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- W2335431092 endingPage "5974" @default.
- W2335431092 startingPage "5962" @default.
- W2335431092 abstract "Through a combined quantum mechanics/molecular mechanics (QM/MM) approach, we evaluate the photodynamics of the mono- and dithiolated azobenzenes when they are chemisorbed on a gold surface. The analysis of steric effects suggests that the presence of the surface influences the photoisomerization process of the chemisorbed monothiolated azobenzene. In particular, the trans → cis quantum yields decrease, and the nπ* state lifetimes become longer. The approach to the twisted conical intersection needed for the isomerization is hindered when the molecule is attached to a substrate because of the van der Waals interactions with the surface. For the cis isomer, the cis → trans photoisomerization quantum yield is almost unaffected, since this isomer is not flat, and thus the interaction with the surface is less remarkable. Dithiolated azobenzene can photoisomerize both trans → cis and cis → trans, also when doubly linked to the surface, preserving the two bonds with the gold atoms: the flexibility of the central azo-moiety enables the molecule to photoisomerize without any bond breaking. The quantum yields in this case are even higher than in the monothiolated case, probably because of the strained initial conformation, which must adapt to the available distances between the anchoring sites." @default.
- W2335431092 created "2016-06-24" @default.
- W2335431092 creator A5002897076 @default.
- W2335431092 creator A5007691354 @default.
- W2335431092 creator A5048300600 @default.
- W2335431092 creator A5078141074 @default.
- W2335431092 date "2015-03-10" @default.
- W2335431092 modified "2023-09-25" @default.
- W2335431092 title "Can Azobenzene Photoisomerize When Chemisorbed on a Gold Surface? An Analysis of Steric Effects Based on Nonadiabatic Dynamics Simulations" @default.
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