Electroabsorption spectroscopy of electronic transition for room-temperature ionic liquid molecules dispersed in a polymer matrix

Ito, Ryuichi; Funamoto, Yuuki; Ohta, Nobuhiro; Iimori, Toshifumi

doi:10.1016/j.chemphys.2015.04.017

Cited by 4 publications

(7 citation statements)

References 29 publications

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“…In the EA measurement, the angle (χ) between the electric field of light and the externally applied electric field in PMMA films was controlled as one of the experimental parameters. The angle χ was varied by changing the angle of incidence of the light beam to the surface of the sample substrate and was calculated according to the Snell’s law of refraction. , A rotary stage was used to change the angle of incidence.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…If the second assumption was not true and molecules were not immobilized, the terms that depend on μ g and α gm – α̅ g should contribute to the coefficients A χ and B χ . ,, Here, α gm = m ·α g · m /| m | 2 is the component of the ground-state polarizability along the direction of m , and α̅ g = 1/3Tr( α g ). The terms containing μ g originate from the field-induced orientation of polar molecules, and the terms containing α gm – α̅ g originate from the field-induced alignment due to the polarizability anisotropy of molecules.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The angle χ was varied by changing the angle of incidence of the light beam to the surface of the sample substrate and was calculated according to the Snell's law of refraction. 18,19 A rotary stage was used to change the angle of incidence.…”

Section: Introductionmentioning

confidence: 99%

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Stark Spectroscopy of Rubrene. I. Electroabsorption Spectroscopy and Molecular Parameters

et al. 2016

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Electroabsorption spectroscopy investigation and the determination of molecular parameters for rubrene dispersed in a poly(methyl methacrylate) (PMMA) matrix are reported. The features of the band system in the absorption spectrum in PMMA are analogous to those in solutions. The changes in the electric dipole moment and the polarizability between the excited and ground states are determined from analysis of the Stark effect in the absorption band. The change in the transition dipole moment in the presence of an external electric field is also observed. Although rubrene is predicted to be classified as a nonpolar molecule, there is a contribution of the difference in the electric dipole moment between the excited and ground states to the electroabsorption spectrum. The origin of the nonzero difference in the electric dipole moment is argued. Stark fluorescence spectroscopy investigation is reported in Part II of this series.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Theoretical Backgroundmentioning

confidence: 99%

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Stark Spectroscopy of Rubrene. I. Electroabsorption Spectroscopy and Molecular Parameters

et al. 2016

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“…EA spectra were measured at different χ values by changing the incident angle of the light beam to the sample surface with a rotary stage. χ was calculated according to Snell's law of refraction 40 assuming the reported refractive index for PMMA (n = 1.51). 41 Because the optical path length across the film depends on χ, the absorbance should also increase according to the factor 1/sin χ.…”

Section: Experimental Methodsmentioning

confidence: 99%

Electroabsorption and Stark Fluorescence Spectroscopies of Thioflavin T

2023

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Thioflavin T (ThT) is a typical fluorescent marker for detecting the formation of amyloid fibrils, because its fluorescence intensity increases by more than 2 orders of magnitude upon complexation with the fibrils. Strong electrostatic fields on protein surfaces are known to be a significant factor in chemical reactions and biological functions. Therefore, ThT bound to amyloid fibrils must experience strong electric fields. This study employed electroabsorption and Stark fluorescence spectroscopies to clarify the effects of external electric fields on the photophysics of ThT. The absorption spectrum shows two bands ascribed to locally excited (LE) and charge transfer (CT) states. Coupling between the LE and CT states is enhanced in the presence of an external electric field, resulting in fluorescence quenching. The electric field strength of the amyloid fibril surface was inferred from the fluorescence quenching efficiency of ThT.

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“…For the compensation of the optical path length change across the film with the change in w, 1/sin w was multiplied with the absorbance in fitting the EA spectra. 33 The derivative line shapes of the absorption spectra were calculated numerically. Fitting of the EA and absorption spectra was performed using the curve-fitting function of the IGOR program (WaveMetrics).…”

Section: Experimental Methodsmentioning

confidence: 99%

Charge-transfer state and state mixing in tetracyanoquinodimethane probed using electroabsorption spectroscopy

Islam

Syundo

Iimori

2023

Phys. Chem. Chem. Phys.

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Electroabsorption spectroscopy of electronic transition for room-temperature ionic liquid molecules dispersed in a polymer matrix

Cited by 4 publications

References 29 publications

Stark Spectroscopy of Rubrene. I. Electroabsorption Spectroscopy and Molecular Parameters

Stark Spectroscopy of Rubrene. I. Electroabsorption Spectroscopy and Molecular Parameters

Electroabsorption and Stark Fluorescence Spectroscopies of Thioflavin T

Charge-transfer state and state mixing in tetracyanoquinodimethane probed using electroabsorption spectroscopy

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