Effect of Length of Substituted Alkyl Chain on 2-D Nanostructure

Abstract

Abstract: A series of alkyl-substituted 1,3,5-triphenols were synthesized, and their adsorption and assembling behavior on a highly oriented pyrolytic graphite(HOPG) surface were studied by scanning tunneling microscopy(STM) under ambient conditions. A characteristic stripe-like structure was observed from these samples. In high-resolution STM images of the molecules with shorter chains, we found that two parallel alkyl chains were arranged side by side on one side of the phenylring, another alkyl chain was arranged on the other side and the alkyl chains interdigitate to form a uniform alkane lamella. The high stability and close-packed assembly were interrupted with increasing the chain length, and the co-existing self-assembly structure of the single molecule and dimmer was formed. This result is attributed to Van der Waals interactions between the alkyl chain-alkyl chain and the alkyl chain-substrate. This observation illustrates that changing alkyl chain length is an effective method for obtaining various two-dimensional molecular assemblies.

Key words: Scanning tunneling microscopy(STM), Self-assembly, Nanostruture, Nanoconstruction

CLC Number:

O647.1

TrendMD:

XU Shan-Dong, ZENG Qing-Dao, QIAO Ying-Hong, WANG Chen, WAN Li-Jun, BAI Chun-Li . Effect of Length of Substituted Alkyl Chain on 2-D Nanostructure[J]. Chem. J. Chinese Universities, 2003, 24(6): 1085.

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Effect of Length of Substituted Alkyl Chain on 2-D Nanostructure

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