Aggregation Induced Emission-Excited State Intramolecular Proton Transfer based “Off-On” Fluorescent Sensor for Al3+ Ions in Liquid and Solid State
Area/Stream: Materials Science, Authors: Gulshan Kumar, Kamaldeep Paul, Vijay Luxami Keywords: ESIPT, AIE, Azine, Schiff base, ChemosensorJournal Name: Sensors and Actuators B: Chemical Year:2018, Month:June, Volume: 263, Issue: Page No: 585-593, ISSN: 0925-4005, DOI/Link: https://www.sciencedirect.com/science/article/abs/pii/S0925400518303563?via%3DihubAbstract:
Benzophenone azine based schiff base exhibiting AIE and ESIPT phenomenon has been synthesised and studied the photophysical behaviour towards detection of Al3+ ions. The results showed that compound 2 exhibit feeble excited state intramolecular proton transfer emission in CH3CN and undergo aggregation induced emission in >70% H2O-CH3CN. The compound 2 shows significant hydrodynamic diameter change from 20 nm to 200 nm upon increasing the H2O volume ratio in CH3CN. Compound 2 shows colorimetric and “off-on” emission response for Al3+, with detection limit of 2.7×10−7M in CH3OH. The association of compound 2 to Al3+ also causes restriction in intramolecular motion induced emission. The hydrodynamic diameter of compound 2 increases from 335 nm to 625 nm in the presence of Al3+ ion in CH3OH.
