Open AccessSpectrophysics of Coumarin-Based Chromophore
Author(s) -
Faisal Rasool,
Amir Sohail
Publication year - 2022
Publication title -
materials and devices
Language(s) - English
Resource type - Journals
ISSN - 2495-3911
DOI - 10.23647/ca.md20220327
Subject(s) - intramolecular force , photochemistry , excited state , chemistry , intermolecular force , moiety , reaction rate constant , chromophore , polarizability , hydrogen bond , relaxation (psychology) , molecule , atomic physics , stereochemistry , organic chemistry , psychology , social psychology , physics , quantum mechanics , kinetics
In this work, we comprehensively explore the spectral and photophysical properties of a coumarin-based dye (1) in neat solvents. The modulation of stokes shifts, emission quantum yields (ФF) and excited-state lifetimes of 1by local environment (polarity, polarizability, viscosity and hydrogen bonding) signifies the formation of intramolecular charge state (ICT) from the amino group to the coumarin moiety. Collectively, in the more viscous polar solvents the rotation of the amino group is restricted, exponentially decreasing the non-radiative rate constants (knr). Keywords :#SPECTROPHYSICS #INTERMOLECULAR_CHARGE_TRANSFER #NON-RADIATIVE_RATE_CONSTANT #EXCITED-STATE_LIFETIME #LOCAL_ENVIRONMENT.