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利用扫描隧道显微镜研究了荧光液晶分子2,5-二-[2-(3,4-二-十二烷氧基-苯基)-乙烯基]-3,6-二甲基吡嗪(BPDP12)在石墨表面上自组装单层膜的结构.实验结果表明,该化合物在石墨表面形成两种自组装结构:一种是稳定的,分子的共轭中心相互平行,烷基链相互交错的密排结构;另一种是不稳定的,分子的共轭中心彼此为烷基链所分隔的非密排结构.分子之间较强的π-π作用和分子烷基链之间的范德华作用力对分子组装的取向形成竞争,是产生两种不同组装结构的根本原因.
Fluorescent liquid crystal molecules of 2,5-di- [2- (3,4-dodecyloxy-phenyl) -vinyl] -3,6- dimethylpyrazine (BPDP12 ) On the surface of graphite self-assembled monolayer.The experimental results show that the compounds form two self-assembled structures on the surface of graphite: one is stable, the molecular conjugation centers are parallel to each other, the alkyl chains are intertwined with each other Row structure and the other is unstable, the conjugate centers of the molecules are non-condensed structures separated by alkyl chains. The strong π-π interaction between molecules and the van der Waals forces between the molecular alkyl chains Competing for the orientation of molecular assembly is the root cause of creating two different assembly structures.