start-ver=1.4
cd-journal=joma
no-vol=826
cd-vols=
no-issue=1
article-no=
start-page=1
end-page=5
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2006
dt-pub=20065
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Cl-35 NQR study of lattice dynamic and magnetic property of a crystalline coordination polymer {CuCA(phz)(H2O)2}n
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=<p>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.</p>
en-copyright=
kn-copyright=

en-aut-name=GotohKazuma
en-aut-sei=Gotoh
en-aut-mei=Kazuma
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=TeraoTakeshi
en-aut-sei=Terao
en-aut-mei=Takeshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=AsajiTetsuo
en-aut-sei=Asaji
en-aut-mei=Tetsuo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Okayama University

affil-num=2
en-affil=
kn-affil=Nihon University

affil-num=3
en-affil=
kn-affil=Nihon University
en-keyword=crystalline coordination polymer
kn-keyword=crystalline coordination polymer
en-keyword=paramagnetic
kn-keyword=paramagnetic
en-keyword=nuclear resonance
kn-keyword=nuclear resonance
en-keyword=spin-lattice relaxation
kn-keyword=spin-lattice relaxation
en-keyword=spin exchange
kn-keyword=spin exchange
END