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Two novel pH-sensitive colorimetric sensors based on a D–π–A heterocyclic azo chromosphere (D1, D2) were designed and synthesized. They contained a nitro group as an electron-withdrawing group (A), a naphthalene of coupling component as an electron-donating unit (D), and –SO 3 Na as water-soluble group. The electron-donating and electron-accepting groups were connected by an azo π-conjugated...
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