Linear Antiferromagnetic Interaction in Organic Free Radicals

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概要

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• The static magnetic susceptibilities from 1.8°K to 300°K, and the ESR spectra from 1.5°K to 300°K, of several organic free radicals have been measured on powder samples. The broad maxima in the susceptibility which indicate the antiferromagnetic interaction and the broadening of the ESR absorption lines have been observed. The data are analysed on the basis of the linear Heisenberg model and shown to be consistent with the one-dimensional magnetic chain model of isotropic exchange interaction. Discussions are made of the grounds of susceptibility, the ESR, and the specific heat measurements. In addition to a short-range ordering of spins, the possibility of long-range ordering is also discussed in two radicals, BDPA-Bz and <I>p</I>-Cl-BDPA, on the basis of discontinuities in the slope of susceptibility, the rapid broadening of the ESR linewidth, and the disappearance of the ESR absorption.

• 公益社団法人 日本化学会の論文

著者

• Yamauchi Jun

  The Institute For Chemical Research Kyoto University

関連論文

• Magnetic Phase Transition of Organic Free Radical p-Cl-BDPA
• ESR Studies of Stable Free Radical Pairs in the Diamagnetic Matrix Crystal
• Dipolar interaction in TEMPAD biradical. II.
• Proton Magnetic Resonance in Organic Free Radicals, BDPA–Bz and p-Cl-BDPA
• Linear Antiferromagnetic Interaction in Organic Free Radicals
• Dipolar Interaction in TEMPAD Biradical
• The Chlorine Nuclear Quadrupole Resonance in an Organic Free Radical, p-Cl-EDPA

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