کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5398258 1505885 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photoprocesses in 7-hydroxy coumarins molecules in solutions and SiO2 sol-gel films - Materials for optical chemical sensorics
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Photoprocesses in 7-hydroxy coumarins molecules in solutions and SiO2 sol-gel films - Materials for optical chemical sensorics
چکیده انگلیسی
The paper investigates the spectral properties of protolytic forms of three substituted 7-hydroxy coumarin molecules in aqueous ethanol solutions and SiO2 films. It explains spectral-and-luminescent properties of coumarins in the produced films. It is found that in aqueous ethanol solutions and sol-gel films, upon excitation in the S1 state, there is a reaction of proton phototransfer from the О-Н group of neutral coumarins molecules to the water molecule with development of anionic forms solvated by hydroxonium ions. We studied sensory properties of compounds in the films to the ammonia gas in terms of changes in their fluorescent properties and revealed the reasons causing such changes. We demonstrated the prospects of using films with one of the investigated coumarins as the ammonia gas sensitive material of an optical chemical sensor.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 176, August 2016, Pages 220-226
نویسندگان
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