کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
26708 43972 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Solvent impact on the photophysical properties and excited state behavior of p-aminobenzoic acids
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Solvent impact on the photophysical properties and excited state behavior of p-aminobenzoic acids
چکیده انگلیسی


• The impact of solvent on photo-induced charge transfer is analysed.
• The quantum yield of two derivatives is determined in different solvents.
• Carbonyl stretching (IR) modes shift in protic solvents.
• In methanol there is a thermodynamic barrier, but none in aprotic solvents.

The photophysical properties of p-aminobenzoic acid and dimethyl-p-aminobenzoic acid are compared in a range of solvents. The electronic spectra are used to determine quantum efficiencies and evaluate excited state behavior. The latter system is found to undergo a charge transfer following photoexcitation and the thermodynamics for the process are assessed. The strength and type of solvent–solute interaction are important in determining the driving force for the charge transfer, with entropy being dominant in protic solvents and enthalpy in aprotic solvents. Vibrational spectroscopy and calculations provide further insight into the nature of the specific solvent–solute interactions, with shifts in the infrared spectrum observed due to hydrogen bonding interactions with the solvent.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 305, 1 June 2015, Pages 60–66
نویسندگان
, , , ,