Studies on Triplet Radiative Lifetimes, Phosphorescence, and Delayed Fluorescence Yields of Aromatic Hydrocarbons in Liquid Solutions

Langelaar, J.; Rettschnick, R.P.H.; Hoijtink, G. J.

doi:10.1063/1.1674576

Cited by 77 publications

(36 citation statements)

References 20 publications

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“…Thus for liquid solutions of naphthalene, phenanthrene, pyrene, and anthracene in ethanol at room temperature, the lifetimes of the triplet states measured in [8] from the delayed annihilation kinetics were several milliseconds.…”

mentioning

confidence: 98%

Nature of delayed luminescence of N-methylindole and indole in the gas phase

Borisevich¹,

Sukhodola²,

Tolstorozhev³

2007

J Appl Spectrosc

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We have studied the spectral characteristics and the kinetics of delayed (long-lived) luminescence of Nmethylindole and indole in the gas phase. For N-methylindole, we observed delayed annihilation fluorescence, spectrally matching fast fluorescence. There is no delayed annihilation fluorescence for indole, but we observed a delayed luminescence band with wavelength at the maximum 535 nm, which we interpreted as luminescence of free radicals formed as a result of dissociation of the N-H bond. We hypothesize that the excited states of the free radicals arise as a result of nonradiative energy transfer from indole in the triplet state to indole free radicals in the doublet state. The lifetimes of the triplet states of N-methylindole and indole in the gas phase at T = 373 K, obtained from analysis of the delayed luminescence kinetics, are 2.5 msec and 1.0 msec.Introduction. Indole molecules are the chromophores of biologically important tryptophan compounds, the phosphorescence of which carries information about slow processes occurring in proteins over time periods in the microsecond and millisecond range. Accordingly, it seems timely to measure the lifetimes of the triplet states of indole and its derivatives in different media and also in the gas phase, where the effect of the medium is eliminated.Initially the lifetimes (τ) of the triplet states of indole and its derivatives were measured in rigid media (frozen solutions and polymer films) and they were several seconds [1]. On going to media with low viscosity, the lifetime of the triplet states sharply decreased (by several orders of magnitude). In liquid solutions at room temperature, the lifetime of the triplet states of indoles was measured for the first time in 1975 [2]. A value of τ = 12 µsec was obtained by flash photolysis for an aqueous solution of indole. For other indole derivatives in aqueous solutions, the value of ( measured by the same method was several tens of microseconds [2][3][4]. In a later paper [5], a value of τ ≈ 40 µsec was measured from analysis of the fluorescence kinetics of indole and its derivatives in aqueous solution.

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mentioning

confidence: 98%

Nature of delayed luminescence of N-methylindole and indole in the gas phase

Borisevich¹,

Sukhodola²,

Tolstorozhev³

2007

J Appl Spectrosc

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“…The energy levels of these triplet RP states are above those of 3 *An and 3 *NI, so that spin-selective CR can occur from the triplet RPs to produce (DMJ-An-FN n -3 *NI) and (DMJ-An-PE n P-3 *NI) (E T = 2.03 eV), [15] as well as (DMJ-3 *An-FN n -NI) and (DMJ-3 *An-PE n P-NI), respectively (E T = 1.85 eV). [16] For spin-selective CR to 3 *NI and 3 *An, the broad absorption features at 480 nm and 430 nm [17] persist on the microsecond timescale and appear as plateaus in the kinetic traces (Figure 2, insets). The decay-associated spectra for the FN 2 and PE 2 P bridges indicate that CR to both 3 *An and 3 *NI is limited by the lifetimes of their RPs ( Figure S2 in the Supporting Information).…”

mentioning

confidence: 99%

Comparing Spin‐Selective Charge Transport through Donor–Bridge–Acceptor Molecules with Different Oligomeric Aromatic Bridges

Scott¹,

Ricks²,

Colvin³

et al. 2010

Angew Chem Int Ed

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Burning bridges: The exponential distance dependence (β value) of singlet and triplet charge recombination (CR) pathways is determined for three donor-bridge-acceptor (DBA) molecules. p-Phenylethynylene and fluorenone bridges have similar β values, which differ significantly from those of p-phenylene bridges, thus implying that β for both singlet and triplet CR is system-dependent, not bridge-specific.

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“…However, since both emission intensities are similar, a significant amount of interaction between the pyrene and the bipyridine or phenanthroline moieties of the complexes must occur. Reported quantum yields for pyrenes are usually near 1, and pyrene based emission intensity should therefore be significantly higher without interaction . This effect is also visible in the excitation spectra (Figure S3, Supporting Information), as the pyrene features are clearly discernible for all three complexes.…”

Section: Resultsmentioning

confidence: 82%

“…Reported quantum yields for pyrenes are usually near 1, and pyrene based emission intensity should therefore be significantly higher without interaction. [21] This effect is also visible in the excitation spectra ( Figure S3, Supporting Information), as the pyrene features are clearly discernible for all three complexes.…”

Section: Photophysical Propertiesmentioning

confidence: 67%

Minimizing Side Product Formation in Alkyne Functionalization of Ruthenium Complexes by Introduction of Protecting Groups

Wintergerst

Witas

Nauroozi

et al. 2020

Zeitschrift anorg allge chemie

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The synthesis of alkyne functionalized bipyridine ruthenium complexes are reported. The improved synthetic approach through application of stable protecting groups prevents formation of possible side products while facilitating purification. By applying copper‐catalysed azide‐alkyne cycloaddition reactions (CuAAC) pyrene units with flexible alkyl linkers are introduced at the periphery of the complex, opening up various applications including surface immobilization and DNA intercalation. All complexes are characterized structurally as well as photophysically, especially regarding the influence of the introduced alkyne and triazolyl substituents on their photophysical behavior.

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Studies on Triplet Radiative Lifetimes, Phosphorescence, and Delayed Fluorescence Yields of Aromatic Hydrocarbons in Liquid Solutions

Cited by 77 publications

References 20 publications

Nature of delayed luminescence of N-methylindole and indole in the gas phase

Nature of delayed luminescence of N-methylindole and indole in the gas phase

Comparing Spin‐Selective Charge Transport through Donor–Bridge–Acceptor Molecules with Different Oligomeric Aromatic Bridges

Minimizing Side Product Formation in Alkyne Functionalization of Ruthenium Complexes by Introduction of Protecting Groups

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