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Solvatochromic dyes of the pyridinium-N-phenoxide family (e.g. Reichardt's dye) have been covalently immobilized on silica substrates with retention of Solvatochromic behaviour, allowing construction of optical chemical sensors using these dyes.
D. Crowther and X. Liu, J. Chem. Soc., Chem. Commun., 1995, 2445 DOI: 10.1039/C39950002445
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