Ultrafast quenching of the excited S2 state of benzopyranthione by acetonitrile

Burdziński, Gotard; Maciejewski, Andrzej; Buntinx, G.; Poizat, O.; Lefumeux, Christophe

doi:10.1016/j.cplett.2003.12.029

Cited by 25 publications

(28 citation statements)

References 19 publications

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“…The absorption and emission, as well as the photophysical and photochemical properties of BPT, have been carefully studied experimentally in perfluorohydrocarbons (extremely weakly-interacting and chemically-inert solvents), hydrocarbons, acetonitrile, and methanol in the S 1 (n,p*), S 2 (p,p*), and T 1 (n,p*) states. [15][16][17][18][25][26][27][28] Results of the theoretical calculations on the equilibrium structure, electron density distribution, dipole moment, UV-VIS and IR absorption spectra of BPT in the singlet states S 0 , S 1 (n,p*), and S 2 (p,p*) and in the lowest triplet state T 1 for the BPT molecule and its complexes with methanol have been reported by Zhao and Han. 2 Similar calculations were performed for the isomeric molecule of thiocoumarin (TC) in methanol.…”

Section: Introductionmentioning

confidence: 83%

Hydrogen bond effects in the ground and excited singlet states of 4H-1-benzopyrane-4-thione in water—theory and experiment

Krystkowiak

Koput

Maciejewski

2012

Phys. Chem. Chem. Phys.

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The hydrogen bond energies for 4H-1-benzopyrane-4-thione (BPT) in its ground and two lowest excited singlet electronic states have been determined using ab initio methods. It was shown that the BPT molecule can form, as an acceptor, four relatively strong hydrogen bonds with water molecules, leading to a stable complex in the ground electronic state S(0). The hydrogen bonds involving the sulfur atom from the thiocarbonyl group were found to be stronger than those involving the oxygen atom from the benzopyran moiety. The former hydrogen bonds were predicted to become significantly weaker upon excitation to the S(1) state and, in contrast, stronger upon excitation to the S(2) state. Calculated changes in the hydrogen bond energy due to the S(0)→ S(1) and S(0)→ S(2) excitation are in very good agreement with the experimental values obtained from the absorption solvatochromic study, according to a procedure proposed by us in [E. Krystkowiak, et al., J. Photochem. Photobiol. A: Chem., 2006, 184, 250]. The maxima of absorption spectra of the BPT-water hydrogen-bonded complex, calculated taking into consideration nonspecific solute-solvent interactions, are also in good agreement with the experimental results.

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Section: Introductionmentioning

confidence: 83%

Hydrogen bond effects in the ground and excited singlet states of 4H-1-benzopyrane-4-thione in water—theory and experiment

Krystkowiak

Koput

Maciejewski

2012

Phys. Chem. Chem. Phys.

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“…21 The excitation wavelength was 532 nm and energy densities of laser pulses from 12 to 300 mJ cm À2 were used. 21 The excitation wavelength was 532 nm and energy densities of laser pulses from 12 to 300 mJ cm À2 were used.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of local Stark effect observed for a complete D149 dye-sensitized solar cell

Burdziński

Karolczak

Ziółek

2013

Phys. Chem. Chem. Phys.

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A complete, functioning dye-sensitized solar cell made of popular indoline D149 sensitizer is studied by means of transient absorption in visible light in the time scale of nanoseconds to seconds. Photocurrent and photovoltage decays are also measured under the same experimental conditions. A local electric field causing a Stark shift of the D149 absorption band is found to strongly influence the transient spectra and kinetics. The presence of electrons in titania has a major contribution to the Stark shift and the effect disappears over many time scales with an average rate of 5 × 10(3) s(-1). This is much slower than the decay of the oxidized dye (2 × 10(6) s(-1)) but, on the other hand, significantly faster than the decay of electrons in titania nanoparticles (3 × 10(2) s(-1) at standard AM1.5 irradiation and open circuit conditions). Possible explanations of this phenomenon are discussed. Electron recombination from the titania conduction band to the oxidized dyes proceeds at an average rate of 2-16 × 10(4) s(-1), depending on the excitation energy density, and does not influence the efficiency of dye regeneration.

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“…Triplet-sensitized experiments were performed with a nanosecond transient absorption spectrometer described previously [23]. Pump pulses (355 nm) with energies of about 1 mJ in the sample, 8 ns (FWHM), were generated at a repetition rate of 0.5 Hz by a Q-switched Nd:YAG laser (Continuum Surelite II).…”

Section: Methodsmentioning

confidence: 99%

Time-resolved studies on the photoisomerization of a phenylene–silylene–vinylene type compound in its first singlet excited state

Burdziński

Bayda

Hug

et al. 2011

Journal of Luminescence

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Ultrafast quenching of the excited S2 state of benzopyranthione by acetonitrile

Cited by 25 publications

References 19 publications

Hydrogen bond effects in the ground and excited singlet states of 4H-1-benzopyrane-4-thione in water—theory and experiment

Hydrogen bond effects in the ground and excited singlet states of 4H-1-benzopyrane-4-thione in water—theory and experiment

Dynamics of local Stark effect observed for a complete D149 dye-sensitized solar cell

Time-resolved studies on the photoisomerization of a phenylene–silylene–vinylene type compound in its first singlet excited state

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