Thermally activated delayed S1 fluorescence of aromatic thiones

Maciejewski, Andrzej; Szymański, M.; Steer, Ronald P.

doi:10.1021/j100281a051

Cited by 86 publications

(69 citation statements)

References 4 publications

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“…Even the typically spectral properties of thiones in the two groups of solvents look alike. The energies of excited states, positions of the maxima in absorption and emission bands, shapes of the spectral bands, Stokes shifts as well as the intensities of the absorption bands expressed by a molar extinction coefficient value are similar [4,5,7,10,29]. This similarity is also evident from Fig.…”

Section: Resultssupporting

confidence: 62%

“…As solvents we used: perfluoro1,3-dimethylcyclohexane, PFDMCH, 3-methylpentane, 3MΡ, and benzene, C6H6. As we have shown many times [2][3][4][5][6][7][8][9][10]29], only the use of perfluoroalkanes as solvents ensures the possibility of investigating intramolecular properties of thiones in the S2-and Τ1-states. The use of 3MΡ, a typical aliphatic hydrocarbone, ensures that the interactions with thioketones in the S2 and T1 -state are limited to the reaction of hydrogen abstraction only [5, 7-10, 15, 16] as the universal (physical) interactions are in it negligibly weak [5, 8-10, 29, 30].…”

Section: Resultsmentioning

confidence: 99%

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Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S₂- and T₁-States

et al. 1996

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Spectral and photophysical properties of a few aromatic thioketones in their S2-and T1-state, in particular those determined by their interactions with solvents, are discussed. The reasons for a drastically different behaviour of thioketones in interactions with benzene as well as saturated hydrocarbons and perfluoroalkanes are analysed in more detaił. Results of the time-resolved transient absorption measurements in the pico-and nanosecond time scale are given. An analysis of these results proves that a product of the decay of the S2-state of xanthione in benzene is a new transient (τile > 60 ps) individuum which, regarding the system properties and the conditions of the experiment, has been identified as an exciplex in S 2 -state formed as a result of an efficient interaction with benzene molecule. Also in xanthione/alkane systems the involvement of a transient individuum was proved. Most probably, this individuum was a thioketyl radical which could be formed by hydrogen abstraction from a hydrocarbon molecule by xanthione in the S2 -state. Such individua act as intermediates in passing excitation to the triplet states of thioketones and are effective channels of the S2-state decay. The changes observed in the transient absorption spectra of xanthione in C 6 Η6 in the time range of 10 -7 -10 -6 s can be attributed to the formation of an excimer in the T1-state as a result of the T1-state selfquenching.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S₂- and T₁-States

et al. 1996

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“…The experimental and fitted values of I DF /I PF as a function of temperature are presented in Figure 3, with the fitting being made to Equation (10) and also Equation (11), Equation (12), and Equation (13).…”

Section: Resultsmentioning

confidence: 99%

“…TADF is significant only if the S 1 -T 1 energy gap (DE ST ) is small and if the lifetime of T 1 is long enough. Despite being known for a long time, TADF continues to be a rare and usually weak phenomenon; there have been just a few observations in xanthene dyes, [10] aromatic ketones, [11,12] thiones, [13] and aromatic hydrocarbons. [14][15][16] Probably for this reason TADF has not been used before for temperature measurement, with one single, but interesting exception.…”

Section: Introductionmentioning

confidence: 99%

An Optical Thermometer Based on the Delayed Fluorescence of C₇₀

Baleizão¹,

Nagl

Borisov

et al. 2007

Chemistry A European J

108

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“…TDF is significant only when the energy difference between S 1 and T 1 ( E ST ) is small and when the lifetime of T 1 is long enough. In spite of being known for a long time, TDF continues to be a rare and usually weak phenomenon, with few observations in some dyes [7], aromatic ketones [8,9], thiones [10], and aromatic hydrocarbons [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Molecular Thermometer Based on the Delayed Fluorescence of C70 Dispersed in a Polystyrene Film

Baleizão

Berberan‐Santos

2006

J Fluoresc

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A new optical molecular thermometer, based on the thermally activated delayed fluorescence of C 70 dispersed in a polystyrene film, was developed. In the presence of oxygen, the fluorescence intensity of the C 70 film is essentially temperature independent in a wide range. In the absence of oxygen, however, the fluorescence intensity markedly increases with temperature. At room temperature (25 • C), and after degassing the sample, the fluorescence intensity of C 70 increases 22 times, while at 100 • C the fluorescence intensity is increased by 70 times. With our system, the very weak fluorescence of C 70 ( F ∼ = 5 × 10 −4 , in toluene) can be increased up to 91 times (up to an estimated maximum value F = 0.046). The estimate value of the singlet-triplet gap (29 kJ mol −1 ) and the fluorescence lifetime (0.63 ns) of the C 70 in film are in agreement with the values reported in the literature for C 70 in solution. The values of the phosphorescence lifetime at room temperature (23 ms) and the quantum yield of triplet formation (0.989) were also determined. The system is completely reversible with respect to heating-cooling cycles.

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Thermally activated delayed S1 fluorescence of aromatic thiones

Cited by 86 publications

References 4 publications

Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S₂- and T₁-States

Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S₂- and T₁-States

An Optical Thermometer Based on the Delayed Fluorescence of C₇₀

A Molecular Thermometer Based on the Delayed Fluorescence of C70 Dispersed in a Polystyrene Film

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Thermally activated delayed S1 fluorescence of aromatic thiones

Cited by 86 publications

References 4 publications

Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S2- and T1-States

Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S2- and T1-States

An Optical Thermometer Based on the Delayed Fluorescence of C70

A Molecular Thermometer Based on the Delayed Fluorescence of C70 Dispersed in a Polystyrene Film

Contact Info

Product

Resources

About

Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S₂- and T₁-States

Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S₂- and T₁-States

An Optical Thermometer Based on the Delayed Fluorescence of C₇₀