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X-Ray Diffraction and Mossbauer Spectroscopy Studies of Pressure-Induced Phase Transitions in a Mixed-Valence Trinuclear Iron Complex

机译:X射线衍射和Mossbauer光谱研究混合价三核铁络合物中压力诱导的相变

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摘要

The mixed-valence complex Fe3O(cyanoacetate)(6)(H2O)(3) (1) has been studied by single-crystal X-ray diffraction analysis at pressures up to 5.3(1) GPa and by (synchrotron) Mossbauer spectroscopy at pressures up to 8(1) GPa. Crystal structure refinements were possible up to 4.0(1) GPa. In this pressure range, 1 undergoes two pressure-induced phase transitions. The first phase transition at around 3 GPa is isosymmetric and involves a 608 rotation of 50% of the cyanoacetate ligands. The second phase transition at around 4 GPa reduces the symmetry from rhombohedral to triclinic. Mossbauer spectra show that the complex becomes partially valence-trapped after the second phase transition. This sluggish pressure-induced valence-trapping is in contrast to the very abrupt valence-trapping observed when compound 1 is cooled from 130 to 120 K at ambient pressure.
机译:混合价络合物Fe3O(cyanoacetate)(6)(H2O)(3)(1)已通过在高达5.3(1)GPa的压力下通过单晶X射线衍射分析以及在2000年通过(同步加速器)Mossbauer光谱研究了压力高达8(1)GPa。晶体结构的细化可能达到4.0(1)GPa。在此压力范围内,1经历了两个压力引起的相变。大约3 GPa处的第一个相变是等对称的,涉及50%的氰基乙酸酯配体的608旋转。大约4 GPa的第二相变降低了菱形到三斜面的对称性。 Mossbauer光谱表明,在第二个相变之后,该络合物变成了部分化合价。这种缓慢的压力诱导的价陷阱与在环境压力下将化合物1从130 K冷却到120 K时观察到的非常突然的价陷阱相反。

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