Deactivation ofS 1 andT 1 states of porphyrins and chlorins upon their interaction with molecular oxygen in solutions

Zenkevich, É. I.; Sagun, E. I.; Knyukshto, V. N.; Шульга, А. М.; Миронов, А. Ф.; Efremova, Olga A.; Bonnett, Raymond; Kaddem, M.

doi:10.1007/bf02606894

Cited by 9 publications

(12 citation statements)

References 15 publications

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“…The fluorescence quantum yield for H 2 {SeN 2 }-PA(Bz t Bu) 3 Φ F = 0.14, while for H 2 PA(Bz t Bu) 4 Φ F = 0.77. [13] The quenching of the fluorescence might be due to the internal effect of the heavy atom of Se (see ref.…”

Section: K N Solovyov Et Almentioning

confidence: 96%

“…Considerable changes are also observed for H 2 {SeN 2 }PA(Bz t Bu) 3 in the region of the second electronic transition. As a result the Q 2 (0-0) band is broadened, its intensity is decreased, and the Q 2 -Q 1 gap is increased to ∆E Q 2 Q 1 = 1620 cm -1 from ∆E Q 2 Q 1 = 900 cm -1 for H 2 PA(Bz t Bu) 4 . These peculiarities of the Q 2 band are evidently connected with action of the vibronic analogue of the Fermi resonance (see ref.…”

Section: K N Solovyov Et Almentioning

confidence: 99%

“…[20] [c] Experimental shifts are calculated using the spectral data reported for H 2 PA [8] and H 2 Pc. [20] [d] Experimental shifts are calculated using the spectral data for tert-butyl substituted derivatives -Н 2 PA(Bz t Bu) 4 , [10] Н 2 {SN 2 }PA(Bz t Bu) 3 [3] and Н 2 {SeN 2 }PA(Bz t Bu) 3 (present work).…”

Section: Electronic Absorption Spectramentioning

confidence: 99%

“…The results of spectral luminescence study obtained for Н 2 {SN 2 }-PAPh 6 and Н 2 {SеN 2 }PAPh 6 are compared with the data on octaphenylporphyrazine (H 2 PAPh 8 ), and results for H 2 {SeN 2 }PA(Bz t Bu) 3 -with the data for the corresponding phthalocyanine, H 2 PA(Bz t Bu) 4 6 and Н 2 {SеN 2 }PAPh 6 was conducted as described earlier. [1] During chromatographic isolation of these compounds the symmetrical porphyrazine H 2 PAPh 8 was obtained as by-product.…”

Section: Introductionmentioning

confidence: 99%

“…for [M + ] -760.2) was demetallated in a CH 2 Cl 2 -CF 3 COOH mixture (1:1) overnight, and, after evaporation of solvents, the residue was chromatographed on alumina to give 9 mg of H 2 {SeN 2 }PA(Bz t Bu) 3 The spectral-luminescent characteristics were measured using the automated spectrometric apparatus, described in details elsewhere. [4] The fluorescence quantum yield (Φ F ) was measured relative to a solution of tetraphenylporphine in toluene for which Φ F = 0.09 (in the presence of air oxygen). [5] The absorption spectra were recorded on a Varian Cary-500 Scan spectrophotometer.…”

Section: Introductionmentioning

confidence: 99%

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Porphyrazines with Annulated Chalco¬gen-Containing Heterocycle: Study of Spectral-Luminescent Properties and Quantum-Chemical Calculations of the Excited Electronic States

Solovyov¹,

Stuzhin²,

Kuzmitsky³

et al. 2010

MHC

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Section: K N Solovyov Et Almentioning

confidence: 96%

Section: K N Solovyov Et Almentioning

confidence: 99%

Section: Electronic Absorption Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Porphyrazines with Annulated Chalco¬gen-Containing Heterocycle: Study of Spectral-Luminescent Properties and Quantum-Chemical Calculations of the Excited Electronic States

Solovyov¹,

Stuzhin²,

Kuzmitsky³

et al. 2010

MHC

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Electronic structure and fluorescence of the Mg(II) complex of 1,4-diazepinotribenzoporphyrazine

et al. 2009

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Spectral and luminescent properties of a new phthalocyanine analog, the magnesium complex of diphenyl substituted mono (1,4-diazepino)tribenzoporphyrazine, have been studied at 293 and 77 K. The results have been explained on the basis of quantum-chemical calculations for both this molecule and its simpler analogs with respect to 6H/1H-isomerism of the 1,4-diazepine ring. The small difference between the ground-state energies for the 6H and 1H isomers makes tautomerism between them possible. It is shown that the electronic transitions with intramolecular charge transfer from the diazepine fragment to the macrocycle have relatively low energy, especially for the 1H isomers. These states can be of considerable importance for photophysical and photochemical processes. A comparison of the theoretical and experimental electronic absorption spectra has confirmed that the diazepine ring in the substituted Mg-diazepinoporphyrazine is present in the 6H-form. It is established that substitution of one benzene ring by a diazepine fragment leads to quenching of fluorescence, decreasing its quantum yield to 27% (for Mg-phthalocyanine 76%).Introduction. The synthesis and investigation of phthalocyanine analogs, including those with rings other than benzene, are currently of great interest in the chemistry of porphyrins and phthalocyanines. Such compounds are expected to possess fundamentally different physicochemical properties and to be promising for creating new materials with given properties.Octaphenyl derivatives of porphyrazine (tetraazaporphine) with four annelated 7-membered diazepine rings, both the free bases and the metal complexes, have been synthesized and characterized [1,2]. We use for these the abbreviations MPADz 4 Ph 8 (M = 2H, Mg, Zn), where PA is porphyrazine; Dz, diazepine; and Ph, phenyl.

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Photoexcitation-Energy Deactivation in a Solution of 10-Phenyl-5,15-di-(4,6-Dichloropyrimidinyl)-Corrole at 77 K

et al. 2023

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Deactivation ofS 1 andT 1 states of porphyrins and chlorins upon their interaction with molecular oxygen in solutions

Cited by 9 publications

References 15 publications

Porphyrazines with Annulated Chalco¬gen-Containing Heterocycle: Study of Spectral-Luminescent Properties and Quantum-Chemical Calculations of the Excited Electronic States

Porphyrazines with Annulated Chalco¬gen-Containing Heterocycle: Study of Spectral-Luminescent Properties and Quantum-Chemical Calculations of the Excited Electronic States

Electronic structure and fluorescence of the Mg(II) complex of 1,4-diazepinotribenzoporphyrazine

Photoexcitation-Energy Deactivation in a Solution of 10-Phenyl-5,15-di-(4,6-Dichloropyrimidinyl)-Corrole at 77 K

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