Reversible switching in self-assembled monolayers of azobenzene thiolates on Au (111) probed by threshold photoemission

Autor:	O. Andreyev, Nils Heinemann, Michael Bauer, Dordaneh Zargarani, Ulrich Jung, Olaf M. Magnussen, Rainer Herges, Sonja Kuhn, Till Leißner, Jan Grunau
Rok vydání:	2012
Předmět:	Steric effects Molecular switch chemistry.chemical_compound X-ray photoelectron spectroscopy Azobenzene chemistry Monolayer General Physics and Astronomy Self-assembled monolayer Physical and Theoretical Chemistry Threshold energy Photochemistry Isomerization
Zdroj:	Chemical Physics. 402:22-28
ISSN:	0301-0104
DOI:	10.1016/j.chemphys.2012.03.025
Popis:	The reversible photo- and thermally activated isomerization of the molecular switch 3-(4-(4-Hexyl-phenylazo)-phenoxy)-propane-1-thiol (ABT, short for A zo B enzene T hiol) deposited by self-assembly from solution on Au (111) was studied using laser-based photoelectron spectroscopy. Differences in the molecular dipole moment characteristic for the trans and the cis isomer of ABT were monitored via changes in the sample work function, accessible by detection of the threshold energy for photoemission. A quantitative analysis of our data shows that the fraction of molecules within the densely packed monolayer that undergoes a switching process is of the order of 1%. This result indicates the relevance of substrate and film defects required to overcome the steric or electronic hindrance of the isomerization reaction in a densely packed monolayer.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::947373221ab7be2d636aab8840831a90 https://doi.org/10.1016/j.chemphys.2012.03.025 Zobrazit plný text záznamu Full Text from ScienceDirect