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 multihydroxyl 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.
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Abstract of article is published in Zhurnal Prikladnoi Spektroskopii, Vol. 87, No. 5, p. 848, September–October, 2020.
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Yuan, H., Li, Y., Zhang, Y. et al. UV-Vis Spectral Properties of Water-Soluble 3,5-bis-(2,4,6-tri-hydroxyphenylazo)benzoic Acid and their Application for pH Detection. J Appl Spectrosc 87, 925–929 (2020). https://doi.org/10.1007/s10812-020-01090-3
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DOI: https://doi.org/10.1007/s10812-020-01090-3