One-dimensional phthalocyanine-based conductor with S=3/2 isotropic magnetic centers
One-dimensional phthalocyanine-based conductor with S=3/2 isotropic magnetic centers
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具有 S=3/2 各向同性磁中心的一维酞菁基导体
DOI：
10.1142/s108842461450062x
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and Y.Inabe
中科院分区：
文献类型：
--
作者：
Y.Takita;H.Hasegawa;Y.Takahashi;J.Harada;A.Kanda;N.Hanasaki;and Y.Inabe
制备了四苯基膦酞菁配合物TPP[Cr（Pc）（CN）2]2（TPP =四苯基膦，Pc =酞菁根）与d3（S = 3/2）金属Cr Ⅲ的轴向配位导体。晶体与Co和Fe类似物完全同晶，π-π相互作用的程度在这三种盐中几乎相同。室温下Cr系的电导率与S = 1/2的Fe系的电导率几乎相同，温度依赖性揭示了反映磁矩存在的电荷反折的发展。Cr系的磁化率表现出类居里行为，各向同性局部矩S = 3/2。与Fe系统相反，只有弱的反铁磁相互作用之间的本地化的d-自旋。在外加磁场作用下，电阻减小，但磁电阻效应没有Fe系统那么大，表明Cr系统中的π-d相互作用与Fe系统中的π-d相互作用有些不同。
The axially ligated phthalocyanine conductor of TPP[Cr(Pc)(CN)2]2(TPP = tetraphenylphosphonium and Pc = phthalocyaninato) with d3(S = 3/2) metal CrIIIhas been successfully prepared. The crystal is completely isomorphous with those of the Co and Fe analogs, and the degree of π–π interaction is almost the same in these three salts. The electrical conductivity at room temperature of the Cr system is almost the same with that of the Fe system in which S = 1/2 magnetic centers embedded in the conduction path, and the temperature dependence reveals the development of the charge disproportionation reflecting the existence of magnetic moments. Magnetic susceptibility of the Cr system shows Curie-like behavior with isotropic local moments of S = 3/2. In contrast with the Fe system, only weak antiferromagnetic interaction operates between the localized d-spins. The resistance decreases when magnetic fields are applied, but the magnetoresistance effect is not so large compared with the Fe system, indicating that the π–d interaction in the Cr system is somewhat different from that in the Fe system.