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A Spin Transition Molecular Material with a Wide Bistability Domain

机译:具有宽双稳态域的自旋转变分子材料

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[Fe(hyptrz)_3](4-chloro-3-ni-trophenylsulfonate)_2·2H_2O (1; hyptrz = 4-(3'-hydroxypropyl)-1,2,4-triazole) has been syntehsized and its physical properties have been investigated by several physical techniques including magnetic susceptibility measurements, calorimetry, and Mossbauer, optical, and EXAFS spectroscopy. Compound 1 exhibits a spin transition below room temperature, together with a very wide thermal hystresis of about 50 K. This represents the widest hysteresis loop ever oberved for an Fe~(II)-1,2,4-triazole spin transition material. The cooperativity is discussed on the basis of temperature-dependent EXAFS studies and of the structural features of a Cu~(II) analogue. The EXAFS structural model of (1) in both spin states is compared to that obtained for a related material whose spin transition occurs above room temperature. EXAFS spectroscopy suggests that 1,2,4-triazole chain compounds retain a linear character whatever the spin state of the iron(II).
机译:[Fe(hyptrz)_3](4-氯-3-硝基对苯磺酸盐)_2·2H_2O(1; hyptrz = 4-(3'-羟丙基)-1,2,4-三唑)已经合成并且其物理性质已通过几种物理技术进行了研究,包括磁化率测量,量热法和Mossbauer,光学和EXAFS光谱。化合物1在低于室温的温度下表现出自旋转变,并且具有约50 K的非常宽的热滞后。这代表了Fe〜(II)-1,1,2,4-三唑自旋转变材料获得的最宽的磁滞回线。在与温度有关的EXAFS研究和Cu〜(II)类似物的结构特征的基础上讨论了协同性。将(1)在两种自旋状态下的EXAFS结构模型与自相关转变发生在室温以上的相关材料的模型进行比较。 EXAFS光谱表明,无论铁(II)的自旋状态如何,1,2,4-三唑链化合物均保持线性特征。

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