A pH indicator, sodium 1-(4-N,N-dimethylaminophenylazo)-2-trifluoromethyl-4-benzenesulfonate, has been prepared, which makes it possible to measure using two kinds of spectroscopy, i.e.19F NMR and VIS spectroscopy.
K. Hamada, T. Hirano, M. Mitsuishi, M. Ohira and K. Mesuda, J. Chem. Soc., Chem. Commun., 1994, 693 DOI: 10.1039/C39940000693
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