Optical line shapes for polymethine dyes and their aggregates: Novel theory of quantum transitions and its correlation with experiment

Егоров, Владимир В.

doi:10.1016/j.jlumin.2010.09.001

Cited by 14 publications

(22 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A molecule, being a quantum system in the ground and excited states, during a quantum transition thus becomes a classical system, which, as is well known, has a continuous energy spectrum [7]. This physical picture of molecular quantum transitions based on the concept of dozy chaos is confirmed by the successful qualitative and quantitative theoretical explanations of a large number of experimental data on the shape of the optical bands in polymethine dyes and their aggregates [3–7,12–17] and also many other experimental data related to elementary electron-charge transfers [6,18–22], which is the simplest case of molecular quantum transitions [6,15,16]. …”

Section: Dozy-chaos Optical Band Shapes In Monomers Of Polymethine Dyesmentioning

confidence: 87%

“…The value of γ can be interpreted as the width of the vibronic energy levels arising in the transient state, but a detailed and successful comparison of the theory with experiment [3–7,12–14,16,17] shows that the value of γ significantly exceeds the energy gap between vibrational levels. Therefore, the idea of γ as the width of vibronic energy levels in the transient state is very rough.…”

Section: Dozy-chaos Optical Band Shapes In Monomers Of Polymethine Dyesmentioning

confidence: 99%

See 1 more Smart Citation

Nature of the optical band shapes in polymethine dyes and H-aggregates: dozy chaos and excitons. Comparison with dimers, H*- and J-aggregates

Егоров¹

2017

R. Soc. open sci.

Self Cite

View full text Add to dashboard Cite

Results on the theoretical explanation of the shape of optical bands in polymethine dyes, their dimers and aggregates are summarized. The theoretical dependence of the shape of optical bands for the dye monomers in the vinylogous series in line with a change in the solvent polarity is considered. A simple physical (analytical) model of the shape of optical absorption bands in H-aggregates of polymethine dyes is developed based on taking the dozy-chaos dynamics of the transient state and the Frenkel exciton effect in the theory of molecular quantum transitions into account. As an example, the details of the experimental shape of one of the known H-bands are well reproduced by this analytical model under the assumption that the main optical chromophore of H-aggregates is a tetramer resulting from the two most probable processes of inelastic binary collisions in sequence: first, monomers between themselves, and then, between the resulting dimers. The obtained results indicate that in contrast with the compact structure of J-aggregates (brickwork structure), the structure of H-aggregates is not the compact pack-of-cards structure, as stated in the literature, but a loose alternate structure. Based on this theoretical model, a simple general (analytical) method for treating the more complex shapes of optical bands in polymethine dyes in comparison with the H-band under consideration is proposed. This method mirrors the physical process of molecular aggregates forming in liquid solutions: aggregates are generated in the most probable processes of inelastic multiple binary collisions between polymethine species generally differing in complexity. The results obtained are given against a background of the theoretical results on the shape of optical bands in polymethine dyes and their aggregates (dimers, H*- and J-aggregates) previously obtained by V.V.E.

show abstract

Section: Dozy-chaos Optical Band Shapes In Monomers Of Polymethine Dyesmentioning

confidence: 87%

Section: Dozy-chaos Optical Band Shapes In Monomers Of Polymethine Dyesmentioning

confidence: 99%

Nature of the optical band shapes in polymethine dyes and H-aggregates: dozy chaos and excitons. Comparison with dimers, H*- and J-aggregates

Егоров¹

2017

R. Soc. open sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thus, a molecule, being a quantum system in the ground and excited states, for the time of a quantum transition becomes the classical one, which, as is well known, has a continuous energy spectrum. The above physical picture of molecular quantum transitions, based on the concept of dozy chaos, is confirmed by the successful qualitative and quantitative theoretical explanations for the large number of experimental data on the shape of the optical bands in polymethine dyes and their aggregates (Egorov, 2001(Egorov, , 2002(Egorov, , 2009(Egorov, , 2011(Egorov, , 2013a(Egorov, , b, c, 2014(Egorov, , 2017Petrenko and Stein, 2015), as well as for many other experimental data related to the elementary electron-charge transfers (see references in Egorov, 2013aEgorov, , 2014) -the simplest case of molecular quantum transitions (Egorov, 2013a, b, c).…”

mentioning

confidence: 73%

“…If we consider that our mind and the time that is allotted to us in order to achieve the above objective, are determined, ultimately, by dozy chaos itself, the natural question arises: "Can we, in principle, implement such an ambitious project on the forced improvement of the nature of human genome?" 5 (See Box…”

Section: Box 3 a Thought Experiments Illustrating Self-examination Ofmentioning

confidence: 99%

Dozy-chaos end of the human civilization

Егоров¹

2017

jusps-B

Self Cite

View full text Add to dashboard Cite

It is proposed to consider human beings and human community as very complex molecular physical systems in which dozy chaos plays a governing dynamic role. Dozy chaos is the cause of molecular quantum transitions and various chemical reactions, and as a result, the evolution of the entire molecular matter, up to the emergence of life, genome, and human being as such. It puts forward a concept of self-examination of dozy chaos, from which it is shown that mankind is likely doomed to failure in the short historical perspective as a result of the disastrous rise of egoistic inner contradictions, unless it learns to recode its genome from egoistic to altruistic by controlling dozy chaos on a global scale. It is argued that from the perspective of the survival of humanity in conditions of the existing egotistic human genotype, bipolar political arrangement of the world is preferable to both unipolar and multipolar arrangements of the world. It is shown that the gap between the high, and further growing rapidly, level of technological progress and an extremely low level of altruism of the human genotype, caused by our biological origin from the animal world, is the main and fatal source of our likely collective and common suicide in the near future.

show abstract

“…In recent years, polymethine dyes are widely used for biomedical imaging [3][4][5][6][7], such as the selective marking of different sub-cellular components [8][9][10][11][12], Förster resonance energy transfer microscopy [13][14][15] and fluorescence lifetime imaging [16,17]. Therefore, the excited state dynamics of dye compounds and the structure-function relationship remain the object of current scientific research [18][19][20]. Cyanine dyes have also attracted the interest of researchers due to their ability to form J-aggregates.…”

Section: Introductionmentioning

confidence: 99%

Dark states of symmetric polymethine dyes revealed by pump–dump–probe spectroscopy

Redeckas¹,

Voiciuk²,

Ishchenko³

et al. 2019

physics

View full text Add to dashboard Cite

We have applied three-pulse transient absorption spectroscopy to investigate the ultrafast photoisomerization dynamics in two symmetric polymethine dyes. Pump–deplete–probe experiments have revealed that the excited state manifold of these molecules contains two closely lying excited states in the dynamic equilibrium. One of these states is emissive, while the other is largely dark. It is the dark state that ultimately results in the photoisomer formation and is the main channel of excited state decay in these dyes. We have shown that excited state populations do flow between these two states and therefore it can be inferred that the photoisomerization pathway is not predetermined by ground state distortions of the molecular structure. The decision whether the molecule will isomerize or not seems to be taken in the excited state. Global analysis of three-pulse transient data allowed us to determine the spectra of the excited and ground intermediate states and build a comprehensive picture of photoinduced dynamics in symmetric polymethine dyes.

show abstract

Optical line shapes for polymethine dyes and their aggregates: Novel theory of quantum transitions and its correlation with experiment

Cited by 14 publications

References 22 publications

Nature of the optical band shapes in polymethine dyes and H-aggregates: dozy chaos and excitons. Comparison with dimers, H*- and J-aggregates

Nature of the optical band shapes in polymethine dyes and H-aggregates: dozy chaos and excitons. Comparison with dimers, H*- and J-aggregates

Dozy-chaos end of the human civilization

Dark states of symmetric polymethine dyes revealed by pump–dump–probe spectroscopy

Contact Info

Product

Resources

About