Structure, Physical Properties and Phase Transition of a Quasi-One-Dimensional Organic Semiconductor DBA(TCNQ)2

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• 作者：Hailin Peng ; Chunbo Ran ; Zhongfan Liu ; Yunze Long ; Zheming Wang ; Zhengqiang Yu ; Haoling Sun ; Yongge Wei ; Song Gao ; Zhaojia Chen ; Er-Qiang Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：July 24, 2008
• 年：2008
• 卷：112
• 期：29
• 页码：11001-11006
• 全文大小：232K
• 年卷期：v.112,no.29(July 24, 2008)
• ISSN：1932-7455

文摘

The present article investigates a reversible structural phase transition, and related physical properties change in a new quasi-one-dimensional (1D) organic semiconductor crystal, DBA(TCNQ)₂ [DBA = dibutylammonium, TCNQ = 7,7,8,8-tetracyanoquinodimethane]. Differential scanning calorimetry traces reveal the DBA(TCNQ)₂ single crystal undergoes a first-order reversible phase transition at around 260−270 K, which is accompanied by a dramatic change in both conductivity and magnetic susceptibility. A direct correlation of physical properties with crystal structure is established. Detailed X-ray structure analyses indicate a reversible structural change related to dimer−tetramer transition along the TCNQ chain and disruption of the hydrogen-bonding chains as the temperature decreases from 270 to 253 K, which is the origin of the electronic and magnetic transition.