Subtle structural variation in azine/imine derivatives controls Zn2+ sensitivity: ESIPT-CHEF combination for nano-molar detection of Zn2+ with DFT support
| Autor: | Sudeshna Chatterjee, Debasis Das, Sabyasachi Ta, Milan Ghosh, Somnath Khanra |
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| Rok vydání: | 2019 |
| Předmět: |
Detection limit
Proton Chemistry General Chemical Engineering Imine 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Fluorescence 0104 chemical sciences Structural variation Azine chemistry.chemical_compound Crystallography Nano Molecule 0210 nano-technology |
| Zdroj: | RSC Advances. 9:21302-21310 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c9ra03652k |
| Popis: | Excited-state intra-molecular proton transfer (ESIPT)-active imine and azine derivatives, structurally characterised by XRD, and denoted L1, L2, L3 and L4, possess weak fluorescence. The interaction of these probes with Zn2+ turns ON the fluorescence to allow its nano-molar detection. Among the four ESIPT-active molecules, L2, L3 and L4 are bis-imine derivatives while L1 is a mono-imine derivative. Among the three bis-imine derivatives, one is symmetric (L3) while L2 and L4 are unsymmetrical. The lowest detection limits (DL) of L1, L2, L3 and L4 for Zn2+ are 32.66 nM, 36.16 nM, 15.20 nM and 33.50 nM respectively. All the probes bind Zn2+ (105 M−1 order) strongly. Computational studies explore the orbital level interactions responsible for the associated photo-physical processes. |
| Databáze: | OpenAIRE |
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