Deciphering the Photophysical Properties of Nonplanar Heterocyclic Compounds in Different Polarity Environments

The Journal of Physical Chemistry B, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 15, 2025

Nonplanar (butterfly-shaped) phenothiazine (PTZ) and its derivative's (M-PTZ) photophysical spectral properties have been tuned by varying the solvents their polarity investigated employing spectroscopic techniques such as UV-Vis, steady-state time-resolved fluorescence, TDDFT calculations. The UV-Vis absorption studies calculations reveal two distinct bands for both compounds: a strong π-π* transition at shorter wavelengths weaker n-π* transition, which displays little bathochromic shift in polar solvents. detailed emission that dual is result of photoinduced excited-state conjugation enhancement (ESCE) process. band wavelength corresponds to locally excited (LE) state, while longer arises from planarized state resulting ESCE. With increase solvent polarity, LE less affected, whereas positive solvatochromism observed ESCE band. As increases, demonstrates significant solvatochromism, intensity decreases with higher suggesting stabilization state. biexponential decay fluorescence lifetimes further corroborates behavior PTZ M-PTZ. exhibits photoluminescence quantum yield (PLQY) than M-PTZ, viscosity influences PLQY, indicating nonradiative activated during planarization also known enhancement. Furthermore, (time-dependent) density functional theory (TD) DFT performed understand geometrical parameters electronic transitions these model molecules corroborate experimental findings. These findings underscore influence molecular structure on dynamics eventually hold substantial implications advanced applications.

Language: Английский

Emerging chiral sulfur-nanomaterials for chiroptical application

Nanoscale, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

This review covers fundamental principles and techniques for measuring chiral properties as well the synthesis of sulfur-based nanomaterials, their optical chiroptical properties, possible applications.

Language: Английский