Molecular Forms of Coumarin-307 in Sol-Gel Glasses

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