Related Experiment Video
Updated: May 13, 2026
08:54
Facile Preparation and Photoactivation of Prodrug-Dye Nanoassemblies
Published on: February 17, 2023
Surface charge inversion of self-assembled monolayers by visible light irradiation: cargo loading and release by
You Yu1, Xiaomin Kang, Xinshi Yang
1Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China.
Chemical Communications (Cambridge, England)
|March 19, 2013
Abstract:
In this study, we find that visible light can trigger both the loading and the release of N-alkyl substituted 4-picolinium on self-assembled monolayers (SAM). The latter process will result in surface-charge inversion of the SAM, which can be used for controlled release of molecules of interest.
Related Concept Videos
01:26Photochemical Electrocyclic Reactions: Stereochemistry
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.