Magnetic properties and exchange couplings of one-dimensionally arrayed 4f―3d heterometallic [Ln2Cu2]n compounds

Magnetic properties and exchange couplings of one-dimensionally arrayed 4f―3d heterometallic [Ln2Cu2]n compounds
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一维阵列4f―3d异金属[Ln2Cu2]n化合物的磁性能和交换耦合

DOI:
10.1016/j.poly.2008.12.035
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发表时间:
2009
期刊:
影响因子:
2.6
通讯作者:
T. Ishida
T. Ishida
中科院分区:
化学3区
文献类型:
--
作者:
A. Okazawa;R. Watanabe;H. Nojiri;T. Nogami;T. Ishida

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合成了异金属聚合物配合物[{Ln(hfac)2(CH3OH)}2{Cu(dmg)(Hdmg)}2]n([Ln2Cu2]n;Ln=Tb,Ho,Er;H_2dMg=丁二酮肟;Hhfac=1,1,1,5,5,5-hexafluoropentane-2,4-dione),X-射线单晶分析表明,它们的结构与已知的亚铁磁性化合物[Gd2Cu2]NAND[Dy2Cu2]的结构相似。用高频电子顺磁共振和脉冲场磁化研究对[Tb2Cu2]n,[Ho2Cu2]n和[Er2Cu2]n中的交换耦合进行了精确的估算,得到JTb−Cu/kB=−0.77(2)K,JHO−Cu/kB=−0.250(12)K和Jer−Cu/kB=−0.149(15)K,与Gd和Dy的类似物相当。交换耦合参数的绝对值按Gd、Tb、Dy、Ho和Er的顺序单调减小。
Heterometallic polymeric coordination compounds [{Ln(hfac)2(CH3OH)}2{Cu(dmg)(Hdmg)}2]n([Ln2Cu2]n; Ln=Tb, Ho, and Er; H2dmg=dimethylglyoxime; Hhfac=1,1,1,5,5,5-hexafluoropentane-2,4-dione) were synthesized, and the X-ray crystallographic analysis shows that their structures are isomorphous to those of the known ferrimagnetic [Gd2Cu2]nand [Dy2Cu2]nanalogs. The exchange couplings in [Tb2Cu2]n, [Ho2Cu2]n, and [Er2Cu2]nwere precisely evaluated by high-frequency EPR and pulsed-field magnetization studies, giving JTb−Cu/kB=−0.77(2)K, JHo−Cu/kB=−0.250(12)K and JEr−Cu/kB=−0.149(15)K. They were comparable to those of the Gd and Dy analogs. The absolute value of the exchange coupling parameter monotonically decreases in the order of Gd, Tb, Dy, Ho, and Er.
四核异金属循环 Dy,Cu2 和相应的聚合物表现出磁化重新取向的缓慢弛豫
DOI: --
发表时间: 2007
期刊: Polyhedron 26
影响因子: --
作者:
S.;Ueki;A.;Okazawa;T.;Ishida;T.;Nogami;H.;Nojiri
通讯作者: Nojiri
DOI: 10.1016/s0009-2614(03)01323-x
发表时间: 2003-09
影响因子: 2.8
作者:
Yasuko Kobayashi;S. Ueki;T. Ishida;T. Nogami
通讯作者: Yasuko Kobayashi;S. Ueki;T. Ishida;T. Nogami
DOI: --
发表时间: 2008
期刊: Chem. Mate 20
影响因子: --
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A. Okazawa;et.al.
通讯作者: et.al.
DOI: 10.1021/ja029629n
发表时间: 2003-07-23
影响因子: 15
作者:
Ishikawa, N;Sugita, M;Kaizu, Y
通讯作者: Kaizu, Y