Haftung

Lippert, Hans-Dieter; Kern, Bernd-Rüdiger

doi:10.1007/978-3-642-97302-4_42

Cited by 41 publications

(46 citation statements)

References 2 publications

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“…We followed the effect of the solvent polarity on the Stokes shift only in the case of compound 1. Increasing the solvent polarity (cyclohexane, dioxane, dicloroethane, ethanol, acetonitrile) leads to only a small enlargement in the Stokes shift; for cyclohexane -acetonitrile the difference is about 1000 cm -1 , and according to the Lippert's model [16] this corresponds to an increasing of the dipole moment in the fluorescence exited state of about 2D; this value is in the same order as the data for other 3-substituted coumarins [11].…”

mentioning

confidence: 76%

Luminescence Properties of Some Coumarins with 3:4-Fused Ring System

Nikolov

Petkova

Markov

2000

Zeitschrift Für Naturforschung A

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The photophysical characteristics of a group of coumarins with a 3:4-fused ring system (2-substituted-4,5-dioxo-l,2-dihydro-4H, 5H-pyrano-[3:4-c] [l]-benzopyrans) in solutions at room temperature, in frozen ethanol matrix at 77 K, in solid phase and in PVC films are reported. The low fluorescence quantum yield of the compounds investigated in solution is explained as a result of internal conversion from the fluorescent S 2 (TCJt*) state to the lower lying S^nJi*) state. The phosphorescence with a life time in the order of seconds is connected with intersystem crossing S[ (n;i*) -T^JtJt*). The absorption Franck Condon transitions in solid phase and in PVC matrix are only weekly batochromically shifted according to solution.

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mentioning

confidence: 76%

Luminescence Properties of Some Coumarins with 3:4-Fused Ring System

Nikolov

Petkova

Markov

2000

Zeitschrift Für Naturforschung A

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“…To find out more about the influence of protons on the fluorescence of 8,1 ANS we were interested in comparing the E T (30) dependence with the influence of some other polarity parameters, e.g. the orientation polarizability A/ [15], The results reveal that for a complete description of the phenomena the specific properties of the 1,4 dioxane/water mixtures have to be taken into account. The fluorescence intensities were related to those of a sample dissolved in pure 1,4-dioxane which was set equal to 1000.…”

Section: 1" a Nsmentioning

confidence: 99%

Solvatochromic Fluorescence of 8-(Phenylamino)-1-naphthalene-ammoniumsulfonate (8,1 ANS) in 1,4-Dioxane/Water Mixtures, revisited

Hüttenhain

Balzer

1993

Zeitschrift Für Naturforschung A

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The correlation of the solvatochromic fluorescence properties of 8-(phenylamino)-l-naphthaleneammoniumsulfonate (8,1 ANS) in 1,4-dioxane/water mixtures with £ r (30) and Af values of the respective solvents shows that besides the polarity the nature of the solvent mixture determines the fluorescence intensity / and the Stokes shift Av. Different amounts of hydrogen-bonding are suggested to be responsible for the different slopes of the correlation line plots.

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“…7 below). The absolute valines of the stimulated emission cross-section spectra were wrong, if the fluorescence quantum distributions would originate from a modified chromophoric system in the excited state like a twisted internal charge transfer (TICT) state (donor and acceptor group planar in the ground stale and perpendicular in excited state) [33][34][35][36][37][38][39][40].…”

Section: Fluorescence Studiesmentioning

confidence: 99%

“…Similar formulae are given in refs. [28,33,34,52,65,66]. The spectral absorption-emission difference depends strongly on the dye cavity radius a.…”

Section: / Determination Offi E -N G By Fluorescence Stokes Shift Anmentioning

confidence: 99%