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Abstract
In this short communication, we report a new carbon material prepared from meta-linked polyaniline that exhibits weak antiferromagnetic interactions at low temperature. The synthesis of poly(meta-aniline), abbreviated as m-PANI, was conducted using the Ullmann reaction with the aid of Cu+ as a catalyst in the presence of K2CO3. After the generation of radical cations by vapor-phase doping with iodine, carbonization was performed to prepare carbon polyaniline (C-PANI), which comprises condensed benzene rings. Analysis with a superconducting quantum interference device revealed that the resultant carbon exhibits antiferromagnetism at low temperatures. The discovery of this weak antiferromagnetic carbon may contribute to the development of carbon magnets.
Highlights
Polymer magnetism has been intensively studied with the aim of obtaining polymer ferromagnets that exhibit a ferromagnetic spin alignment
The magnetic coupling of triplet phenylene units was reported by Iwamura in 1989 [1]; the ferromagnetic behavior of pyrolyzed o, m, and p-phenylenediamine and triazine derivatives was reported by Yoshino [2]; and Nishide et al achieved ferromagnetic spin alignment with 3,4‘-bis(diphenylamino)stilbene [3]
We present the synthetic method for the preparation of weak antiferromagnetic carbon and the superconducting quantum interference device (SQUID) analysis results as a contribution to the development of carbon magnets
Summary
Polymer magnetism has been intensively studied with the aim of obtaining polymer ferromagnets that exhibit a ferromagnetic spin alignment. The magnetic coupling of triplet phenylene units was reported by Iwamura in 1989 [1]; the ferromagnetic behavior of pyrolyzed o-, m-, and p-phenylenediamine and triazine derivatives was reported by Yoshino [2]; and Nishide et al achieved ferromagnetic spin alignment with 3,4‘-bis(diphenylamino)stilbene [3]. Carbon magnets have been widely studied by both experimental and theoretical techniques [6,7]. Our research group has focused on the development of organic magnetic materials for a long time.
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