Citation:
BAO Xia, ZHANG Xiao-Ling, WANG Feng-Wu. The Effects of Solvents on UV-Vis Spectra of 5-Br-PADAP[J]. Chinese Journal of Applied Chemistry,
;2006, 23(7): 757-761.
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The UV-Vis absorption spectra of 2-[2-(5-bromo-pyridyl)azo]-5-(diethylamino) phenol(5-Br-PADAP) in various solvents were studied.It was found that both the spectra shape and peak wavelength of 5-Br-PADAP are remarkably sensitive to the nature of the solvent in which it is measured and the concentration of the dye itself.In methanol,1×10-5 mol/L of 5-Br-PADAP exhibited a dramatic red-shift in comparison with that in "normal" solvents(alcohols,water,etc.).The absorption spectra also changed with the concentration of 5-Br-PADAP,and the change trend is identical with that of resonance light scattering.The concentration where the main absorption peak changed to minor one was in accord with that where the peak of resonance light scattering appeared.The 1H NMR spectra of 5-Br-PADAP in different solvents were also quite different.The mechanism of the spectra change of 5-Br-PADAP was discussed.
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Keywords:
- Br-PADAP,
- solvent efffect,
- absorption spectra,
- resonance light,
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