کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5402783 | 1392741 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biphenyl-type sensing system in proton-rich environment by fluorescence and quantum-chemical calculations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Biphenyl derivative N-allyl-Nâ²-(4â²-nitro[1,1â²-biphenyl]-4-yl)thiourea (BP1) was synthesized as a functional fluorescent sensor for protons and their photophysical properties were studied. The influence of environment protonation on photophysical properties of the biphenyls in solutions was investigated using UV absorption, steady-state and time-resolved fluorescence spectroscopy. Semi-empirical and DFT calculations and optimization of the molecular structure of the biphenyl derivatives in vacuum, in polar solvents and in a proton-rich environment were conducted using the HyperChem, Amsol and Gaussian3 software package. Fluorescence quenching with addition of acidic acid was observed and the Stern-Volmer quenching rate constant was about 3.0Ã109Â Mâ1Â sâ1. Intermolecular hydrogen bonds formations by the protons with the sulphur being substituted to the biphenyls generate charge movement and strong increase (Ã5) of the dipole moment of the fluorophore.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 130, Issue 6, June 2010, Pages 1085-1091
Journal: Journal of Luminescence - Volume 130, Issue 6, June 2010, Pages 1085-1091
نویسندگان
Maja Sadowska, Ewa Miller, StanisÅaw Wysocki, Gemma M. RodrÃguez-Muniz, Ana M. Costero, Barbara Wandelt,