Photo physical properties of Caffeine and cu (ii)-caffeine Complex
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Date
2007-09
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Addis Ababa University
Abstract
In this thesis UV/Vis absorption spectra of caffeine in water and dichloromethane, copper
sulphate, and mixture of caffeine and copper sulphate in water solution is investigated.
UV/Vis absorption spectrum of Cu (II)-Caffeine complex is also investigated as a
function of time during refluxing to check complex formation. The molar decadic
absorption coefficient of caffeine is calculated. Fluorescence emission spectra of Cu (II)-
Caffeine complex is also investigated and compared with its absorption band. Area
normalization analysis method is used. Finally, a better derivative fluorescence method
for determination of caffeine content of substances is recommended
Key words: Absorbance, Molar decadic absorption coefficient, Reflux, Complex
formation, Derivative Fluorescence, Is-emission point, Area normalization
Description
Keywords
Absorbance, Molar Decadic Absorption Coefficient, Reflux, Complex Formation, Derivative Fluorescence, Is-Emission Point, Area Normalization