Visualizing overdamped wavepacket motion: Excited-state isomerization of pseudocyanine in viscous solvents

Dietzek, Benjamin; Tarnovsky, Alexander N.; Yartsev, Arkady

doi:10.1016/j.chemphys.2008.10.017

Cited by 23 publications

(20 citation statements)

References 67 publications

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“…The wavelengths of the dominant (a) bands from these emission spectra are listed in Table 1. Because of non-radiative relaxation, Dye I is nearly non-fluorescent in DMSO solution [18] and the other quinoline-terminated dyes (III and V) also have low quantum efficiencies [19,20] that made the collection of spectra impossible with the equipment available. Mid-infrared spectra of dyes I-VII were obtained at 4 cm À1 resolution from 7 mm diameter KBr …”

Section: Methodsmentioning

confidence: 99%

Relation of molecular structure to Franck–Condon bands in the visible-light absorption spectra of symmetric cationic cyanine dyes

Lin

Silzel

2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Section: Methodsmentioning

confidence: 99%

Relation of molecular structure to Franck–Condon bands in the visible-light absorption spectra of symmetric cationic cyanine dyes

Lin

Silzel

2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Recently, Dietzek et al have studied the excited state isomerization of pseudocyanine in viscous solvents. The photoinduced excited state processes in 1,1 0 -diethyl-2,2 0 -cyanine iodine are investigated using femtosecond time-resolved pump-probe spectroscopy and suggest a barrierless excited state isomerization in the short chain cyanine dye [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Steady-state fluorescence and photo-isomerization study of 1-methyl-4′-(p-N,N dimethyl-amino styryl) pyridinium iodide

Abdel-Halim

2011

Journal of Luminescence

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“…16 These dyes have been the subject of several spectroscopic investigations. 33,[35][36][37][38][39][40] In the cases of NK88 ͑Ref. 40͒ and 1122C, 35 evidence was cited for decay on different timescales, a fast timescale, ͑1-200 fs for 1122C, 35 and 1-2 ps for NK88͒, 40 and a slower one ͑ϳ4 ps for 1122C, and 9-11 ps for NK88͒.…”

Section: Introductionmentioning

confidence: 99%

Conical Intersections, charge localization, and photoisomerization pathway selection in a minimal model of a degenerate monomethine dye

Olsen

McKenzie

2009

The Journal of Chemical Physics

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We propose a minimal model Hamiltonian for the electronic structure of a monomethine dye, in order to describe the photoisomerization of such dyes. The model describes interactions between three diabatic electronic states, each of which can be associated with a valence bond structure. Monomethine dyes are characterized by a charge-transfer resonance; the indeterminacy of the single-double bonding structure dictated by the resonance is reflected in a duality of photoisomerization pathways corresponding to the different methine bonds. The possible multiplicity of decay channels complicates mechanistic models of the effect of the environment on fluorescent quantum yields, as well as coherent control strategies. We examine the extent and topology of intersection seams between the electronic states of the dye and how they relate to charge localization and selection between different decay pathways. We find that intersections between the S(1) and S(0) surfaces only occur for large twist angles. In contrast, S(2)/S(1) intersections can occur near the Franck-Condon region. When the molecule has left-right symmetry, all intersections are associated with con- or disrotations and never with single bond twists. For asymmetric molecules (i.e., where the bridge couples more strongly to one end) the S(2) and S(1) surfaces bias torsion about different bonds. Charge localization and torsion pathway biasing are correlated. We relate our observations with several recent experimental and theoretical results, which have been obtained for dyes with similar structure.

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Visualizing overdamped wavepacket motion: Excited-state isomerization of pseudocyanine in viscous solvents

Cited by 23 publications

References 67 publications

Relation of molecular structure to Franck–Condon bands in the visible-light absorption spectra of symmetric cationic cyanine dyes

Relation of molecular structure to Franck–Condon bands in the visible-light absorption spectra of symmetric cationic cyanine dyes

Steady-state fluorescence and photo-isomerization study of 1-methyl-4′-(p-N,N dimethyl-amino styryl) pyridinium iodide

Conical Intersections, charge localization, and photoisomerization pathway selection in a minimal model of a degenerate monomethine dye

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