کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1232509 968792 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, spectral behaviour and photophysics of donor–acceptor kind of chalcones: Excited state intramolecular charge transfer and fluorescence quenching studies
ترجمه فارسی عنوان
سنتز، رفتار طیفی و فتوفیزیک نوع رسپتور دونور از کلکون ها: انتقال اتمی مولکولی تحریک شده و مطالعات خنک کننده فلورسانس
کلمات کلیدی
کلکونز، فوتوفیزیک، اثر قطر حلال، نانوذرات نقره
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• Chalcones with electron donor acceptor group has been studied.
• The absorption and emission spectrum were sensitive to solvent polarity.
• Fluorescence quantum yield highly depend on polarity of solvents.
• Both chalcones show fluorescence quenching by silver nanoparticles.

The spectral and photophysical properties of two chalcones containing electron donating and accepting groups with intramolecular charge transfer characteristics were synthesized and characterized by 1H NMR, 13C NMR and X-ray crystallography. Both compounds show very strong solvent polarity dependent changes in their photophysical characteristics, namely, remarkable red shift in the emission spectra with increasing solvent polarity, large change in Stokes shift, significant reduction in the fluorescence quantum yield; indicating that the fluorescence states of these compounds are of intramolecular charge transfer (ICT) character. The solvent effect on the photophysical parameters such as singlet absorption, molar absorptivity, oscillator strength, dipole moment, fluorescence spectra, and fluorescence quantum yield of both compounds have been investigated comprehensively. For both dyes, Lippert–Mataga and Reichardt’s correlations were used to estimate the difference between the excited and ground state dipole moments (Δμ). The interactions of dyes with colloidal silver nanoparticles (Ag NPs) were also studied in ethanol using steady state fluorescence quenching measurements. The fluorescence quenching data reveal that dynamic quenching and energy transfer play a major role in the fluorescence quenching of dyes by Ag NPs.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 136, Part C, 5 February 2015, Pages 1893–1902
نویسندگان
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