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Article Dans Une Revue Journal of Materials Chemistry C Année : 2020

Single-component conductors based on closed-shell Ni and Pt bis(dithiolene) complexes: metallization under high pressure

Résumé

Neutral, closed-shell nickel and platinum bis(dithiolene) complexes are explored as single-component conductors. Four complexes formulated as [Ni(R-thiazdt)(2)](0)and [Pt(R-thiazdt)(2)](0)(R-thiazdt: 2-alkyl-1,3-thiazoline-2-thione-4,5-dithiolate; R = Me, Et) were obtained by electrocrystallization from the corresponding monoanionic species. Crystal and electronic structures confirm their semi-conducting behavior, and show the presence of a large HOMO-LUMO gap in the ethyl-substituted (R = Et) complexes while the less sterically hindered methyl-substituted ones exhibit higher conductivities and smaller activation energies. Application of high-quality quasi-hydrostatic pressures in the nickel series using a Diamond Anvil Cell (DAC) strongly enhances the conductivity of [Ni(Me-thiazdt)(2)](0), up to 166 S cm(-1)(E-act= 0.1 meV) at 19 GPa. On the other hand, theN-ethyl derivative, [Ni(Et-thiazdt)(2)](0), turns metallic in the low temperature range (<100 K) when the pressure reaches 4.4 GPa, while a further increase of the pressure to 6.9 GPa turns it metallic over the whole temperature range. Pressure dependence of the activation energy for the methyl complex [Ni(Me-thiazdt)(2)](0)suggests that a pressure-induced structural transition hinders the metallization. On the other hand, first-principles calculations for high-pressure structures well explain the pressure-dependence of the conducting behavior of the ethyl complex [Ni(Et-thiazdt)(2)](0).
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Dates et versions

hal-02957713 , version 1 (09-11-2020)

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Hadi Hachem, Hengbo Cui, Takao Tsumuraya, Reizo Kato, Olivier Jeannin, et al.. Single-component conductors based on closed-shell Ni and Pt bis(dithiolene) complexes: metallization under high pressure. Journal of Materials Chemistry C, 2020, 8 (33), pp.11581-11592. ⟨10.1039/d0tc02868a⟩. ⟨hal-02957713⟩
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