Abstract

Triarylboron/acridine hybrids bearing donor-acceptor structures were designed and synthesized. After simply modifying the acridine with additional phenyl groups, the novel compound was utilized as fluorescent probe for the detection of fluoride ion. The original green emission was quenched and intense deep-blue emission emerged simultaneously when reacted with F−. According to the DFT calculation result, the deep-blue emission originates from the phenyl modified DMAc groups that expand the π conjugate system of electronic delocalization. Based on the fluorescence spectra intensity variation of deep-blue emission with different concertation of F−, the detection limit of the probe is approximately 10−8 M, which is decreased by two orders of magnitude compared with that of the non-phenyl group modified counterpart. The “turn off/turn on” property endows the probe with high sensitivity, good selectivity and reversibility.

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