A methoxy substituted HBT derivative 2-(benzo[d]thiazol-2-yl)-6-methoxyphenol (TMP) showed coupling of AIE and ESIPT, underwent FRET with Rhodamine B and detected Sulfide in pure water by ratiometry.
Photophysical properties of a synthesized asymmetric two-way proton transfer molecule
3-(benzo[d]thiazol-2-yl)-2-hydroxy-5-methoxybenzaldehyde
(BTHMB) were studied in detail. BTHMB could
undergo excited-state intramolecular proton transfer (ESIPT) involving
a 6-membered H-bonded network toward either the N or the O atom present in the molecule as proton
acceptors. From tedious spectroscopic dissection, however, it was
established that ESIPT was driven exclusively toward the N center
over the O center in the solid state as well as in the solution phase.
The aforementioned deduction was based on spectral comparison with
judicially designed molecules 2-hydroxy-5-methoxybenzaldehyde (HMB) and 2-(benzo[d]thiazol-2-yl)-4-methoxyphenol
(BTMP). In solution, the coexistence of the anionic and
neutral forms of BTHMB in basic solvents dimethylsulfoxide
(DMSO) and dimethylformamide (DMF) enables BTHMB to behave
as a white light emitter. Thus, apart from establishment of directionality
of ESIPT in double ESIPT probes, the current work deserves special
merit as BTHMB can be considered as a standard in future
designs involving red light and solvent-specific white light emitters.
Harvesting solar light efficiently and effective photo‐induced charge separated photocatalysts becoming an immense demand for environment salvation. Herein, the one‐step solvothermal method has been employed to synthesize Zn1–xRuxS nanoparticles (NPs). A systematic study for the photocatalytic degradation of Methylene blue (MB) for the first time in Ru doped ZnS system has been carried out with visible light (LED) irradiation. Density functional theory has been employed to study the structural, electronic properties and charge transfer mechanism throughout the Ru doped ZnS system. Theoretical results and UV‐Vis spectra suggest a reduction of bandgap as a function of Ru concentration. Bader charge analysis for both the structures as well as photoluminescence quenching has shown Ru acts as a charge center in the charge transfer process. The optimum photodegradation efficiency is achieved in case of 1% Ru doped ZnS NPs. Thus Ru doping in ZnS NPs has a significant role in showing effective photocatalytic behaviour.
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