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Molecular Forms of Coumarin-307 in Sol-Gel Glasses

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Abstract

Coumarin-307(C-307) impregnated sol-gel glass samples were prepared by two methods - (I) predoping using HNO3 as catalyst, and (II) postdoping using HNO3 as catalyst and formamide as drying control chemical additive (DCCA). The absorption/fluorescence properties including fluorescence lifetime of the dye in these sol-gel host matrices were studied and results were compared with dye in methanol (MeOH). In addition to usual non-polar form of C-307 that exists in MeOH, amino-protonated form and dimer of dye have also been found to co-exist in the dried state of samples prepared by predoping method. This behaviour of dye was uncommon to sol and gel states of materials. The fluorescence quantum yield (Qf) of C-307 doped solid was found to be 0.77 and it was almost constant in the concentration range 5×1016 to 8.8×1017 cm−3. On the other hand, only non-polar form of C-307 has been observed in the samples prepared by postdoping method. The Qf value of dye was 0.96 in the postdoped samples. To explain such behaviour of C-307 in the two types of sol-gel matrices: dye concentration, role of HNO3, water, formamide and matrix effect have been taken into account.

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Acknowledgment

The authors thank Department of Science and Technology for the financial support.

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  1. Physics Department, University Institute of Chemical Technology, Matunga, Nathalal Parikh Marg, Mumbai, 400 019, India

    Aparna V. Deshpande & Uday Kumar

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  1. Aparna V. Deshpande
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  2. Uday Kumar
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Correspondence to Aparna V. Deshpande.

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V. Deshpande, A., Kumar, U. Molecular Forms of Coumarin-307 in Sol-Gel Glasses. J Fluoresc 16, 679–687 (2006). https://doi.org/10.1007/s10895-006-0109-5

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