scholarly journals Effect of solvent polarity on the photophysical properties of chalcone derivatives

RSC Advances ◽  
2017 ◽  
Vol 7 (39) ◽  
pp. 24204-24214 ◽  
Author(s):  
Rekha Kumari ◽  
Anitha Varghese ◽  
Louis George ◽  
Sudhakar Y. N.
Keyword(s):  
Excited State ◽  
Organic Solvents ◽  
Ground State ◽  
Photophysical Properties ◽  
Solvent Polarity ◽  
Chalcone Derivatives ◽  
Effect Of Solvent

The photophysical properties were studied for FNPO, AFPO and FHPO in different organic solvents. The excited state of the molecules were found to be more polar than the ground state.

scholarly journals Studies on Photophysical Properties of Mono-carbonyl Curcumin Analogues: Experimental and Theoretical approach

2018 ◽  
Vol 34 (4) ◽  
pp. 2170-2179
Author(s):  
Manjula Rayanal ◽  
Prasad Pralhad Pujar ◽  
Sridhar D
Keyword(s):  
Excited State ◽  
Ground State ◽  
Dipole Moments ◽  
Photophysical Properties ◽  
Stokes Shift ◽  
Solvent Polarity ◽  
Frontier Molecular Orbital ◽  
Curcumin Analogues ◽  
Td Dft ◽  
Ground State Dipole Moments

The solvatochromic fluorescence behaviour of mono-carbonyl curcumin analogues has been studied in ten different solvents ranging from non-polar to polar. The solvent effect on the spectral properties of analogues has been discussed. The ground state dipole moments were estimated experimentally by Bilot-Kawski equation which is a function of Stokes shift with the solvent polarity parameters and Guggenheim method and theoretically by TD-DFT studies. The excited state dipole moment was determined using Bilot-Kawski equations. The excited state dipole moments for the two molecules were found to be higher than their corresponding ground state dipole moments. Theoretically Frontier molecular orbital (HOMO/ LUMO) energies were determined by Gaussian 09 W software using TD-DFT.

scholarly journals Correction: Photophysical properties of the intramolecular excited charge-transfer states of π-expanded styryl phenanthrimidazoles – effect of solvent polarity

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 83709-83709
Author(s):  
V. Thanikachalam ◽  
A. Arunpandiyan ◽  
J. Jayabharathi ◽  
P. Ramanathan
Keyword(s):  
Charge Transfer ◽  
Photophysical Properties ◽  
Solvent Polarity ◽  
Effect Of Solvent

Correction for ‘Photophysical properties of the intramolecular excited charge-transfer states of π-expanded styryl phenanthrimidazoles – effect of solvent polarity’ by V. Thanikachalam et al., RSC Adv., 2014, 4, 6790–6806.

Experimental and theoretical insights on the effect of solvent polarity on the photophysical properties of a benzanthrone dye

2019 ◽  
Vol 218 ◽  
pp. 221-228 ◽  
Author(s):  
Shivraj ◽  
B. Siddlingeshwar ◽  
Anup Thomas ◽  
Elena M. Kirilova ◽  
Darshan Devang Divakar ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Solvent Polarity ◽  
Effect Of Solvent

scholarly journals Complexes of a naphthalimide photoacid with organic bases, and their excited-state dynamics in polar aprotic organic solvents

2015 ◽  
Vol 17 (32) ◽  
pp. 20715-20724 ◽  
Author(s):  
Tatu Kumpulainen ◽  
Bert H. Bakker ◽  
Albert M. Brouwer
Keyword(s):  
Excited State ◽  
Organic Solvents ◽  
Ground State ◽  
Ion Pair ◽  
Excited State Dynamics ◽  
Organic Bases ◽  
P Addition

Addition of a base to a solution of a photoacid in aprotic organic solvents results in the formation of ground-state complexes, which upon excitation dissociate via intermediate ion pair species.

scholarly journals A semi-empirical estimation of ground and excited state dipole moments of zinc phthalocyanine from solvatochromic shift data

2018 ◽  
Vol 6 (2) ◽  
pp. 190
Author(s):  
Abimbola Ogunsipe
Keyword(s):  
Excited State ◽  
Ground State ◽  
Dipole Moments ◽  
Solvent Polarity ◽  
Zinc Phthalocyanine ◽  
Empirical Estimation ◽  
Solvatochromic Shift ◽  
Excited State Dipole Moments ◽  
Semi Empirical ◽  
Ground State Dipole Moments

A semi-empirical determination of ground and excited state dipole moments of zinc phthalocyanine (ZnPc) from solvatochromic shifts is hereby presented. The ratio of the excited- and ground-state dipole moments of ZnPc ( ) was estimated by a combination of the Bakshiev and the Kawski-Chamma-Viallet’s equations, while the difference in the excited- and ground-state dipole moments (Dm) was estimated usingthe molecular-microscopic solvent polarity parameters ( ), alongside the Stokes’ shifts (Dῡ) in the various solvents. The dipole moment of ZnPc is significantly higher in the excited singlet state (me = 3.12 D) than in the ground state (mg = 1.50 D). Obviously charge separation is greater in the excited state of ZnPc than in its ground state.  

Dipole moments and quenching of fluorescence of a new coumarin dye

2020 ◽  
Vol 98 (8) ◽  
pp. 761-769
Author(s):  
Omnath Patil ◽  
P.K. Ingalagondi ◽  
Shivaraj Gounhalli ◽  
S.M. Hanagodimath
Keyword(s):  
Activation Energy ◽  
Excited State ◽  
Ground State ◽  
Density Functional ◽  
Dipole Moments ◽  
Fluorescence Emission ◽  
Solvent Polarity ◽  
Chemical Hardness ◽  
Fluorescence Emission Spectra ◽  
Coumarin Dye

The absorption and fluorescence emission spectra of a newly synthesized laser grade coumarin dye, 1-((4-methoxyphenoxy) methyl)-3H-benzo[f]chromen-3-one (4-MPMBC), have been recorded in various solvents having different polarities. The spectrum peak was found to shift toward a higher wavelength with an increase in the solvent polarity. The dipole moments of the ground state (μg) and excited state (μe) were estimated using the Lippert, Bakshiev, and Kawski–Chamma–Viallet equations. The μe values were found to be greater than the μg values in all solvents, indicating that the dye is more polar in the excited state than in the ground state. The absorption maximum and emission maximum energies, ground- and excited-state dipole moments, and HOMO–LUMO energy gaps were estimated using Gaussian 16W. These have been compared with the experimental results. The estimated chemical hardness of the dye molecule indicates the soft nature in all of the solvents. The reactive centers such as nucleophilic and electrophilic sites were identified along with contour action using electrostatic potential three-dimensional map density functional theory analysis. The fluorescence quenching has been studied in solvents of varying polarities using aniline as a quencher. The quenching process was found to follow the Stern–Volmer equation and was studied by considering the role of diffusion. In all solvents, the probability of quenching per encounter (p) was found to be less than unity. The activation energy for diffusion and activation energy for quenching were estimated using the values of p.

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