Electron Injection and Energy-Transfer Properties of Spiropyran-Cyclodextrin Complexes Coated onto Metal Oxide Nanoparticles: Toward Photochromic Light Harvesting
Viktoras Dryza, Evan J Bieske
The Journal of Physical Chemistry C | AMER CHEMICAL SOC | Published : 2015
The photochromic and spectroscopic properties of spiropyran-γ-cyclodextrin inclusion complexes coated onto the surface of zirconia and titania nanoparticles (NPs) are examined. After ultraviolet (UV) irradiation, the colorless spiropyran (SP) isomer contained within the cyclodextrin (CD) is converted to the colored merocyanine (MC) isomer, which absorbs light in the 400-600 nm region. A significant increase in the excited-state lifetime for MC-CD on zirconia NPs (τMC = 1.32 ns) is observed compared to MC in solution (τMC = 0.21 ns), indicating that MC → SP photoisomerisation is hindered by the surrounding CD. Excitation of MC-CD on titania NPs results in electron injection into the titania c..View full abstract
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Awarded by Australian Research Council
Awarded by Australian Renewable Energy Agency
This research was supported under the Australian Research Council's Discovery Project funding scheme (Project DP120100100). V.D. acknowledges an Australian Renewable Energy Agency Postdoctoral Fellowship (6-F004) and support from the University of Melbourne's Early Career Researcher Grant Scheme. The picosecond laser was kindly provided by K. P. Ghiggino and T. A. Smith.