X- ray single crystal structure, spectroscopic and photophysical parameters of the titled compound were studied. Photophysical parameters include singlet electronic absorption, molar absorption coefficient, oscillator strength and dipole moment of electronic transition, fluorescence spectra, excited state lifetime and fluorescence quantum yield for PPPBB in different solvents. PPPBB displays a little change in maximum absorption and emission spectra with solvent polarity, indicating a slight change in dipole moment of dye molecules upon excitation. The dipole moments (Δ\(\mu\) ) difference between the excited and ground state was obtained from Lippert-Mataga method. Ground and electronic excited states geometric optimization was performed using density functional theory (DFT) and time-dependent density functional theory (TD-DFT), complemented with spectral findings. A good agreement between theoretical data and experimental observations was found. The net photochemical quantum yield (ϕc) of PPPBB dye was calculated in various solvents.
The Super-efficient fluorescence quenching of the dye, 1-(E)-styryl-2-(4-(2-(E)-styrylphenoxy) butoxy) benzene (alkoxy bridged styryl benzene) (PPPBB), by silver and gold nanoparticles (Ag NPs and Au NPs) are explored by the steady-state fluorescence measurements in methanol and ethylene glycol (MeOH and EG). The data showed that both radiative and non-radiative energy-transfer perform a key role in the fluorescence super-quenching mechanism. The Stern–Volmer quenching constants (Ksv) were calculated as 1.4 \(\times\) 1010, 1.2 \(\times\) 1010 M− 1 in MeOH and EG for Ag NPs, and 2.69 \(\times\) 108, 6.18 \(\times\) 109 M− 1 in MeOH and EG for Au NPs, respectively. Besides, the quenching sphere radius (r) values were calculated, via Perrin model of quenching, as 160,161 nm in MeOH and EG for Ag NPs, and 45, 85 nm in MeOH and EG for Au NPs, respectively. From active sphere radius results, one can conclude that the fluorescence resonance energy-transfer is responsible for super-quenching of PPPBB. Moreover, the fluorescence energy-transfer had an observable effect on the fluorescence super-quenching of PPPBB by AgNPs and AuNPs in EG more than in MeOH. These Super-quenching processes can pave the way for the usage of (PPPBB/ NPs) quenching systems in the energy transfer-based biosensors and essays with high degree of sensitivity.
X- ray single crystal structure, spectroscopic and photophysical parameters of the titled compound were studied. The titled compound shows thermal stability prior to melting at 126.17 °C with ΔH value of 109.991 Jg<sup>-1</sup>. Photophysical parameters include singlet electronic absorption, molar absorption coefficient, oscillator strength and dipole moment of electronic transition, fluorescence spectra, excited state lifetime and fluorescence quantum yield for PPPBB in different solvents. PPPBB displays a little change in maximum absorption and emission spectra with solvent polarity, indicating a slight change in dipole moment of dye molecules upon excitation. The dipole moments (Δμ ) difference between the excited and ground state was obtained from Lippert-Mataga method. Ground and electronic excited states geometric optimization was performed using density functional theory (DFT) and time-dependent density functional theory (TD-DFT), complemented with spectral findings. A good agreement between theoretical data and experimental observations was found. The net photochemical quantum yield (ϕ<sub>c</sub>) of PPPBB dye was calculated in various solvents.
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