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

TitreDual proton / hole mixed valence in a molecular metal: balancing chemical activity in the solid state by tapping into a molecular hole reservoir
Type de publicationArticle de revue
AuteurLakhdar, Youssef, Mézière, Cécile , Zorina, Leokadiya, Giffard, Michel , Batail, Patrick , Canadell, Enric, Auban-Senzier, Pascale, Pasquier, Claude, Jérome, D., Náfrádi, Bálint, Forró, László
TypeArticle scientifique dans une revue à comité de lecture
Année2011
LangueAnglais
Numéro5
Pagination1516-1522
Volume21
Titre de la revueJournal of Materials Chemistry
ISSN0959-9428
Résumé en anglais

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.

URL de la noticehttp://okina.univ-angers.fr/publications/ua2649
DOI10.1039/c0jm02897e