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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. shu

The Effects of Solvents on UV-Vis Spectra of 5-Br-PADAP

1.
a Department of Chemistry, School of Science, Beijing Institute of Technology, Beijing 100081;
2.
b Chemistry Department of Huainan Normal university, Huainan

Corresponding author: ZHANG Xiao-Ling,
Received Date: 2 November 2005
Available Online: 18 February 2006
Fund Project: 安徽省重点科研计划资助项目(0302206) (0302206)

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.
- Br-PADAP,
- solvent efffect,
- absorption spectra,
- resonance light,
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