Low-temperature heat capacity of heptacopper(II) complex [Cu7(μ3-Cl)2(μ3-OH)6-(d-pen-disulfide)3]
Low-temperature heat capacity of heptacopper(II) complex [Cu7(μ3-Cl)2(μ3-OH)6-(d-pen-disulfide)3]
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DOI：
10.1007/s10973-009-0514-5
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发表时间：
2010
影响因子：
4.4
通讯作者：
N. Tokoro;S. Yamashita;A. Igashira-Kamiyama;J. Fujioka;T. Konno;Y. Nakazawa
中科院分区：
文献类型：
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作者：
N. Tokoro;S. Yamashita;A. Igashira-Kamiyama;J. Fujioka;T. Konno;Y. Nakazawa
本文用单晶量热法测定了d-青霉胺二硫化物负载的双立方结构七铜(II)配合物[Cu7(μ_3-Cl)_2(μ_3-OH)_6-(d-PEN-二硫)_3]的单晶量热。这些铜(II)S通过强的络合物内相互作用相互磁耦合。磁场作用下的热容呈现肖特基反常，这可以用络合物双重态的塞曼分裂来解释。通过对磁场作用下肖特基峰的系统分析，得到基态的g值为1.86。团簇的第一激发态似乎至少被几个开尔文分开，这与理论计算和磁化率结果是一致的。
A single crystal calorimetry of a heptacopper(II) complex of [Cu7(μ3-Cl)2(μ3-OH)6-(d-pen-disulfide)3] which has a double-cubane structure supported byd-penicillaminedisulfides has been performed at low-temperature region below 8 K. This compound is a metal complex which contains seven Cu(II)s in a cluster unit. These Cu(II)s are magnetically coupled each other by strong intra-complex interactions. The heat capacities under magnetic fields exhibit Schottky type anomalies explained by the Zeeman splitting of the doublet ground state of the complex. Theg-value of the ground state is evaluated as 1.86 from the systematic analysis of the Schottky peak under magnetic fields. The first excited state of the cluster seems to be separated at least by several Kelvins, which is consistent with the theoretical calculations and magnetic susceptibility results.