, Reizo Kato, et al.. Mixed-valence gold bis(diselenolene) complex turning metallic under pressure. Journal of Materials Chemistry C, 2021, 9 (36), pp.12291-12302. ⟨10.1039/d1tc02751d⟩. ⟨hal-03331375⟩
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