Synthesis and characterization of a J-aggregating TDBC derivative in solution and in Langmuir–Blodgett films

Aviv, Hagit; Tischler, Yaakov R.

doi:10.1016/j.jlumin.2014.10.019

Cited by 11 publications

(14 citation statements)

References 52 publications

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“…9 For nonlinear superstructures, the incommensurability between the anisotropy of transition dipoles and their local 2D geometry forbids a direct assignment of specific geometric parameters from the monomer-aggregate peak shift. [33][34][35][36][37][38][39][40] In this contribution, we propose a generalized framework extending Kasha's theory for 1D systems to 2D systems for extracting key microscopic packing parameters. This is possible using T-dependent linear spectroscopy and taking into account the direction of the absorption peak shift with increasing temperature, which is easily available experimentally owing to the establishment of sucrose encapsulation methods.…”

Section: Introductionmentioning

confidence: 99%

Generalized Kasha’s Model: T-Dependent Spectroscopy Reveals Short-Range Structures of 2D Excitonic Systems

Chuang

Bennett

Caram

et al. 2019

Chem

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Section: Introductionmentioning

confidence: 99%

Generalized Kasha’s Model: T-Dependent Spectroscopy Reveals Short-Range Structures of 2D Excitonic Systems

Chuang

Bennett

Caram

et al. 2019

Chem

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“…Figure 3 compares the results of the experiment [50] with the result of fitting them to the theoretical result (6)- (26) for optical absorption and the same theoretical result, in which the sign in the heat energy    is changed to negative (Section 10.1), for luminescence (fluorescence). In the experiment, a very small Stokes shift was obtained for the J-band [50]. Therefore, we are forced to assume that the energy gap between the ground and excited electron states for fluorescence is greater than this gap for optical absorption [3].…”

Section: Optical Spectra Nature Of the Small Stokes Shift And Dynammentioning

confidence: 93%

“…A striking example of the considered molecular "quantum" transitions, with the dynamics of their transient states taken into account, are the "quantum" transitions in the basic optical chromophore of J-aggregates of polymethine dyes embedded in a solvent-in the system "J-aggregate + environment" [4][5][6][7][8]10,11]. Figure 3 compares the results of the experiment [50] with the result of fitting them to the theoretical result (6)- (26) for optical absorption and the same theoretical result, in which the sign in the heat energy ω 12 is changed to negative (Section 10.1), for luminescence (fluorescence). In the experiment, a very small Stokes shift was obtained for the J-band [50].…”

Section: Optical Spectra Nature Of the Small Stokes Shift And Dynammentioning

confidence: 99%

Dynamic Symmetry in Dozy-Chaos Mechanics

Егоров

2020

Symmetry

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All kinds of dynamic symmetries in dozy-chaos (quantum-classical) mechanics (Egorov, V.V. Challenges 2020, 11, 16; Egorov, V.V. Heliyon Physics 2019, 5, e02579), which takes into account the chaotic dynamics of the joint electron-nuclear motion in the transient state of molecular “quantum” transitions, are discussed. The reason for the emergence of chaotic dynamics is associated with a certain new property of electrons, consisting in the provocation of chaos (dozy chaos) in a transient state, which appears in them as a result of the binding of atoms by electrons into molecules and condensed matter and which provides the possibility of reorganizing a very heavy nuclear subsystem as a result of transitions of light electrons. Formally, dozy chaos is introduced into the theory of molecular “quantum” transitions to eliminate the significant singularity in the transition rates, which is present in the theory when it goes beyond the Born–Oppenheimer adiabatic approximation and the Franck–Condon principle. Dozy chaos is introduced by replacing the infinitesimal imaginary addition in the energy denominator of the full Green’s function of the electron-nuclear system with a finite value, which is called the dozy-chaos energy γ. The result for the transition-rate constant does not change when the sign of γ is changed. Other dynamic symmetries appearing in theory are associated with the emergence of dynamic organization in electronic-vibrational transitions, in particular with the emergence of an electron-nuclear-reorganization resonance (the so-called Egorov resonance) and its antisymmetric (chaotic) “twin”, with direct and reverse transitions, as well as with different values of the electron–phonon interaction in the initial and final states of the system. All these dynamic symmetries are investigated using the simplest example of quantum-classical mechanics, namely, the example of quantum-classical mechanics of elementary electron-charge transfers in condensed media.

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“…(4), (6) L L → − . (17) Theoretical absorption and fluorescence spectra [26], fitted to the experimental data [43] on the J-aggregates, are shown in Figure 9. The asymmetry of the shape of the fluorescence band with respect to the shape of the absorption band and its smaller width are explained by better self-organization of the dynamics of elementary acts of photon emission by pi-electrons of J-aggregates compared with the self-organization of the dynamics of elementary events of their photon absorption [26].…”

Section: Organization Of Absorption and Luminescence Spectramentioning

confidence: 99%

“…Experimental[43] (a) and theoretical[26] (b) absorption and fluorescence spectra of a C18S4 aqueous solution[43].…”

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confidence: 99%

Quantum-Classical Electron as an Organizing Principle in Nature

Егоров¹

2020

IJSTS

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We are introducing briefly to the new theory of "quantum" transitions in molecular and chemical physicsquantum-classical mechanics, in which an electron behaves dynamically in two ways: both as a quantum and as a classical elementary particle. Namely, in the initial and final adiabatic states of molecular "quantum" transitions, the light electron exhibits its quantum properties. On the contrary, in the transient molecular state, the electron, provoking the so-called dozy chaos in the vibrational motion of very heavy nuclei "in order" to shift the equilibrium positions of their vibrations to new positions corresponding to the new distribution of the electron charge, because of the continuous energy spectrum in the transient state, manifests itself as a classical elementary particle. The article discusses mainly studied and some promising applications of the organizing role of an electron in nature. Among the well-studied applications, the quantum-classical organization of optical absorption band shapes in polymethine dyes and their J-aggregates is discussed. For example, the well-known narrow and intense J-band of J-aggregates is one of the striking examples of the implementation of the so-called Egorov resonance, in which the motion of the reorganization of the nuclei of the environmental medium significantly contributes to the electron transition in the optical pi-electron chromophore of J-aggregates. This effect can also be interpreted as the transfer of dozy chaos from the peak of the J-band into its wing by a chaotic motion of the quantum-classical pi-electron state of the J-chromophore. The dynamic role of the quantum-classical electron in the joint organization of the absorption and luminescence spectra, and an extension of quantum-classical mechanics to nonlinear optical processes are discussed. The probable leading role of quantum-classical electrons in the evolution of molecular matter and possibility of applications of quantum-classical mechanics to the study of cancer and viruses are discussed as a future research perspective.

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Synthesis and characterization of a J-aggregating TDBC derivative in solution and in Langmuir–Blodgett films

Cited by 11 publications

References 52 publications

Generalized Kasha’s Model: T-Dependent Spectroscopy Reveals Short-Range Structures of 2D Excitonic Systems

Generalized Kasha’s Model: T-Dependent Spectroscopy Reveals Short-Range Structures of 2D Excitonic Systems

Dynamic Symmetry in Dozy-Chaos Mechanics

Quantum-Classical Electron as an Organizing Principle in Nature

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