Intramolecular Long Range Electronic Spin Exchange Coupling in Diradicals: A New Magnetic Coupling Unit
作者:
Philippe Turek,
Pascale Wautelet,
JacquesLe Moigne,
Jean-Louis Stanger,
Jean-Jacques André,
André Bieber,
Paul Rey,
André De Cian,
Jean Fischer,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 272,
issue 1
页码: 99-108
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508055277
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A phenyl diethynyl bridge is used as a magnetic coupling unit (MCU) between two iminonitroxide π-radicals. The ethynyl moiety is attached to the central phenyl ring either in the para or in the meta position. The magnetic properties of the resulting bis-imino nitroxide diradicals (p-BIN andm-BIN) are investigated both at the molecular scale and in the condensed phases. An intramolecular through bond spin coupling is observed at an unusual long distance (about 20 ÅS) in both derivatives. However, the ground state is found to be a singlet spin state in both compounds. The results suggest an interplay between the spin polarization and the spin delocalization (π-conjugation). An intermolecular weak antiferromagnetic spin coupling is occuring in both compounds.
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