Rational Design of a New AIE‐Coupled ESIPT‐Based Multi‐chromic State Depended Organo‐luminophore With Turn‐on Emissive Response to Zn(II) in Aqueous and Solid‐state

A newly designed multifunctional AIE‐coupled excited‐state intramolecular proton transfer (ESIPT)‐active asymmetric multichromicfluorophor (MCF) has been synthesized and characterized. From tedious experimental spectroscopic dissection of the photophysical properties of MCF and two supporting compou...

Full description

Saved in:
Bibliographic Details
Published in:ChemistrySelect (Weinheim) 2022-01, Vol.7 (1), p.n/a
Main Authors: Mondal, Asit, Ahmmed, Ejaj, Ball, Biswajit, Chattopadhyay, Pabitra
Format: Article
Language:English
Subjects:
AIE
ESIPT
Solid state fluorescence
State Depended Emission (SDE)
Zn2+ ion sensor
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A newly designed multifunctional AIE‐coupled excited‐state intramolecular proton transfer (ESIPT)‐active asymmetric multichromicfluorophor (MCF) has been synthesized and characterized. From tedious experimental spectroscopic dissection of the photophysical properties of MCF and two supporting compounds, (3‐benzotriazol‐2‐yl‐2‐hydroxy‐5‐methyl‐benzaldehyde) (R1) and (2‐benzotriazol‐2‐yl‐4‐methyl‐phenol) (R2)with theoretical discussion, it has been established that ESIPT was driven exclusively towards triazole N centre involving a 6‐member H‐bonded network over imine‐N center in both solid state and solution phase. The competition of aggregation enhanced emissive feature and ACQ (aggregation caused quenching) nature of MCF were also studied thoroughly in the THF/water mixture. New classes of mechanisms are introduced regarding AIE/ACQ phenomenon, which will eradicate the limitation of designing and development of novel solid state emitters. To the best of our knowledge, this unique feature has never been achieved before. Furthermore, reversible mechanochromic fluorescence behavior upon external grinding and acidochromism nature of MCF as acid‐base switch has also been observed. In addition, MCF selectively senses Zn2+ ion through a colorimetric and fluorescence “turn‐on” route. The actual binding site of Zn2+ with MCF has also been established with the help of spectroscopic studies. The present study will enlighten for a new way to achieve new multifunctional organic luminescent solids. An AIE‐coupled ESIPT‐active MCF has been ascertained as a multifunctionalorgano‐luminophor. ESIPTprocess occurstowards triazole N centre through the formation of a 6‐member H‐bonded network in solid state as well as in the solution phase exclusively ignoring the alternative way of occurrence of a 6‐member H‐bonded network towards imine ‘N’ in MCF. A newplausiblemechanism regarding AIE/ACQ phenomenon i. e. state dependent emission (SDE) has been proposed and it mightfacilitate the scientific community to develop new solid state luminophors.
ISSN:2365-6549
2365-6549
DOI:10.1002/slct.202103857