For the characterization of caffeine de-ionized water and
dichloromethane were used. A mass of 5.03 104 g caffeine
dissolved in 23.07 cm3 de-ionized water
(c = 109.72 103 mol m3) and a caffeine of mass
3.05 104 g dissolved in 15.19 cm3 of dichloromethane (c = 103.37 103 mol m3) were stirred for 1 h using
magnetic stirrer. The absorbance of the solutions was measured
by UV/vis spectrophotometer at room temperature.
From the absorbance molar decadic absorption coefficient
and transitional dipole moment of caffeine in water and
dichloromethane were, respectively, obtained.