The Δδ N for 3 and 4 are quite significant for the β-azo nitrogen atom, with shifts of 216 nm and 243 ppm.
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Water-Soluble Colorimetric Amino[<i>bis</i>(ethanesulfonate)] Azobenzene pH Indicators: A UV-Vis Absorption, DFT, and <sup>1</sup>H-<sup>15</sup>N NMR Spectroscopy Study.
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