The influence of side chains on the structures and properties of functionalized pentacenes
作者:Jihua Chen、Sankar Subramanian、Sean R. Parkin、Maxime Siegler、Kaitlin Gallup、Chelsea Haughn、David C. Martin、John E. Anthony
DOI:10.1039/b717082c
日期:——
We investigated substituent-induced variations in microstructure and physical properties of a family of functionalized pentacenes, materials currently of intensive interest for making organic electronic devices such as thin film transistors, to shed light on the complex relationships between functionalization, film formation, stability, and microstructure. In this study, the pentacenes were modified with alkyl acetylene or alkylsilylethynyl groups with systematic variations in the alkyl chain length. With a proper side chain, this modification can effectively disrupt the herringbone packing seen in neat pentacene, promoting face-to-face arrangements between the acene rings and providing solubility in a variety of convenient solvents. Thin films can be readily formed by solution casting from THF, bromobenzene, toluene and other organic solvents. We have investigated the structure and properties of the functionalized pentacenes using UV-vis spectroscopy, hot stage optical microscopy, differential scanning calorimetry, transmission electron microscopy, X-ray and electron diffraction. The materials show regular variations in their thermal behavior, crystal packing and macroscopic properties as the chemistry of the side-group substituent changes.
我们研究了取代基引起的一系列官能化并五苯的微观结构和物理性质的变化,这些材料目前在制造薄膜晶体管等有机电子器件方面受到广泛关注,以揭示官能化、成膜、稳定性和性能之间的复杂关系。微观结构。在这项研究中,并五苯用烷基乙炔或烷基甲硅烷基乙炔基进行修饰,烷基链长度有系统的变化。通过适当的侧链,这种修饰可以有效地破坏纯并五苯中的人字形堆积,促进并苯环之间的面对面排列,并提供在各种方便溶剂中的溶解度。使用THF、溴苯、甲苯和其他有机溶剂通过溶液流延可以容易地形成薄膜。我们使用紫外可见光谱、热台光学显微镜、差示扫描量热法、透射电子显微镜、X 射线和电子衍射研究了官能化并五苯的结构和性质。随着侧基取代基化学性质的变化,材料的热行为、晶体堆积和宏观性能表现出规律性的变化。