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Photophysical properties of dioctyl 4-methoxybenzylidenemalonate: UV-B absorber

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Abstract

Dioctyl 4-methoxybenzylidenemalonate (DOMBM) is an effective stabilizer for photolabile 4-tert-butyl-4′-methoxydibenzoylmethane (BMDBM). DOMBM is superior to the most widely used UV-B absorber, octyl methoxycinnamate (OMC), at preserving its UV-B absorbance in the presence of BMDBM. The energy levels of the lowest excited singlet (S1) and triplet (T1) states of DOMBM were determined by measuring fluorescence and phosphorescence spectra in ethanol at 77 K. The energy level of the T1 state of DOMBM is lower than that of BMDBM and is higher than that of OMC. The triplet-triplet energy transfer from BMDBM to DOMBM was demonstrated by measuring the electron paramagnetic resonance (EPR) and time-resolved phosphorescence spectra. The phosphorescence and EPR signals of DOMBM are too weak to be observed through the direct excitation in ethanol at 77 K. The phosphorescence spectrum was observed by using external heavy atom effects of ethyl iodide. The EPR spectrum was observed by using benzophenone as a triplet sensitizer. The fluorescence quantum yield of DOMBM is small in ethanol at room temperature. Only the fast component, due to the heat released from the excited state of DOMBM, was observed in the time-resolved thermal lensing experiments at room temperature. These results show that the quantum yield of the S1 → T1 intersystem crossing is negligible and the deactivation process is predominantly internal conversion to the ground state for DOMBM.

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Authors and Affiliations

  1. Research Center, Shiseido Company Ltd., Hayabuchi, Tsuzuki-ku, Yokohama, 224-8558, Japan

    Nozomi Oguchi-Fujiyama & Kazuyuki Miyazawa

  2. Department of Chemistry, Graduate School of Engineering, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Azusa Kikuchi & Mikio Yagi

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  1. Nozomi Oguchi-Fujiyama
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  2. Kazuyuki Miyazawa
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  3. Azusa Kikuchi
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  4. Mikio Yagi
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Correspondence to Mikio Yagi.

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Oguchi-Fujiyama, N., Miyazawa, K., Kikuchi, A. et al. Photophysical properties of dioctyl 4-methoxybenzylidenemalonate: UV-B absorber. Photochem Photobiol Sci 11, 1528–1535 (2012). https://doi.org/10.1039/c2pp25101a

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