Predictability of Thermal and Electrical Properties of End-Capped Oligothiophenes by a Simple Bulkiness Parameter

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• 作者：Andreas Kreyes ; Ahmed Mourran ; Zhihua Hong ; Jingbo Wang ; Martin M枚ller ; Fatemeh Gholamrezaie ; W. S. Christian Roelofs ; Dago M. de Leeuw ; Ulrich Ziener
• 刊名：Chemistry of Materials
• 出版年：2013
• 出版时间：May 28, 2013
• 年：2013
• 卷：25
• 期：10
• 页码：2128-2136
• 全文大小：610K
• 年卷期：v.25,no.10(May 28, 2013)
• ISSN：1520-5002

文摘

The branching topology of end groups attached to several series of oligothiophenes has a systematic effect on thermal and electrical properties of the oligomers. The series were synthesized in a modular approach and show a distinct drop of the melting point T_m on increasing bulkiness of the substituents. The same trend can be found for the dissociation temperatures T_dis of aggregates in solution. Similarly, monolayer OFET mobilities 渭_FET are significantly decreasing with increasing bulkiness of the substituents. A simple geometric model is presented quantitatively correlating the transition temperatures and mobilities with the substituents鈥?structure based on a bulkiness parameter P, which allows predicting T_m, T_dis, and 渭_FET of corresponding not yet synthesized oligomers with branched substituents. This model might be generally applicable for end-capped rod-like conjugated oligomers.

Keywords:

transition temperature; oligothiophene; branched substituents; structure鈭抪roperty relationship; OFET mobility