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  • Title: Functionalization, self-assembly, and photoswitching quenching for azobenzene derivatives adsorbed on Au(111).
    Author: Cho J, Berbil-Bautista L, Levy N, Poulsen D, Fréchet JM, Crommie MF.
    Journal: J Chem Phys; 2010 Dec 21; 133(23):234707. PubMed ID: 21186884.
    Abstract:
    We have used scanning tunneling microscopy to investigate the structure and photoswitching behavior of azobenzene molecules functionalized with bulky spacer groups and adsorbed onto Au(111). We find that positioning tert-butyl "legs" in a canted arrangement on the azobenzene phenyl rings quenches photoisomerizability of the molecule on Au(111). Addition of cyano groups at the para positions changes the molecular self-assembly significantly, but does not alter the quenched photoisomerizability. This behavior likely arises from a combination of molecule-surface interactions, molecule-molecule interactions, and alteration of azobenzene electronic structure resulting from the position-specific addition of tert-butyl groups.
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