Magnetic Relaxation of 1D Coordination Polymers (X)2[Mn(acacen)Fe(CN)6], X = Ph4P+, Et4N+
Magnetic Relaxation of 1D Coordination Polymers (X)2[Mn(acacen)Fe(CN)6], X = Ph4P+, Et4N+
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DOI：
10.1021/ic501330j
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发表时间：
2014-10-06
影响因子：
4.6
通讯作者：
Vostrikova, Kira E.
中科院分区：
文献类型：
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作者：
Rams, Michal;Peresypkina, Eugenia V.;Vostrikova, Kira E.
一维聚合物(X)(2)[Mn(Acacen)Fe(CN)(6)]中有机阳离子X的取代使磁性发生了本质的变化。由于存在更大体积的Ph~4P+阳离子，聚阴离子具有更几何扭曲的链骨架，因此与Et4N+相比，增强了单链磁体(SCM)特性。通过磁测量分析，确定了Mn-III的Arrhenius弛豫势垒、交换作用常数和零场分裂各向异性。[Fe(CN)(6)](3-)的配位场计算揭示了Fe磁矩的显著各向异性，支持了这一讨论。
Substitution of the organic cation X in the 1D polymer, (X)(2)[Mn(acacen)Fe(CN)(6)], leads to an essential change in magnetic behavior. Due to the presence of more voluminous Ph4P+ cations, the polyanion has a more geometrically distorted chain skeleton and, as a consequence, enhanced single chain magnet (SCM) characteristics compared to those for Et4N+. The Arrhenius relaxation energy barriers, the exchange interaction constant and the zero-field splitting anisotropy of Mn-III are determined from the analysis of magnetic measurements. The discussion is supported with ligand field calculations for [Fe(CN)(6)](3-) that unveils the significant anisotropy of Fe magnetic moments.