Transient absorption spectra of 2-hydroxybenzophenone photostabilizers |
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| Authors: | Charles Merritt Gary W Scott Amitava Gupta Andre Yavrouian |
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| Institution: | Department of Chemistry, University of California, Riverside, Riverside, California 92521, USA;Energy and Materials Research Section, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91103, USA |
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| Abstract: | Transient absorption spectra (400–600 nm) of 2-hydroxybenzophenone and the methyl methacrylate copolymer of 2-hydroxy, 3-allyl, 4,4'-dimethoxybenzophenone following 355 nm excitation (7–480 ps delay) are reported. A short-lived, 435 nm transient (τ ≈ 10 ps in CH2Cl2) for both molecules is assigned to the lowest excited singlet before internal proton transfer. Weaker, broad T-T absorption is observed after 480 ps. |
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