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首页> 外文期刊>Chemistry: A European journal >Crystal Structures and Phase Sequences of Metallocenium Salts with Fluorinated Anions: Effects of Molecular Size and Symmetry on Phase Transitions to Ionic Plastic Crystals
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Crystal Structures and Phase Sequences of Metallocenium Salts with Fluorinated Anions: Effects of Molecular Size and Symmetry on Phase Transitions to Ionic Plastic Crystals

机译：含氟阴离子金属茂盐的晶体结构和相序：分子大小和对称性对离子塑料晶体相变的影响

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摘要

Sandwich compounds often exhibit various phase transitions, including those to plastic phases. To elucidate the general features of the phase transitions in metallocenium salts, the thermal properties and crystal structures of [Fe(C5Me5)(2)]X ([1]X), [Co(C5Me5)(2)]X ([2]X), and [Fe(C5Me4H)(2)]X ([3]X) have been investigated, where the counter anions (X) are Tf2N (=(CF3SO2)(2)N-), OTf (=CF3SO3-), PF6, and BF4. The Tf2N salts commonly undergo phase transitions from an ordered phase at low temperatures to an anion-disordered phase, followed by a plastic phase and finally melt at high temperatures. All these salts exhibit a phase transition to a plastic phase, and the transition temperature generally decreases with decreasing cation size and increasing anion size. The crystal structures of these salts comprise an alternating arrangement of cations and anions. About half of these salts exhibit phase transitions at low temperatures, which are mostly correlated with the order-disorder of the anion.
机译：夹心化合物通常表现出各种相变，包括到塑性相的相变。为了阐明金属茂盐中相变的一般特征，[Fe（C5Me5）（2）] X（[1] X），[Co（C5Me5）（2）] X（[2 ] X）和[Fe（C5Me4H）（2）] X（[3] X）进行了研究，其中抗衡阴离子（X）为Tf2N（=（CF3SO2）（2）N-），OTf（= CF3SO3 -），PF6和BF4。 Tf2N盐通常经历从低温有序相到阴离子无序相的相变，然后是塑性相，最后在高温下熔融。所有这些盐都表现出向塑性相的相变，并且转变温度通常随着阳离子尺寸的减小和阴离子尺寸的增加而降低。这些盐的晶体结构包含阳离子和阴离子的交替排列。这些盐中约有一半在低温下表现出相变，这主要与阴离子的有序相关。

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