Scanning Tunneling Microscopy Study of alpha,omega-Dihexylsexithiophene Adlayers on Au(111): A Chiral Separation Induced by a Surface

作者：Song, Yonghai^*; Wang, Yu; Wan, Lingli; Ye, Shuhong; Hou, Haoqing; Wang, Li

来源：Microscopy and Microanalysis, 2012, 18(4): 885-891.

DOI：10.1017/S1431927612000566

• chirality
• scanning tunneling microscopy
• alpha,omega-dihexylsexithiophene
• mirror symmetric
• flat-lying adsorption

The self-assembly of alpha,omega-dihexylsexithiophene molecules on an Au(111) surface was examined by using scanning tunneling microscopy at room temperature, revealing the internal molecular structures of the sexithiophene backbones and the hexyl side chains. The alpha,omega-dihexylsexithiophene formed a large and well-ordered monolayer in which the molecule lay flatly on the Au(111) surface and was separated into two chiral domains. A detailed observation reveals that the admolecules were packed in one lamellae with their molecular axis aligned along the main axis of the Au(111) substrate with their hexyl chains deviated from < 110 > direction of the Au(111) substrate by 12 +/- 0.5 degrees. In contrast to the behavior in the three-dimensional bulk structure, flat-lying adsorption introduced molecular chirality: right-and left-handed molecules separate into domains of two different orientations, which are mirror symmetric with respect to the < 121 > direction of the Au(111) substrate. Details of the adlayer structure and the chiral self-assembly were discussed here.

• 出版日期2012-8
• 单位江西师范大学