bis(tetrathiafulvalene) [bis(TTF)] compounds; charge-localized cations; ab initio calculations
Abstract :
[en] The series of new bis(tetrathiafulvalene) [bis(TTF)] compounds 10-12a,b have been synthetized with the TTF-like synthon 8a,b, previously used to prepare the pyrazine-fused bis(TTF) 7a,b. These compounds exhibit four reversible sequential one-electron oxidation steps, on the basis of cyclic voltammetry. For the cation radicals 7b(.+), 10(.+), and 12(.+), generated electrochemically, rather intense and broad bands in the near-IR region, specific of class II mixed valence compounds, were found. Theoretical calculations at the semiempirical AM1 level as well as at the ab-initio level indicated that these cation radicals are charge-distributions localized as related to mixed valence species. These calculations also allowed the low-energy absorption bands to be assigned to intervalence transitions; these transitions imply the existence of multiple low-lying excited states that are non-adiabatically coupled to the ground-state of these open-shell species.
Disciplines :
Chemistry
Author, co-author :
Lahlil, Khalid
Moradpour, Alec
Bowlas, Christopher
Menou, Frédéric
Cassoux, Patrick
Bonvoisin, Jacques
Launay, Jean-Pierre
Dive, Georges ; Université de Liège - ULiège > Centre d'ingénierie des protéines
Dehareng, Dominique ; Université de Liège - ULiège > Centre d'ingénierie des protéines
Language :
English
Title :
INTERVALENCE TRANSITIONS IN MIXED-VALENCE BIS(TETRATHIAFULVALENE) COMPOUNDS
Publication date :
1995
Journal title :
Journal of the American Chemical Society
ISSN :
0002-7863
eISSN :
1520-5126
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
117
Issue :
40
Pages :
9995-10002
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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