Short perfluorinated carbon chains do not take o n a helical structure when they are closely packed.

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Mol Cn,1. Lly C r y / , VOI. 35s. pp 401-41 I Kcprints avdilable directly fiom the puhlishrr Photocopying permitted by liceme only 0 2001 OPA (Oier\e.c\ I'uhliihcn Awiclanon) N.V. Published by licence under the Gordon and Breach Science Publishers imprint.The light induced switching of self-assembled monolayers containing azobenzenes is observed in situ by the Kelvin probe method. The switching process is optimized by preparing monolayers from mixed solutions of azobenzene thiols and n-alkylene thiols. In a film the efficiency of the E/Zisornerization depends on both the spacer length between azobenzene group and gold surface as well as the free volume in the film, tuned by the n-alkylene thiol fraction in the mixture. An optimum was found in a mixed self-assembling film conlaining 33% 4-fluoromethyl-4'-(lO-carboxy-decyloxy) azobenzene in a dodecane thiol matrix. The structure of the films were characterized by lTIR and AFM.

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