MAGNETIC-PROPERTIES OF AN ORGANIC BIRADICAL, MESSENGER BNN - MESSENGER PHENYLENE BIS(ALPHA-NITRONYL NITROXIDE)

被引：35

作者：

SHIOMI, D

TAMURA, M

SAWA, H

KATO, R

KINOSHITA, M

机构：

[1] Institute for Solid State Physics, University of Tokyo, Roppongi Minato-ku

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1993年 / 62卷 / 01期

关键词：

BIRADICAL; NITRONYL NITROXIDE; ORGANIC MAGNET; MAGNETIC ENERGY GAP; HEISENBERG SPIN; CRYSTAL STRUCTURE;

D O I：

10.1143/JPSJ.62.289

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetic properties Of a stable organic biradical, meta-phenylene bis(alpha-nitronyl nitroxide) (m-BNN), have been studied. The molecular ground state is found to be triplet (S=1) by the solution EPR measurements. An X-ray structure analysis reveals that m-BNN crystallizes in a dimeric fashion. Susceptibility of a m-BNN single crystal exhibits anomalous temperature dependence as a result of intermolecular exchange interactions. From an analysis based on the structure of magnetic energy spectrum, unusual gap formation in the m-BNN crystals is deduced. The origin of the gaps is discussed in the light of the peculiarity of Heisenberg integer spins.

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页码：289 / 300

页数：12

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