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首页> 外文期刊>Chemistry: A European journal >Metamagnetism and single-chain magnetic behavior in a homospin one-dimensional iron(II) coordination polymer
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Metamagnetism and single-chain magnetic behavior in a homospin one-dimensional iron(II) coordination polymer

机译：高自旋一维铁（II）配位聚合物的超磁性和单链磁性

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Reaction of FeCl _2·4 H _2O with KNCSe and pyridine in ethanol leads to the formation of the discrete complex [Fe(NCSe) _2(pyridine) _4] (1) in which the Fe ~(II) cations are coordinated by two N-terminal-bonded selenocyanato anions and four pyridine co-ligands. Thermal treatment of compound 1 enforces the removal of half of the co-ligands leading to the formation of a ligand-deficient (lacking on neutral co-ligands) intermediate of composition [Fe(NCSe) _2(pyridine) _2] _n (2) to which we have found no access in the liquid phase. Compound 2 is obtained only as a microcrystalline powder, but it is isotypic to [Cd(NCSe) _2(pyridine) _2] _n and therefore, its structure was determined by Rietveld refinement. In its crystal structure the metal cations are coordinated by two pyridine ligands and four selenocyanato anions and are linked into chains by μ-1,3 bridging anionic ligands. Magnetic measurements on compound 1 show only paramagnetic behavior, whereas for compound 2 an unexpected magnetic behavior is found, which to the best of our knowledge was never observed before for a iron(II) homospin compound. In this compound metamagnetism and single-chain magnetic behavior coexist. The metamagnetic transition between the antiferromagnetically ordered phase and a field-induced ferromagnetic phase of the high-spin iron(II) spin carriers is observed at a transition field H _C of 1300 Oe and the single-chain magnetic behavior is characterized by a blocking temperature T _B, estimated to be about 5 K.
机译：FeCl _2·4 H _2O与KNCSe和吡啶在乙醇中的反应导致形成离散的络合物[Fe（NCSe）_2（吡啶）_4]（1），其中Fe〜（II）阳离子由两个N配位-末端键合的硒代氰基阴离子和四个吡啶共配体。化合物1的热处理强制去除一半的配体，导致形成组成[Fe（NCSe）_2（吡啶）_2] _n（2）的配体缺陷（缺乏中性配体）中间体我们发现在液相中没有任何途径。仅以微晶粉末形式获得化合物2，但它与[Cd（NCSe）_2（吡啶）_2] _n同型，因此，其结构通过Rietveld精制确定。在其晶体结构中，金属阳离子由两个吡啶配体和四个硒氰酸根阴离子配位，并通过μ-1,3桥接阴离子配体连接成链。化合物1的磁性测量仅显示顺磁性行为，而化合物2则发现意外的磁性行为，据我们所知，铁（II）高旋体化合物以前从未观察到。在这种复合中，超磁性和单链磁性行为并存。在1300 Oe的跃迁场H _C处观察到高自旋铁（II）自旋载流子的反铁磁有序相与磁场感应的铁磁相之间的亚磁跃迁，并且单链磁行为的特征在于阻断温度T _B，估计约为5K。

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