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Magnetic Properties of a Binary Mixture of Paramagnetic Metallomesogens

Published online by Cambridge University Press:  10 February 2011

Y. Shimizu ,
S. Tantrawong ,
M. Yoshida  and
T. Sugino
Y. Shimizu
Affiliation:
Department of Organic Materials, Osaka National Research Institute (ONRI), AIST-MITI Midorigaoka 1–8–31, Ikeda, Osaka 563, Japan
S. Tantrawong
Affiliation:
Joined under STA(Science and Technology Agency) fellowship program. The present address: Department of Chemistry, Thammasat University, Bangkok, Thailand.
M. Yoshida
Affiliation:
Joined from Graduate School of Solid State Electronics, Osaka Electro-Communication University, Hatsucho, Neyagawa, Osaka 572, Japan.
T. Sugino
Affiliation:
Department of Organic Materials, Osaka National Research Institute (ONRI), AIST-MITI Midorigaoka 1–8–31, Ikeda, Osaka 563, Japan
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Abstract

Magnetic properties of a binary mixture of mesogenic tetraphenylporphyrin Cu(II) and VO(IV) complexes are reported. These mesogens show two lamellar mesophases (DL and DLC) and a binary phase diagram revealed that each mesophase is miscible. The magnetic properties were investigated by magnetization measurements using SQUID. It was found that the magnetization of 1:1 mixture (mole% base) was larger than those of the pure compounds below ca. 190 K, whilst 1:3 and 3:1 mixtures showed the decrease of magnetization in the full range of temperature in which the measurements were carried out. It was shown that χ−1 vs. T plots did not obey Curie-Weiss law. For the VO(IV) complex and 1:1 mixture, stepwise changes could be recognized at the temperatures corresponding to the phase transitions. 1:1 mixture as well as Cu(II) and VO(IV) complexes totally involve antiferromagnetic interaction. However, ferromagnetic behavior in χ−1 vs. T plots was seen about DL - DLC phase transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 823
Copyright
Copyright © Materials Research Society 1998

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