Untitled

Егоров, Владимир В.; Алфимов, М. В.

doi:10.1070/pu2007v050n10abeh006317

Cited by 53 publications

(157 citation statements)

References 9 publications

Supporting

Mentioning

154

Contrasting

Order By: Relevance

“…These exchange processes lead to chaotization of the motion of electrons and nuclei in the transient state. 4,5,13,14 As a result of emerging this transient chaos, a part of the vibrational motion of the nuclei is transformed into the translational motion of their equilibrium positions to new positions in space, and then the translational motion transforms back to the vibrational motion near these new positions to complete the molecular quantum transition. Because this chaos arises only in the transient state and is absent in the initial and final states of the system, it may be called dozy chaos.…”

Section: Dozy Chaos and Dozy-chaos-exciton Couplingmentioning

confidence: 99%

“…Because this chaos arises only in the transient state and is absent in the initial and final states of the system, it may be called dozy chaos. 4 It should be noted that until recently 4, 5, 9-14 the modern physics and chemistry have been lacking for the idea of dozy chaos.…”

Section: Dozy Chaos and Dozy-chaos-exciton Couplingmentioning

confidence: 99%

“…The latter explains the optical spectra of dye aggregates but does not explain the spectra of constituent monomers. 4,5 What is more, the conventional approach does not explain experimental data on the optical band shape for H * -aggregates. The purpose of this paper is to explain the nature of a narrow and blue-shifted optical absorption H * -band ( Fig.…”

mentioning

confidence: 99%

“…As is well known, exciton effects in the formation of a dimer optical band are rather important. 4,5 It will be explained below what are dozy chaos and dozy-chaos-exciton coupling.…”

mentioning

confidence: 99%

“…All the existing theoretical discussions of this problem were covered in our recent reviews. 4,5 There are two main and essentially distinct theoretical approaches to the problem: the author's one leaning upon the Green function method and so-called dozy chaos, 4 and the conventional concept based on the Born-Oppenheimer adiabatic approximation. 6 The former provides an explanation of optical spectra both for polymethine dye aggregates and for molecules composing them.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Nature of the narrow optical band in H*-aggregates: Dozy-chaos–exciton coupling

Егоров

2014

AIP Advances

Self Cite

View full text Add to dashboard Cite

Dozy chaos emerges as a combined effect of the collective chaotic motion of electrons and nuclei, and their chaotic electromagnetic interactions in the transient state of molecules experiencing quantum transitions. Following earlier discussions of the well-known Brönsted relations for proton-transfer reactions; the temperature-dependent electron transfer in Langmuir–Blodgett films; the shape of the optical bands of polymethine dye monomers, their dimers, and J-aggregates, this paper reports one more application of the dozy-chaos theory of molecular quantum transitions. The qualitative and quantitative explanations for shape of a narrow and blue-shifted optical absorption band in H*-aggregates is given on the basis of the dozy-chaos theory by taking into account the dozy-chaos–exciton coupling effect. It is emphasized that in the H*-aggregate chromophore (dimer of cyclic bis-thiacarbocyanines) there is a competition between two Frenkel exciton transitions through the chaotic reorganization motion of nuclear environment. As a result, the highly organized quantum transition to the upper exciton state becomes an exciton-induced source of dozy chaos for the low organized transition to the lower exciton state. This manifests itself in appearing the narrow peak and broad wing in the optical spectrum pattern of H*-aggregates. A similar enhancement in the H*-effect caused by the strengthening of the exciton coupling in H*-dimers, which could be achieved by synthesizing tertiary and quarternary thiacarbocyanine monomers, is predicted.

show abstract

Section: Dozy Chaos and Dozy-chaos-exciton Couplingmentioning

confidence: 99%

Section: Dozy Chaos and Dozy-chaos-exciton Couplingmentioning

confidence: 99%

mentioning

confidence: 99%

“…As is well known, exciton effects in the formation of a dimer optical band are rather important. 4,5 It will be explained below what are dozy chaos and dozy-chaos-exciton coupling.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Nature of the narrow optical band in H*-aggregates: Dozy-chaos–exciton coupling

Егоров

2014

AIP Advances

Self Cite

View full text Add to dashboard Cite

show abstract

J‐Aggregate: von ihrer zufälligen Entdeckung bis zum gezielten supramolekularen Aufbau funktioneller Farbstoffmaterialien

2011

View full text Add to dashboard Cite

J‐Aggregate sind von Interesse für organische Materialen, die mithilfe supramolekularer Ansätze konzipiert werden. Ihre Entdeckung in den 1930er Jahren war ein Meilenstein der Farbstoffchemie und ein Startpunkt für die supramolekulare Chemie. Die interessanten optischen Eigenschaften von J‐Aggregaten (besonders ihre sehr schmalen, im Vergleich zu denen des Monomers rotverschobenen Absorptionsbanden und ihre Fähigkeit zur Delokalisierung und zum Transport von Excitonen) sowie das daraus resultierende Anwendungspotenzial motivierten Wissenschaftler, sich mit J‐Aggregaten zu befassen, weshalb bereits zahlreiche Beiträge zu diesem Gebiet veröffentlicht wurden. Dieser Aufsatz gibt einen Überblick über nach supramolekularen Konstruktionsprinzipien hergestellte J‐Aggregate verschiedener Farbstoffklassen (darunter Cyanine, Porphyrine, Phthalocyanine und Perylenbisimide) und diskutiert ihre optischen und photophysikalischen Eigenschaften sowie ihre Anwendungsperspektiven. Damit sollte dieser Übersichtsartikel für die supramolekulare und Photochemie wie auch die Materialwissenschaften von Interesse sein.

show abstract

J‐Aggregates: From Serendipitous Discovery to Supramolecular Engineering of Functional Dye Materials

2011

View full text Add to dashboard Cite

J-aggregates are of significant interest for organic materials conceived by supramolecular approaches. Their discovery in the 1930s represents one of the most important milestones in dye chemistry as well as the germination of supramolecular chemistry. The intriguing optical properties of J-aggregates (in particular, very narrow red-shifted absorption bands with respect to those of the monomer and their ability to delocalize and migrate excitons) as well as their prospect for applications have motivated scientists to become involved in this field, and numerous contributions have been published. This Review provides an overview on the J-aggregates of a broad variety of dyes (including cyanines, porphyrins, phthalocyanines, and perylene bisimides) created by using supramolecular construction principles, and discusses their optical and photophysical properties as well as their potential applications. Thus, this Review is intended to be of interest to the supramolecular, photochemistry, and materials science communities.

show abstract

Untitled

Cited by 53 publications

References 9 publications

Nature of the narrow optical band in H*-aggregates: Dozy-chaos–exciton coupling

Nature of the narrow optical band in H*-aggregates: Dozy-chaos–exciton coupling

J‐Aggregate: von ihrer zufälligen Entdeckung bis zum gezielten supramolekularen Aufbau funktioneller Farbstoffmaterialien

J‐Aggregates: From Serendipitous Discovery to Supramolecular Engineering of Functional Dye Materials

Contact Info

Product

Resources

About