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ID 34185
フルテキストURL
著者
Gotoh, Kazuma Okayama University
Terao, Takeshi Nihon University
Asaji, Tetsuo Nihon University
抄録

Copper(II) compounds {CuCA(phz)(H2O)2}n (H2CA = chloranilic acid, phz = phenazine) having a layer structure of -CuCA(H2O)2- polymer chains and phenazine was studied by 35Cl nuclear quadrupole resonance (NQR). The single NQR line observed at 35.635 MHz at 261.5 K increased to 35.918 MHz at 4.2 K. The degree of reduction of electric field gradient due to lattice vibrations was similar to that of chloranilic acid crystal. Temperature dependence of spin-lattice relaxation time, T1, of the 35Cl NQR signal below 20 K, between 20 and 210 K, and above 210 K, was explained by 1) a decrease of effective electron-spin density caused by antiferromagnetic interaction, 2) a magnetic interaction between Cl nuclear-spin and electron-spins on paramagnetic Cu(II) ions, and 3) an increasing contribution from reorientation of ligand molecules, respectively. The electron spin-exchange parameter |J| between the neighboring Cu(II) electrons was estimated to be 0.33 cm−1 from the T1 value of the range 20−210 K. Comparing this value with that of J = −1.84 cm−1 estimated from the magnetic susceptibility, it is suggested that the magnetic dipolar 2 coupling with the electron spins on Cu(II) ions must be the principal mechanism for the 35Cl NQR spin-lattice relaxation of {CuCA(phz)(H2O)2}n but a delocalization of electron spin over the chloranilate ligand have to be taken into account.

キーワード
crystalline coordination polymer
paramagnetic
nuclear resonance
spin-lattice relaxation
spin exchange
備考
Digital Object Identifer:10.1016/j.molstruc.2006.04.022
Published with permission from the copyright holder. This is the institute's copy, as published in the Journal of Molecular Structure, May 2006, Volume 826, Issue 1, Pages 1-5.
Publisher URL:http://dx.doi.org/10.1016/j.molstruc.2006.04.022
This newest article has not been indexed to the Web of ScienceTM yet. After the library member confirms the WoS record of this article, the WoS link is made on the bibliographic data later.
Copyright © 2006 Elsevier B.V. All rights reserved.
発行日
2006-5
出版物タイトル
Journal of Molecular Structure
826巻
1号
開始ページ
1
終了ページ
5
資料タイプ
学術雑誌論文
言語
English
査読
有り
DOI
Submission Path
physical_and_theoretical_chemistry/26