Energy transfer between triplet states of organic molecules in a vapour phase

Zalesskaya, G. A.; Pavlova, V. T.; Sambor, E. G.; Bely, N. N.

doi:10.1016/s0009-2614(03)00609-2

Cited by 6 publications

(3 citation statements)

References 22 publications

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“… a Triplet energy values for model compound are taken from the literature. − . b Absorption spectra were measured in air-equilibrated solutions at 1 × 10 –4 M in 50% aqueous acetonitrile. c Emission spectra were recorded in air-equilibrated solutions at 1 × 10 –5 M in 50% aqueous acetonitrile. d PL quantum yields (Φ PL ) were determined using [Ru(bpy) 3 ] 2+ as a standard (Φ = 0.028, λ exc = 450 nm) in aerated CH 3 CN-water solution. e The triplet energy of 1 ON and 2 ON were estimated from the onset of their emission spectra. f Ref . g Ref . h Ref . i Ref . Abbreviations: 9-PA, 9-phenylanthracene; T 1 , triplet energy; sh, shoulder; b, broad; ND, not determined. …”

Section: Resultsmentioning

confidence: 99%

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ON-OFF Luminescence Signaling of Hybrid Organic–Inorganic Switches

Natarajan

Schmittel

2013

Inorg. Chem.

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The dyads 1OFF and 2OFF were prepared by combining the inorganic luminophores [Ru(phen)2(2-[imidazol-2-yl]pyridine)](2+) and [Re(CO)3Cl(2-[imidazol-2-yl]pyridine)] with 2-(anthracen-9-yl)-4-methylphenol as a second photoactive moiety. In both cases, the inorganic unit operates as the emitter, whereas the organic part acts as a controller. Emission of the inorganic luminophore can be reversibly switched ON and OFF by adjusting the energetic level of the (3)π-π* state of the appended anthracene unit through either dearomatization using a photohydration or aromatization applying a thermal dehydration. Emission of both switches is reversibly recorded and erased multiple times without significant degradation.

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Section: Resultsmentioning

confidence: 99%

“… i Ref . Abbreviations: 9-PA, 9-phenylanthracene; T 1 , triplet energy; sh, shoulder; b, broad; ND, not determined. …”

Section: Resultsmentioning

confidence: 99%

ON-OFF Luminescence Signaling of Hybrid Organic–Inorganic Switches

Natarajan

Schmittel

2013

Inorg. Chem.

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“…Quenching of PAH triplet states by SG in the gas phase was possible due to several intermolecular processes [14] such as transfer of triplet energy and electron and proton transfer. Rate constants for quenching of triplet states by oxygen k T O 2 that were obtained for the PAH vapors did not obey the energy gap law and, therefore, were incompatible with the assumption of quenching of PAH triplet states through triplet energy transfer.…”

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confidence: 99%

Gas-phase photoreactions of anthracene, 2-aminoanthracene, and pyrene with oxygen and water vapors

2009

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Excited singlet (S 1 ) and triplet (T 1 ) state quenching by O 2 and by (O 2 + H 2 O) gas-vapor mixtures was studied in the gas phase for polycyclic aromatic hydrocarbons (PAHs, anthracene, pyrene). Addition of water vapor is shown not to influence quenching of both fluorescence and delayed fluorescence of PAHs by oxygen. The role of complexes stabilized by charge transfer and hydrogen bonds in quenching the excited states of PAHs by atmospheric gases was analyzed.Keywords: polycyclic aromatic hydrocarbons, oxygen, water vapor, quenching of triplet and singlet states.Introduction. Polycyclic aromatic hydrocarbons (PAHs) are released into the atmosphere from industrial sites and play an important role in atmospheric photochemistry [1,2]. PAHs undergo natural oxidation by reacting with atmospheric oxygen, which renders a part of the oxidized PAHs harmless and removes them from the atmospheric processes. The presence in the atmosphere of gases other than oxygen (ammonia, CO 2 , NO x , etc.) introduces additional features to the reaction of PAHs with oxygen. Some of the most important gas-phase reactions are photochemical reactions of PAHs with products from the reaction of atmospheric water with oxygen.Herein we study quenching in the gas phase of singlet S 1 -and triplet T 1 -states of anthracene, 2-aminoanthracene (2-AA), and pyrene with oxygen and its mixtures (O 2 + H 2 O). Decay rates, fluorescence intensities, and delayed fluorescence (DF) as functions of spectator gas pressure P SG are used to estimate quenching rate constants of singlet k q S and triplet states k q T of PAHs by atmospheric gases, the fraction of quenched singlet q S and triplet states q T ,

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Intermolecular Processes in Excited Electronic States in the Gas Phase (Review)

Zalesskaya

Sambor

2005

J Appl Spectrosc

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A brief review of works on the temperature dependences of the rate constants k q of the intermolecular processes proceeding in the excited electronic states in the gas phase is given. The dependences k q (T) for such biomolecular processes as intermolecular vibrational energy transfer in the triplet state vibrational quasi-continuum, triplet-triplet electron excitation energy transfer, and intermolecular photoinduced electron transfer have been compared. The experimental data have shown that in the gas phase for all analyzed intermolecular processes both an increase and a decrease in k q with increasing temperature (T) is observed, which is not associated with the specific intermolecular interactions leading to the formation of long-lived components. The change in the type of temperature dependence is due to the change in the mechanisms of the radiationless transitions with increasing density of vibrational levels in the final electronic state. The applicability of the known models based on the theory of radiationless transitions for predicting the temperature dependences k q (T) is discussed.Keywords: temperature dependence of the rate constants of intermolecular processes, intermolecular vibrational energy transfer, triplet-triplet energy transfer, photoinduced intermolecular electron transfer.Introduction. Biomolecular processes play an important part in gaseous media such as the atmosphere, gaseous mixtures resulting from combustion and explosions, working mixtures of gas lasers, gaseous mixtures of isotopes, etc. In real molecular mixtures, the yield of photochemical reactions depends on the efficiency of the electron and vibrational energy exchange and transfer. The temperature dependences of the probability of collisional processes are of fundamental interest both for studying the nature of intermolecular interactions deactivating excited molecules and testing theoretical models. The practical interest in such studies is primarily due to the necessity of estimating the yield of gas-phase reactions in a wide range of temperatures.In analyzing the intermolecular processes in the excited electronic states, it is usually assumed that their rates increase with increasing temperature. Negative temperature dependences are considered as a result of specific intermolecular interactions leading to the formation of stable complexes of various nature. The most detailed theoretical studies of the temperature dependence of the energy transfer probability have been made for the intermolecular vibrational relaxation of small molecules in the system of discrete vibrational levels [1]. It has been shown that for this intermolecular process both positive and negative temperature dependences of the rate constants and the energy transfer efficiencies are possible. For the triplet-triplet (T-T) electron excitation energy transfer and the intermolecular photoinduced electron transfer (PET), the possibilities of modeling the temperature changes in the process probability were discussed only for some special cases in [2] and [3, 4...

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Energy transfer between triplet states of organic molecules in a vapour phase

Cited by 6 publications

References 22 publications

ON-OFF Luminescence Signaling of Hybrid Organic–Inorganic Switches

ON-OFF Luminescence Signaling of Hybrid Organic–Inorganic Switches

Gas-phase photoreactions of anthracene, 2-aminoanthracene, and pyrene with oxygen and water vapors

Intermolecular Processes in Excited Electronic States in the Gas Phase (Review)

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