Self-Assembled Monolayers of 7-(10-Thiodecoxy)coumarin on Gold: Synthesis, Characterization, and Photodimerization

摘要: As is true in solution, irradiation at 350 nm of 7-(10-thiodecoxy)coumarin (1) as a self-assembled monolayer on polycrystalline gold (Au-1) produces [2 + 2] photodimers. In the monolayer, photodimerization indicated by differences grazing angle surface FTIR spectra, sessile drop contact angles, and fluorescence spectra before after irradiation. The can be reversed 254 nm, demonstrated changes these same structural probes. Better photochemical reversibility regioselectivity are observed when situ conducted dry solid than with benzene. A comparison structure syn head-to-head (H-H) dimer (Au-2) that photodimers generated Au-1 demonstrates reorganization accomplished photodimerization−photoreversion cycle.