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Magnetic Properties in Charge-Transfer Complexes of High-Symmetry Organic Acceptors

Published online by Cambridge University Press:  25 February 2011

Toyonari Sugimoto ,
Eiji Murahashi ,
Kaoru Ikeda ,
Zen-Ichi Yoshida ,
Hiroshi Nakatsuji ,
Jun Yamauchi ,
Yasushi Kai  and
Nobutami Kasai
Toyonari Sugimoto
Affiliation:
Department of Synthetic Chemistry, Kyoto University, Yoshida, Kyoto 606, Japan
Eiji Murahashi
Affiliation:
Department of Synthetic Chemistry, Kyoto University, Yoshida, Kyoto 606, Japan
Kaoru Ikeda
Affiliation:
Department of Synthetic Chemistry, Kyoto University, Yoshida, Kyoto 606, Japan
Zen-Ichi Yoshida
Affiliation:
Department of Synthetic Chemistry, Kyoto University, Yoshida, Kyoto 606, Japan
Hiroshi Nakatsuji
Affiliation:
Department of Synthetic Chemistry, Kyoto University, Yoshida, Kyoto 606, Japan
Jun Yamauchi
Affiliation:
College of Liberal Arts and Science, Kyoto University, Yoshida, Kyoto 606, Japan
Yasushi Kai
Affiliation:
Department of Applied Chemistry, Osaka University, Yamadaoka, Osaka 565, Japan
Nobutami Kasai
Affiliation:
Department of Applied Chemistry, Osaka University, Yamadaoka, Osaka 565, Japan
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Abstract

Tris(l, 2-benzodithio)- and tris(l, 2-ethylenedithio)-trimethylenemethane dication salts were synthesized for the purpose of using as an acceptor in the formation of charge-transfer (CT) complexes with some dianionic donors. In the CT complexes of these dications with hexacyanotrimethylenecyclopropane and tetrafluorotetracyanoquinodimethane dianions, in which the CT degree is albeit small, the spin-spin interaction between the cation radical and the anion radical was antiferro magnetic in the temperature range of 60–293 K, but changed to a ferromagnetic one in the lower temperature range till 15 K, the lowest temperature used in this experiment. This provides the first demonstration of ferromagnetic spin-spin interaction in purely organic/molecular CT complexes. It is conceivable that the ferromagnetic spin-spin interaction is caused by a“spin polarization”mechanism rather than a“CT configurational mixing”mechanism.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 417
Copyright
Copyright © Materials Research Society 1992

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References

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