Correlation between the Stoichiometry and the Bistability of Electronic States in Valence‐Tautomeric RbxMn[Fe(CN)6]y·zH2O Complexes

Correlation between the Stoichiometry and the Bistability of Electronic States in Valence‐Tautomeric RbxMn[Fe(CN)6]y·zH2O Complexes
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价互变异构RbxMn[Fe(CN)6]y·zH2O配合物的化学计量与电子态双稳定性的相关性

DOI:
10.1002/ejic.200601023
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发表时间:
2007
影响因子:
2.3
通讯作者:
A. Bousseksou
A. Bousseksou
中科院分区:
化学3区
文献类型:
--
作者:
Saioa Cobo;R. Fernández;L. Salmon;G. Molnár;A. Bousseksou

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合成了一系列不同化学计量的普鲁士蓝类似物RbxMn[Fe(CN)6]y·zH2O。元素分析表明,当 z 增加时,x 和 y 呈准线性减小。其中一些样品呈现出 MnII-FeIII 和 MnIII-FeII 电子态之间的一级相变,并在磁化率中观察到大的热磁滞回线。相变温度与化学计量相关,但由于化合物的无序性质,无法进行定量预测。与之前的文献报道相反,量热和拉曼光谱测量表明,电荷转移相变伴随着显着的熵变,ΔS = 48–59 J K–1 mol–1,主要是由振动引起的。除了热相变之外,拉曼光谱还显示低于约。 120 K 光诱导 MnIII-FeII 到 MnII-FeIII 的转化发生在某些化学计量中。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, German, 2007)
A series of Prussian blue analogues, RbxMn[Fe(CN)6]y·zH2O with different stoichiometries have been synthesized. Elemental analyses reveal a quasilinear decrease in x and y when z increases. Some of these samples present a first-order phase transition between the MnII–FeIII and MnIII–FeII electronic states with large thermal hysteresis loops observed in the magnetic susceptibility. The phase-transition temperatures correlate with the stoichiometry, but quantitative predictions cannot be made because of the disordered nature of the compounds. Contrary to previous literature reports, calorimetric and Raman spectroscopic measurements reveal that the charge-transfer phase transition is accompanied by a significant entropy change, ΔS = 48–59 J K–1 mol–1, of mainly vibrational origin. In addition to the thermal phase transition, Raman spectra also show that below ca. 120 K a photoinduced MnIII–FeII to MnII–FeIII conversion occurs in certain stoichiometries.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
DOI: 10.1103/physrevb.73.172415
发表时间: 2006-05
期刊: Physical Review B
影响因子: 3.7
作者:
H. Tokoro;S. Miyashita;K. Hashimoto;S. Ohkoshi
通讯作者: H. Tokoro;S. Miyashita;K. Hashimoto;S. Ohkoshi
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期刊: Phys. Rev. B 68
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