Add time:09/09/2019         Source:sciencedirect.com

A simple fluorescent schiff base, X, based on imidazo[2,1-b]thiazole-6-carboxylic acid and 3-ethoxy-2-hydroxybenzaldehyde, was designed and synthesized for detection of Zn2+ and PPi. X showed excellent sensitivity and selectivity toward Zn2+ by exhibiting a large fluorescence enhancement (about 42 times). The binding ratio of the X and Zn2+ was 1:1 confirmed by mass spectral analysis and Job’s plot and the association constant between X and Zn2+ was calculated to be 2.2 × 105 M−1. The detection limit was as low as 1.2 × 10-9 M. Moreover, the X[Zn2+] complex could be used as a sensor to detect PPi sensitively and the detection limit was 1.9 × 10-9 M. Furthermore, the fluorescent signals of X were utilized to construct an INHIBIT logic gate at the molecular level. The reason of fluorescence enhancement of X toward Zn2+ was verified by density functional theory (DFT) and time-dependent density functional theory (TDDFT) calculations using Gaussian 09.

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