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Dual proton / hole mixed valence in a molecular metal: balancing chemical activity in the solid state by tapping into a molecular hole reservoir

Abstract :

We report on the synthesis, the layered triclinic P (1) over bar crystal structure, band structure and Fermi surface analysis and preliminary transport and ESR data of beta-(EDT-TTF-I-2)(2)((1+x)center dot+)[HO2C-CH=CH-CO2-]((1-x))[-O2C-CH=CH-CO2-](x), a metallic radical cation salt of the nominal, mono-deprotonated pi-conjugated dicarboxylate anion of fumaric acid with a metal-insulator transition at ca. 70 K and conclude that the system is doped, that is, a fraction of the fumarates are further deprotonated to their dianion forms. It is shown that the actual number of protons required within the extended fumarate network to effectively balance the chemical activity at the nuclei/solution interface during crystal growth is compensated by tapping into the HOMO bands serving as a molecular hole reservoir such that the compound formulation and structure remain intact. A dual [proton]/[hole] mixed-valence is thereby revealed and defined as the duality between the modulation of the electrostatic potential of the environment, the incommensurate number and the physics of migrating holes within a molecular system.

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https://hal.univ-angers.fr/hal-03344520
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Soumis le : mercredi 15 septembre 2021 - 10:07:48
Dernière modification le : jeudi 9 décembre 2021 - 15:46:06

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Youssef Lakhdar, Cécile Mézière, Leokadiya Zorina, Michel Giffard, Patrick Batail, et al.. Dual proton / hole mixed valence in a molecular metal: balancing chemical activity in the solid state by tapping into a molecular hole reservoir. Journal of Materials Chemistry, Royal Society of Chemistry, 2011, 21 (5), pp.1516-1522. ⟨10.1039/c0jm02897e⟩. ⟨hal-03344520⟩

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