Self-assembled Structures and Structural Transition of Dimethyl Isophthalate-Functionalized Janus Dendrimers on HOPG Investigated with STM

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (12): 2424.

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Self-assembled Structures and Structural Transition of Dimethyl Isophthalate-Functionalized Janus Dendrimers on HOPG Investigated with STM

ZHANG Xu^1,2, FENG Yu^1,2, FAN Qing-Hua^1*, WAN Li-Jun^1*

1. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2009-06-02 Online:2009-12-10 Published:2009-12-10
Contact: WAN Li-Jun. E-mail: wanlijun@iccas.ac.cn; FAN Qing-Hua. E-mail: fanqh@iccas.ac.cn
Supported by:
国家自然科学基金(批准号: 20733004, 20821003)资助.

Abstract

Abstract:

Self-assembled structures of three dimethyl isophthalate-functionalized Janus dendrimers G₁G₂COOCH₃, G₀G₃COOCH₃, and G₁G₃COOCH₃ were investigated with scanning tunneling microscopy(STM) on HOPG. It was found that G₁G₂COOCH₃, G₀G₃COOCH₃, G₁G₃COOCH₃ assembled into ordered, partial ordered, and disordered structures, respectively. After heated to 60—80 ℃, regular dendrimer dimers could be found on HOPG, resulting in close-packed ordered structures instead of the previous disordered structures. The results show that with the increase of the molecule generation, molecules are bound down onto surface due to the enhanced intermolecular and molecule-substrate interactions. The self-assembly is dependent on the dynamic process, leading to disordered structures. However, when heated, the mobility of dendrimer molecules on surface could be improved. Structural transformation from disordered structures to thermodynamically stable dimeric structures could be observed by STM on G₀G₃COOCH₃ and G₁G₃COOCH₃ adlayers.

Key words: Janus dendrimer; Self-assembly; Structural transition; Scanning tunneling microscopy(STM)

TrendMD:

ZHANG Xu, FENG Yu, FAN Qing-Hua*, WAN Li-Jun*. Self-assembled Structures and Structural Transition of Dimethyl Isophthalate-Functionalized Janus Dendrimers on HOPG Investigated with STM[J]. Chem. J. Chinese Universities, 2009, 30(12): 2424.

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Self-assembled Structures and Structural Transition of Dimethyl Isophthalate-Functionalized Janus Dendrimers on HOPG Investigated with STM

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