Photophysics of 4-dimethylamino 4′-cyanostilbene and model compounds: dual excited states revealed by sub-picosecond transient absorption and Kerr ellipsometry

Abraham, Emmanuel; Oberlé, J.; Jonusauskas, Gediminas; Lapouyade, R.; Rullière, C.

doi:10.1016/s0301-0104(96)00301-1

Cited by 81 publications

(76 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar two-step isomerization has also be reported in other styryl dyes such as LDS 750 17 and DCM, [39][40][41] as well as other push-pull molecule such as DCS. 42 Figure Figure 3. A schematic representation of the potential-energy curves for the relaxation of LDS 751 in the S1 state.…”

Section: Resultsmentioning

confidence: 99%

Determination of the Formation of Dark State via Depleted Spontaneous Emission in a Complex Solvated Molecule

et al. 2007

View full text Add to dashboard Cite

We present a general two-color two-pulse femtosecond pump-dump approach to study the specific population transfer along the reaction coordinate through the higher vibrational energy levels of excited states of a complex solvated molecule via the depleted spontaneous emission. The time-dependent fluorescence depletion provides the correlated dynamical information between the monitored fluorescence state and the SEP "dumped" dark states, and therefore allow us to obtain the dynamics of the formation of the dark states corresponding to the ultrafast photoisomerization processes. The excited-state dynamics of LDS 751 have been investigated as a function of solvent viscosity and solvent polarity, where a cooperative two-step isomerization process is clearly identified within LDS 751 upon excitation.

show abstract

Section: Resultsmentioning

confidence: 99%

Determination of the Formation of Dark State via Depleted Spontaneous Emission in a Complex Solvated Molecule

et al. 2007

View full text Add to dashboard Cite

show abstract

“…The cis±trans photoisomerization, which is followed by nonradiative relaxation into S 0 at the twisted conformation, is a competitive route against the formation reaction of the second species in the experimental ®ndings 1. The isomerization route from trans-DCS to twisted DCS in S 1 has only a small energy barrier in the gas phase [13], while it is practically hindered in polar solvents [9,11,15,16,18].…”

Section: Introductionmentioning

confidence: 99%

Ab initio configuration interaction study on electronically excited 4-dimethylamino-4′-cyanostilbene

Amatatsu

2000

Theoretical Chemistry Accounts: Theory, Computation, and Modeli

View full text Add to dashboard Cite

Ab initio con®guration interaction calculations have been performed to examine the electronic structures of both trans-4-dimethylamino-4¢-cyanostilbene (DCS) and four types of perpendicularly twisted DCSs, trans-DCS is predominantly excited into the S 1 state out of low-lying excited states. The S 1 state is an intramolecular charge-transfer (ICT) state in which the dipole moment is about twice as large as that in S 0 . The excited DCS at the 4-dimethylanilino twisted conformation, which becomes S 1 in polar solvents, has a very much larger dipole moment than that in S 1 to trans-DCS. This means that the geometrical structure of the twisted ICT (TICT) is the 4-dimethylanilino twisted form, not the dimethylamino twisted one which is well know from the TICT structure of 4-dimethylaminobenzonitrile.

show abstract

“…3, typical of states with large CT character [18,19], could imply that stabilization of the state reached by absorption in polar solvents leads to a structure of large ICT character or a new state of different conformation is produced having the NO 2 -or NO 2 -phenyl-group twisted by 90°( ''twisted intramolecular charge transfer", TICT process) [18,20,21]. At this stage of the work we have no clear evidence for the formation of this new state.…”

Section: Solvent Effectsmentioning

confidence: 84%

Molecular quantum mechanics

1998

Choice Reviews Online

View full text Add to dashboard Cite

a b s t r a c tConformations, spectra and photophysics of a series of new organic fluorophores, 2,3-distyrylbenzofuran derivatives, have been studied by a combined theoretical and experimental approach. Ground electronic state geometries have been investigated by Hartree-Fock ab initio methods and Density Functional Theory. Electronic spectra have been calculated with the CS INDO S-CI and SDT-CI procedures. Spectral and photophysical behaviour has been investigated by stationary and time-resolved techniques. Solvatochromism of these compounds has been analyzed. The UV-vis absorption spectra of the substituted compounds are very similar, showing a red shift in the series H < Cl < OCH 3 < NH 2 < NO 2 . The CS INDO CI analysis of the electronic spectra of all rotamers shows coherence with the prevalent presence of one non-planar conformer. These compounds are very stable and show an intense and structured fluorescence indicating that the emitting state is the same as that reached by absorption, i.e. the jp H p Ã L i singlet state. The nitro-derivative behaviour is exceptional if compared to the other compounds since it displays a strong fluorosolvatochromism, due to an intramolecular charge transfer state.

show abstract

Photophysics of 4-dimethylamino 4′-cyanostilbene and model compounds: dual excited states revealed by sub-picosecond transient absorption and Kerr ellipsometry

Cited by 81 publications

References 32 publications

Determination of the Formation of Dark State via Depleted Spontaneous Emission in a Complex Solvated Molecule

Determination of the Formation of Dark State via Depleted Spontaneous Emission in a Complex Solvated Molecule

Ab initio configuration interaction study on electronically excited 4-dimethylamino-4′-cyanostilbene

Molecular quantum mechanics

Contact Info

Product

Resources

About