Intrinsic paramagnetism of doped polypyrroles and polythiophenes: Electron spin resonance of the polymers prepared by the use of copper(II) compounds as oxidative coupling agents

Motomichi Inoue; Michiko B. Inoue; Ma Monica Castillo-Ortega; Motohiro Mizuno; Tetsuo Asaji; Daiyu Nakamura

doi:10.1016/0379-6779(89)90480-3

Intrinsic paramagnetism of doped polypyrroles and polythiophenes: Electron spin resonance of the polymers prepared by the use of copper(II) compounds as oxidative coupling agents

Motomichi Inoue^*, Michiko B. Inoue, Ma Monica Castillo-Ortega, Motohiro Mizuno, Tetsuo Asaji, Daiyu Nakamura

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Electron spin resonance studies were carried out on the perchlorate and trifluoromethanesulfonate (triflate) of polypyrrole and polythiophene, which were prepared by polymerizing an appropriate monomer by the use of copper(II) perchlorate or triflate as an oxidative coupling agent. The linewidth was largely influenced by the nature of the counter anions as well as by the adsorbed oxygen. The signal intensity observed for all the materials including both the oxygen-free and the oxygen-adsorbing polymers was very weakly temperature dependent, in contrast to the Curie-type paramagnetism already reported for electrochemically prepared polypyrrole: the Weiss constant was 225 - 573 K depending on the nature of the polymers. This suggests the presence of a strong antiferromagnetic interaction between unpaired electrons involved in the polymer chains; polarons as well as defect spins are possible paramagnetic species.

Original language	English
Pages (from-to)	355-364
Number of pages	10
Journal	Synthetic Metals
Volume	33
Issue number	3
DOIs	https://doi.org/10.1016/0379-6779(89)90480-3
State	Published - 30 Nov 1989

Bibliographical note

Funding Information:
The work at the Universidad de Sonora was supported by the Direcci6n General de Investigaci6n Cientffica y Superaci6n Acad~mica, SEP (Grant No. C88-08-0213-2). The authors thank H. Grijalva for his assistance in sample preparation.

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title = "Intrinsic paramagnetism of doped polypyrroles and polythiophenes: Electron spin resonance of the polymers prepared by the use of copper(II) compounds as oxidative coupling agents",

abstract = "Electron spin resonance studies were carried out on the perchlorate and trifluoromethanesulfonate (triflate) of polypyrrole and polythiophene, which were prepared by polymerizing an appropriate monomer by the use of copper(II) perchlorate or triflate as an oxidative coupling agent. The linewidth was largely influenced by the nature of the counter anions as well as by the adsorbed oxygen. The signal intensity observed for all the materials including both the oxygen-free and the oxygen-adsorbing polymers was very weakly temperature dependent, in contrast to the Curie-type paramagnetism already reported for electrochemically prepared polypyrrole: the Weiss constant was 225 - 573 K depending on the nature of the polymers. This suggests the presence of a strong antiferromagnetic interaction between unpaired electrons involved in the polymer chains; polarons as well as defect spins are possible paramagnetic species.",

author = "Motomichi Inoue and Inoue, {Michiko B.} and Castillo-Ortega, {Ma Monica} and Motohiro Mizuno and Tetsuo Asaji and Daiyu Nakamura",

note = "Funding Information: The work at the Universidad de Sonora was supported by the Direcci6n General de Investigaci6n Cientffica y Superaci6n Acad~mica, SEP (Grant No. C88-08-0213-2). The authors thank H. Grijalva for his assistance in sample preparation.",

year = "1989",

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doi = "10.1016/0379-6779(89)90480-3",

language = "Ingl{\'e}s",

volume = "33",

pages = "355--364",

journal = "Synthetic Metals",

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publisher = "Elsevier BV",

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Intrinsic paramagnetism of doped polypyrroles and polythiophenes: Electron spin resonance of the polymers prepared by the use of copper(II) compounds as oxidative coupling agents. / Inoue, Motomichi; Inoue, Michiko B.; Castillo-Ortega, Ma Monica et al.
In: Synthetic Metals, Vol. 33, No. 3, 30.11.1989, p. 355-364.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Intrinsic paramagnetism of doped polypyrroles and polythiophenes

T2 - Electron spin resonance of the polymers prepared by the use of copper(II) compounds as oxidative coupling agents

AU - Inoue, Motomichi

AU - Inoue, Michiko B.

AU - Castillo-Ortega, Ma Monica

AU - Mizuno, Motohiro

AU - Asaji, Tetsuo

AU - Nakamura, Daiyu

N1 - Funding Information: The work at the Universidad de Sonora was supported by the Direcci6n General de Investigaci6n Cientffica y Superaci6n Acad~mica, SEP (Grant No. C88-08-0213-2). The authors thank H. Grijalva for his assistance in sample preparation.

PY - 1989/11/30

Y1 - 1989/11/30

N2 - Electron spin resonance studies were carried out on the perchlorate and trifluoromethanesulfonate (triflate) of polypyrrole and polythiophene, which were prepared by polymerizing an appropriate monomer by the use of copper(II) perchlorate or triflate as an oxidative coupling agent. The linewidth was largely influenced by the nature of the counter anions as well as by the adsorbed oxygen. The signal intensity observed for all the materials including both the oxygen-free and the oxygen-adsorbing polymers was very weakly temperature dependent, in contrast to the Curie-type paramagnetism already reported for electrochemically prepared polypyrrole: the Weiss constant was 225 - 573 K depending on the nature of the polymers. This suggests the presence of a strong antiferromagnetic interaction between unpaired electrons involved in the polymer chains; polarons as well as defect spins are possible paramagnetic species.

AB - Electron spin resonance studies were carried out on the perchlorate and trifluoromethanesulfonate (triflate) of polypyrrole and polythiophene, which were prepared by polymerizing an appropriate monomer by the use of copper(II) perchlorate or triflate as an oxidative coupling agent. The linewidth was largely influenced by the nature of the counter anions as well as by the adsorbed oxygen. The signal intensity observed for all the materials including both the oxygen-free and the oxygen-adsorbing polymers was very weakly temperature dependent, in contrast to the Curie-type paramagnetism already reported for electrochemically prepared polypyrrole: the Weiss constant was 225 - 573 K depending on the nature of the polymers. This suggests the presence of a strong antiferromagnetic interaction between unpaired electrons involved in the polymer chains; polarons as well as defect spins are possible paramagnetic species.

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Intrinsic paramagnetism of doped polypyrroles and polythiophenes: Electron spin resonance of the polymers prepared by the use of copper(II) compounds as oxidative coupling agents

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