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Journal Article

Mixed self-assembled monolayers of azobenzene photoswitches with trifluoromethyl and cyano end groups

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Citation

Brete, D., Przyrembel, D., Eickhoff, C., Carley, R., Freyer, W., Reuter, K., et al. (2012). Mixed self-assembled monolayers of azobenzene photoswitches with trifluoromethyl and cyano end groups. Journal of Physics: Condensed Matter, 24(39): 394015. doi:/10.1088/0953-8984/24/39/394015.


Cite as: https://hdl.handle.net/21.11116/0000-000A-D33F-2
Abstract
Mixed self-assembled monolayers (SAMs) of alkanethiolates carrying azobenzene chromophores with either a trifluoromethyl or a cyano substituent have been studied. High-resolution x-ray photoelectron spectroscopy proves that the ratio of adsorbed molecules can be arbitrarily adjusted via the molar fractions in solution. As a function of these molar fractions core level shifts are observed which are attributed to local work-function changes. By simulating the electric dipole field distribution, the continuous core level shifts are ascribed to a homogeneous mixture of molecules with different end groups adsorbed on adjacent lattice sites. Near-edge x-ray absorption fine structure measurements reveal formation of well-ordered SAMs. Despite the difference in dipole moment of the end groups, the molecular tilt and twist angles are identical for both single-component SAMs and a 1:1 mixed SAM.