Temperature-dependent vibrational spectroscopy to study order-disorder transitions in charge transfer complexes
Temperature-dependent vibrational spectroscopy to study order-disorder transitions in charge transfer complexes
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DOI：
10.1063/1.5018731
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发表时间：
2018-02
期刊：
影响因子：
1.6
通讯作者：
R. Isaac;K. Goetz;Drew Roberts;O. Jurchescu;L. McNeil
中科院分区：
文献类型：
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作者：
R. Isaac;K. Goetz;Drew Roberts;O. Jurchescu;L. McNeil
电荷转移（CT）复合物因其多功能特性而成为半导体行业一类有前途的材料。这类化合物表现出多种相变，由于它们对电子特性的潜在影响而引起人们的兴趣。此处，温度相关振动光谱用于研究一组有机 CT 复合物中的结构相变。芘和均苯四甲酸二酐（PMDA）形成的复合物中红外活性声子的分裂和展宽证实了结构转变是有序-无序类型，并补充了先前的X射线衍射（XRD）结果。我们证明该技术是表征转变的强大工具，并将其应用于一系列由多环芳烃（蒽、苝、菲、芘和二苯乙烯）和 PMDA 组成的二元 CT 配合物。我们扩展了对苝-PMDA 和芘-PMDA 转变的理解，并表明不存在有序-无序转变...
Charge-transfer (CT) complexes are a promising class of materials for the semiconductor industry because of their versatile properties. This class of compounds shows a variety of phase transitions, which are of interest because of their potential impact on the electronic characteristics. Here temperature-dependent vibrational spectroscopy is used to study structural phase transitions in a set of organic CT complexes. Splitting and broadening of infrared-active phonons in the complex formed between pyrene and pyromellitic dianhydride (PMDA) confirm the structural transition is of the order-disorder type and complement previous x-ray diffraction (XRD) results. We show that this technique is a powerful tool to characterize transitions, and apply it to a range of binary CT complexes composed of polyaromatic hyrdocarbons (anthracene, perylene, phenanthrene, pyrene, and stilbene) and PMDA. We extend the understanding of transitions in perylene-PMDA and pyrene-PMDA, and show that there are no order-disorder tran...