Anisotrophy of rotational diffusion of excited molecules in solution

Labhart, Heinrich; Pantke, E.R.

doi:10.1016/0009-2614(73)89006-2

Cited by 20 publications

(4 citation statements)

References 13 publications

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“…The rotational diffusion parameters for perylene and 9,10-dimethylanthracene in ethanol obtained by Labhart and Pantke are 9.0 X 105 and 18 X 105 P s"1 K"1, respectively. 23 Although the indole and naphthalene de-rivatives that have been studied in the present paper are smaller in molecular size than perylene and 9,10-dimethylanthracene, they have smaller d values compared with those of perylene and 9,10-dimethylanthracence. This suggests that propylene glycol molecules solvate to these solute molecules and then the solvated spheres rotate as a whole.…”

Section: Discussionmentioning

confidence: 60%

The fluorescent level inversion of dual fluorescences and the motional relaxation of excited state molecules in solutions

Suzuki¹,

Fujii²,

Imai³

et al. 1977

J. Phys. Chem.

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The temperature dependence of the fluorescence of 1-naphthol, indole, 1-naphthonitrile, and 1-naphthylamine in propylene glycol over the temperature range 320-170 K and of 1-naphthol and indole in glycerin over the temperature range 350-200 K has been studied. These compounds all emit a broad structureless fluorescence spectrum at room temperature. Lowering the temperature blue shifts the fluorescence and structures it except for 1-naphthylamine. These observed spectral changes have been interpreted using fluorescence polarization spectra as being due to the fluorescent level inversion of dual fluorescences. From the temperature dependence of the degree of polarization, the motional relaxation of excited state molecules in solutions has been estimated.It is concluded that fluorescent level inversion may occur at temperature ranges where the solute molecules cannot translate or rotate to any appreciable extent in solution.

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Section: Discussionmentioning

confidence: 60%

The fluorescent level inversion of dual fluorescences and the motional relaxation of excited state molecules in solutions

Suzuki¹,

Fujii²,

Imai³

et al. 1977

J. Phys. Chem.

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“…A variety of spectroscopic methods have been utilized to probe solution-phase systems, including vibrational relaxation, − fluorescence lifetime, and molecular reorientation measurements. ,− In this study, we have chosen to use time-resolved fluorescence lifetime and anisotropy measurements of 4-benzylamino-7-nitrobenzofurazan (BBD) because of the properties of this chromophore and the wide use of its structural derivatives in the study of micellar and lipid bilayer structures. − We study rotational diffusion due to the relatively high information content of the experimental data and the established theoretical framework that is available for interpretation of the data. − While the interpretation of fluorescence lifetime data is less straightforward and more system-dependent, for the chromophore that we use here, there is an established dependence of its fluorescence lifetime on the “polarity” of the local environment. − The chromophore that we have chosen for this work (BBD, Figure ) is a member of a family of chromophores with the 7-nitrobenz-2-oxa-1,3-diazol-4-yl (NBD) group. These chromophores are known to exhibit absorption and emission band positions that are sensitive to solvent polarity, causing them to be used widely as fluorescent probes in biological and model membrane systems. − Shorter fluorescence lifetimes are observed with more polar solvents, making these probes well-suited for studies of binary solvent systems.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of 4-Benzylamino-7-nitrobenzofurazan in the 1-Propanol/Water Binary Solvent System. Evidence for Composition-Dependent Solvent Organization

Stevenson

Blanchard

2006

J. Phys. Chem. A

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We report on the fluorescence lifetime and rotational diffusion dynamics of 4-benzylamino-7-nitrobenzofurazan (BBD) in a series of 1-propanol/water binary solvent systems. The fluorescence lifetime of BBD increases monotonically with increasing 1-propanol concentration. The rotational diffusion dynamics of BBD also vary with solution 1-propanol content, but this variation is not monotonic. Comparison of the BBD rotational diffusion time constant to solution viscosity and 1-propanol composition reveals the presence of a solution composition dependence of solvent-solute interactions, with a relative decrease in solvent-solute interaction strength for solvent system compositions where the 1-propanol/water azeotrope is known to exist. These data point collectively to the existence of microscopic heterogeneity in these binary solvent systems.

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“…Furthermore, perylene is photostable, has a monoexponential decay of its photophysics, and does not change conformation in a lipid bilayer upon electronic excitation. − Moreover, it has two almost orthogonal absorption dipole moments in the plane of the molecule, one in the UV and one in the blue . This property can be exploited in a quantitative characterization of both the orientation and the in-plane and out-of-plane rotations of the molecular plane in the bilayer. − In the second place, the two absorption moments can be exploited to obtain additional independent data for use in global target analysis.…”

Section: Introductionmentioning

confidence: 99%

“…5 This property can be exploited in a quantitative characterization of both the orientation and the in-plane and out-of-plane rotations of the molecular plane in the bilayer. [6][7][8][9][10][11][12][13] In the second place, the two absorption moments can be exploited to obtain additional independent data for use in global target analysis.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Properties of 2,5,8,11-Tetra-tert-butylperylene in Polymer Films

et al. 1997

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The spectroscopic properties of 2,5,8,11-tetra-tert-butylperylene in poly(vinyl alcohol) have been studied. To this end, the absorption and fluorescescence excitation and emission spectra have been measured. The shape of the spectra in poly(vinyl alcohol) is virtually identical with that in propanediol and lipid systems. The Förster radius calculated from the spectra was found to be 3.7 ± 0.3 nm. The natural fluorescence lifetime of 2,5,8,11-tetra-tert-butylperylene in poly(vinyl alcohol) was also calculated from the spectra and found to be 5.3 ± 0.2 ns. The fluorescence decay in poly(vinyl alcohol) exhibits monoexponential behavior with a lifetime of 4.5 ± 0.3 ns. It is shown that the fluorescence anisotropy of 2,5,8,11-tetra-tert-butylperylene in the polymer matrix does not decay, indicating that its motion is quenched on the time scale of the fluorescence decay. The initial value of the fluorescence anisotropy, r(0), for excitation at 260 nm and emission at 455 nm is −0.16 ± 0.02 while for excitation at 440 nm and emission at 455 nm it is 0.35 ± 0.02. The fluorescence transition dipole moments relative to the long molecular axis in the plane of the molecule were determined from angle-resolved fluorescence depolarization measurements. This yields an emission dipole moment at 459 nm of 5 ± 5°, an excitation dipole moment at 416 nm of −10 ± 5°, and an excitation dipole moment at 256 nm of 80 ± 5°.

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Anisotrophy of rotational diffusion of excited molecules in solution

Cited by 20 publications

References 13 publications

The fluorescent level inversion of dual fluorescences and the motional relaxation of excited state molecules in solutions

The fluorescent level inversion of dual fluorescences and the motional relaxation of excited state molecules in solutions

Dynamics of 4-Benzylamino-7-nitrobenzofurazan in the 1-Propanol/Water Binary Solvent System. Evidence for Composition-Dependent Solvent Organization

Spectroscopic Properties of 2,5,8,11-Tetra-tert-butylperylene in Polymer Films

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