UV-VIS SPECTRAL PROPERTIES OF WATER-SOLUBLE 3,5-BIS-(2,4,6-TRI-HYDROXYPHENYLAZO)BENZOIC ACID AND THEIR APPLICATION FOR pH DETECTION
Abstract
We present a multiple water-soluble azo dye with a D-π-A-π-D conjugated structure, 3,5-bis-(2,4,6- trihydroxyphenylazo)benzoic acid (THPBA) developed using phloroglucinol as the electron-donating group, benzoic acid as the electron-accepting one, and the azo double bond as the bridging one. The UV-Vis spectral properties of the elaborated structure as well as its spectral response to the pH are investigated in detail. The results show that the present THPBA, combining carboxyl, azo, and multi-hydroxyl groups, possesses excellent UV-vis spectra (εmax = 2.794×104 –2.115×104 L/mol·cm) with changing pH values and solvents. Especially in DMF-H2O (v/v=1:9), there is an obvious spectral response for THPBA to pH in the linear range 5.2–7.5, which is successfully applied to detect pH values in aqueous and commercial fruit juice samples.
Keywords
3,5-bis-(2,4,6-trihydroxyphenylazo)benzoic acid,
UV-vis spectral properties,
pH detection,
environmental analysis
Supporting agencies: The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (No. 21806089) and the Natural Science Foundation of the Shandong Province (No. ZR2018MB038).
About the Authors
Hua Yuan
School of Chemistry and Chemical Engineering, Qufu Normal University
China
Qufu 273165
China
Qufu 273165
Yixuan Li
School of Chemistry and Chemical Engineering, Qufu Normal University
China
Qufu 273165
China
Qufu 273165
Yanyan Zhang
School of Chemistry and Chemical Engineering, Qufu Normal University
China
Qufu 273165
China
Qufu 273165
Shuo Liu
School of Chemistry and Chemical Engineering, Qufu Normal University
China
Qufu 273165
China
Qufu 273165
Junkai Hao
School of Chemistry and Chemical Engineering, Qufu Normal University
China
Qufu 273165
China
Qufu 273165
Lei Hu
School of Chemistry and Chemical Engineering, Qufu Normal University
China
Qufu 273165
China
Qufu 273165
Wenli Yao
Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology
China
Ganzhou 341000
China
Ganzhou 341000
Zhengquan Yan
School of Chemistry and Chemical Engineering, Qufu Normal University
China
Qufu 273165
China
Qufu 273165
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Review
For citations:
Yuan H., Li Y., Zhang Ya., Liu Sh., Hao J., Hu L., Yao W., Yan Zh. UV-VIS SPECTRAL PROPERTIES OF WATER-SOLUBLE 3,5-BIS-(2,4,6-TRI-HYDROXYPHENYLAZO)BENZOIC ACID AND THEIR APPLICATION FOR pH DETECTION. Zhurnal Prikladnoii Spektroskopii. 2020;87(5):848(1)-848(5).
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