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Role of High-Spin Molecules as Models for Organic Ferro- and Ferri-Magnets, and Pi-Toporegulated Magnetic Polymers

Published online by Cambridge University Press:  25 February 2011

Takeji Takui
Affiliation:
Osaka City University, Faculty of Science, Department of Chemistry, Sugimoto, Sumiyoshi-ku, Osaka 558, JAPAN
Makoto Endoh
Affiliation:
Osaka City University, Faculty of Science, Department of Chemistry, Sugimoto, Sumiyoshi-ku, Osaka 558, JAPAN
Masayuki Okamoto
Affiliation:
Osaka City University, Faculty of Science, Department of Chemistry, Sugimoto, Sumiyoshi-ku, Osaka 558, JAPAN
Kazunobu Satoh
Affiliation:
Osaka City University, Faculty of Science, Department of Chemistry, Sugimoto, Sumiyoshi-ku, Osaka 558, JAPAN
Toyohiro Shichiri
Affiliation:
Osaka City University, Faculty of Science, Department of Chemistry, Sugimoto, Sumiyoshi-ku, Osaka 558, JAPAN
Yoshio Teki
Affiliation:
Osaka City University, Faculty of Science, Department of Chemistry, Sugimoto, Sumiyoshi-ku, Osaka 558, JAPAN
Takamasa Kinoshita
Affiliation:
Osaka City University, Faculty of Science, Department of Chemistry, Sugimoto, Sumiyoshi-ku, Osaka 558, JAPAN
Koichi Itoh
Affiliation:
Osaka City University, Faculty of Science, Department of Chemistry, Sugimoto, Sumiyoshi-ku, Osaka 558, JAPAN
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Abstract

A chemical modification exploiting functional groups such as ether and methylene as bridges between high-spin assemblies has been carried out as a usable method to increase dimensionality of spin structure. Exchange interaction via an ether or a methylene bridge between two high-spin assemblies has been studied by single-crystal ESR spectroscopy. Whether it is ferromagnetic or antiferromagnetic depends upon the substituted position of the bridge, demonstrating the important role of the topological nature in spin alignment. It turns out that superexchange interaction or hyperconjugation mechanism can dominate spin alignment between high-spin assemblies. Using the criteria obtained, model compounds for units of organic ferrimagnets have been synthesized. They possess antiferromagnetically-exchange coupled heterospins and the salient features of their spin structures are characterized in terms of the spin density distribution as determined by single-crystal 1H-ENDOR (Electron-Nuclear-DOuble Resonance) spectroscopy.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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