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Charge Transfer Complex of Hexakis (Alkylthio) Benzene with Tetrafluorotetracyanoquinodimethane (tEDTB)2 TCNQF4

Published online by Cambridge University Press:  25 February 2011

D. Chasseau ,
M. Alleaume ,
G. Bravic ,
R. Lapouyade ,
J. P. Morand ,
J. Amiell  and
P. Delhaes
D. Chasseau
Affiliation:
Laboratoire de Cristallographie et Physique Cristalline, URA 144 CNRS
M. Alleaume
Affiliation:
Laboratoire de Cristallographie et Physique Cristalline, URA 144 CNRS
G. Bravic
Affiliation:
Laboratoire de Cristallographie et Physique Cristalline, URA 144 CNRS
R. Lapouyade
Affiliation:
Laboratoire de Photophysique et Photochimie Moléculaire, URA 348 CNRS et ENSCP Bordeaux
J. P. Morand
Affiliation:
Laboratoire de Photophysique et Photochimie Moléculaire, URA 348 CNRS et ENSCP Bordeaux
J. Amiell
Affiliation:
Centre de Recherche Paul Pascal CNRS, Domaine Universitaire de Bordeaux I, 33405 - TALENCE Cédex, ( FRANCE).
P. Delhaes
Affiliation:
Centre de Recherche Paul Pascal CNRS, Domaine Universitaire de Bordeaux I, 33405 - TALENCE Cédex, ( FRANCE).
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Abstract

In order to evaluate the potentiality of organic donor molecules for molecular organic ferromagnets, with in principle C3 molecular symmetry, as in the hexakis (alkylthio) benzene, we have prepared single crystals of the charge transfer complex of tris [ethylene dithio] benzene (tEDTB) with TCNQF4, which have been subsequently oxidized with bromine and arsenic pentafluoride gas. The stoichiometry of this complex is 2:1 and it crystallizes in the triclinic system, space group P1 with the following cell parameters: a=11.515, b=11.044, c=10.460 A, α=111.50°, β=122.50°, γ=93.82°. The crystal structure consists of columns of alternating donor dyads and acceptors monads (DDADDA). The degree of charge transfer is estimated to be 0.2-0.3 from the methods based on bond lengths. While (tEDTB)2- TCNQF4 does not give a significant ESR spectrum, after treatment with the bromine or AsF5 gas, a single intense line, centered around the free electron g value, appears without any evidence of either a ground or an excited triplet state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 173: Symposium Q – Advanced Organic Solid State Materials , 1989 , 27
Copyright
Copyright © Materials Research Society 1990

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References

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