Abstract
In this work we studied the photoluminescence (PL) behaviour of a new intramolecular charge transfer (ICT) compound, DHAIA. It shows ICT solvent effect in common organic solvents and specific solvent effect in aqueous medium as confirmed by its spectra characterization. The specific solvent effect can be ascribed to the transition from charge-transfer (CT) state to locally excited (LE) state, which is activated by intermolecular hydrogen bonding. The proposed mechanism was confirmed by DFT calculations. The compound can serve as a reliable sensor for identifying the brand of liquors and confirming their authenticity, based on such unique solvent effect intrinsic to this fluorogen. The sensor aimed to fingerprint different liquors via plotting their characteristic factors recorded by spectroscopic analysis. It succeeded in identifying an adulterated liquor sample, once commercially available, provided by Municipal Public Security Bureau, showing great potential in liquor differentiation and identification.
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