期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 173, 期 -, 页码 225-233出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.06.093
关键词
Diketopyrrolopyrrole; Fluoride sensor; Colorimetric; Dual mode fluorescence; Logic gate
资金
- NSFC/China [2116110444, 21172073, 20902024]
- National Basic Research 973 Program [2011CB808400]
- Fundamental Research Funds for the Central Universities [WJ0913001, WJ1014001]
- Shanghai Talent Program
- Ph.D. Programs Foundation of Ministry of Education of China [20090074110004]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [200957]
- Shanghai Pujiang Talent Program [10PJ1402700]
- Fok Ying Tong Education Foundation [121069]
- Shanghai Chenguang project [09CG26]
A new red-emission diketopyrrolopyrrole (DPP)-based fluoride ion chemosensor (DPP-4) with two strong electron-donating triphenylamine groups was designed and synthesized. The sensing properties of DPP-4 for F- were extensively investigated both in acetone and in acetonitrile solutions. Deprotonation of the N-H groups on DPP-4 provided rapid and selective detection of F- in which an apparent color change from red to purple with large red shift in ambient light can be observed by the naked-eye in both two solvents. However, very distinct sensing behaviors were obtained in the fluorescent changes exhibiting solvent-dependent dual mode approaches, i.e. ratiometric and turn on modes in acetone and acetonitrile, respectively. In acetone, ratiometric channel was activated upon addition of n-Bu4NF, and more than 50 nm red shift from 590 nm to 641 nm was obtained and accompanied with emission color from orange to purple red. In acetonitrile, a turn on response with red emission at 631 nm can be easily recognized, and more than 50-fold enhancement were obtained. TD-DFT calculations indicated that DPP-4 performed an intramolecular charge transfer (ICT) process between triphenylamine to DPP core. Interestingly, the reverse charge transfer process from deprotonated DPP core to triphenylamine moieties was obtained after addition of F-, which resulted in red-shift in absorption spectra of the compound. Furthermore, using fluoride and HSO4- anions as two chemical inputs and absorption or fluorescence as output, compound DPP-4 was demonstrated to be a parallel double-INH logic gate in acetonitrile solution. (C) 2012 Published by Elsevier B.V.
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