Experimental Determination of the Dipole Moments of Organic Molecules in Excited Electronic States

Bakhshiev, N. G.; Knyazhanskii, M. I.; Минкин, Владимир И.; Osipov, O. A.; Saidov, G. V.

doi:10.1070/rc1969v038n09abeh001831

Cited by 69 publications

(28 citation statements)

References 3 publications

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“…Our data supplemented by the previously reported data on the Stokes shift (ν abs − ν lum ) for C334 versus the value f ( n , ε ) (Equation ), which enters into the Bilot‐Kawski equation, obey a linear

f ((),, n, ε) = ([], \frac{ε - 1}{ε + 2} - \frac{n^{2} - 1}{n^{2} + 2}) \times \frac{2 n^{2} + 1}{n^{2} + 2},

dependence ( R 2 = 0.942) expressed by Equation , in which a = 1032 сm −1 (Figure ). This signifies the

ν_{abs} - ν_{lum} = a f ((),, n, ε) + italicconst,

effect of dipole‐dipole interactions between the luminophore molecules and the microenvironment on the luminescence of coumarins.…”

Section: Resultssupporting

confidence: 76%

Exploring the utility of coumarins‐based luminescent spectra converters

Lapina

Павич

Першукевич

et al. 2017

J of Physical Organic Chem

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The physicochemical aspects of functioning the luminescent converters for a rational modification of the emission spectra of light-emitting diodes are considered. These converters use laser dyes' coumarins 314, 334, and 343 to transfigure the primary light-emitting diode spectrum. The fine control of the emission spectra of the mentioned coumarins in polymeric matrices was achieved by introducing nonionic detergents. The relevant characteristics of the photochemical persistence of coumarins in the polymer layers are acquired.

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f ((),, n, ε) = ([], \frac{ε - 1}{ε + 2} - \frac{n^{2} - 1}{n^{2} + 2}) \times \frac{2 n^{2} + 1}{n^{2} + 2},

dependence ( R 2 = 0.942) expressed by Equation , in which a = 1032 сm −1 (Figure ). This signifies the

ν_{abs} - ν_{lum} = a f ((),, n, ε) + italicconst,

effect of dipole‐dipole interactions between the luminophore molecules and the microenvironment on the luminescence of coumarins.…”

Section: Resultssupporting

confidence: 76%

Exploring the utility of coumarins‐based luminescent spectra converters

Lapina

Павич

Першукевич

et al. 2017

J of Physical Organic Chem

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“…General solvent effects are commonly rationalized using Lippert [45] or Bakhshiev et al [46] models. Bakhshiev's solvatochromic parameter ðS B Þ is given by equation (1):…”

Section: Resultsmentioning

confidence: 99%

An experimental and theoretical study on the photophysical properties of methylene green

et al. 2011

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“…Furthermore, Bilot‐Kawshi, Bakshiev and Liptay plots were used to determine the ratio of excited to ground state dipole moment ( μ e /μ g ) and the values acquired are summarized in Table S4 . The ratio ( μ e /μ g ) calculated on the basis of the above plots are greater than unity for each fluorophore, indicative of more polar excited state than the ground state ( Table S4 ).…”

Section: Resultsmentioning

confidence: 99%

N‐Ethyl Carbazole Derived D‐π‐A‐π‐D Based Fluorophores: Consolidated Spectroscopic, Viscosity and DFT Studies

2019

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This article reports design and synthesis of three new fluorophores (5 a‐c) with the donor‐π‐acceptor‐π‐donor motif, where dicyano vinylene group is the central acceptor, N‐ethyl carbazole group is a fixed donor and varying the N‐substituted secondary donors so as to study their photophysical behavior. Based on the systematic photophysical and theoretical reconnaissances, the fluorophores structure‐property relationships are defined. Their spectral and photophysical behaviors are affected by the solvent polarity, with a significant bathochromic shift in emission and large Stoke shifts being observed in polar solvents. Contrary to dipolar asymmetric analogue this system shows an efficient intramolecular charge transfer as observed from various solvent polarity plots. For 5 a, 5 b, and 5 c, the viscosity induced emission studies show respectively 3.78, 6.53, and 6.82 times enhancement in their fluorescence intensity and hence act as a fluorescent molecular rotor (FMR). The structure and electronic properties of these fluorophores were evaluated using density functional theory computations using B3LYP/6‐311++G(d,p). The frontier molecular orbitals and the optimized geometry reveal that secondary donors in each fluorophore donate the electron and not the N‐ethyl carbazole group which is more twisted. The non‐linear and linear optical properties were determined employing solvatochromic and computational methods in solvents of varying polarities with results falling within the expected limiting values. The linear and non‐linear optical properties of the fluorophores change with the strength of different secondary donors used and solvent polarity. The two photon absorption cross‐section described using two level approximation is highest for 5 b (115‐172 GM).

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Experimental Determination of the Dipole Moments of Organic Molecules in Excited Electronic States

Cited by 69 publications

References 3 publications

Exploring the utility of coumarins‐based luminescent spectra converters

Exploring the utility of coumarins‐based luminescent spectra converters

An experimental and theoretical study on the photophysical properties of methylene green

N‐Ethyl Carbazole Derived D‐π‐A‐π‐D Based Fluorophores: Consolidated Spectroscopic, Viscosity and DFT Studies

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