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Moritaka SS, Lebedev VS. Orientational effects in the polarized absorption spectra of molecular aggregates. J Chem Phys 2024; 160:074901. [PMID: 38364011 DOI: 10.1063/5.0188128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 01/23/2024] [Indexed: 02/18/2024] Open
Abstract
We present a detailed theoretical analysis of polarized absorption spectra and linear dichroism of cyanine dye aggregates whose unit cells contain two molecules. The studied threadlike ordered system with a molecular exciton delocalized along its axis can be treated as two chains of conventional molecular aggregates, rotated relative to each other at a certain angle around the aggregate axis. Our approach is based on the general formulas for the effective cross section of light absorption by a molecular aggregate and key points of the molecular exciton theory. We have developed a self-consistent theory for describing the orientational effects in the absorption and dichroic spectra of such supramolecular structures with nonplanar unit cell. It is shown that the spectral behavior of such systems exhibits considerable distinctions from that of conventional cyanine dye aggregates. They consist in the strong dependence of the relative intensities of the J- and H-type spectral bands of the aggregate with a nonplanar unit cell on the angles determining the mutual orientations of the transition dipole moments of constituting molecules and the aggregate axis as well as on the polarization direction of incident light. The derived formulas are reduced to the well-known analytical expressions in the particular case of aggregates with one molecule in the unit cell. The calculations performed within the framework of our excitonic theory combined with available vibronic theory allow us to quite reasonably explain the experimental data for the pseudoisocyanine bromide dye aggregate.
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Affiliation(s)
- S S Moritaka
- P. N. Lebedev Physical Institute of Russian Academy of Sciences, 53 Leninskiy Prosp., 119991 Moscow, Russian Federation
| | - V S Lebedev
- P. N. Lebedev Physical Institute of Russian Academy of Sciences, 53 Leninskiy Prosp., 119991 Moscow, Russian Federation
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Hestand NJ, Spano FC. Expanded Theory of H- and J-Molecular Aggregates: The Effects of Vibronic Coupling and Intermolecular Charge Transfer. Chem Rev 2018; 118:7069-7163. [PMID: 29664617 DOI: 10.1021/acs.chemrev.7b00581] [Citation(s) in RCA: 739] [Impact Index Per Article: 123.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The electronic excited states of molecular aggregates and their photophysical signatures have long fascinated spectroscopists and theoreticians alike since the advent of Frenkel exciton theory almost 90 years ago. The influence of molecular packing on basic optical probes like absorption and photoluminescence was originally worked out by Kasha for aggregates dominated by Coulombic intermolecular interactions, eventually leading to the classification of J- and H-aggregates. This review outlines advances made in understanding the relationship between aggregate structure and photophysics when vibronic coupling and intermolecular charge transfer are incorporated. An assortment of packing geometries is considered from the humble molecular dimer to more exotic structures including linear and bent aggregates, two-dimensional herringbone and "HJ" aggregates, and chiral aggregates. The interplay between long-range Coulomb coupling and short-range charge-transfer-mediated coupling strongly depends on the aggregate architecture leading to a wide array of photophysical behaviors.
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Affiliation(s)
- Nicholas J Hestand
- Department of Chemistry , Temple University , Philadelphia , Pennsylvania 19122 , United States
| | - Frank C Spano
- Department of Chemistry , Temple University , Philadelphia , Pennsylvania 19122 , United States
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Bujdák J, Iyi N, Hrobáriková J, Fujita T. Aggregation and Decomposition of a Pseudoisocyanine Dye in Dispersions of Layered Silicates. J Colloid Interface Sci 2002; 247:494-503. [PMID: 16290491 DOI: 10.1006/jcis.2001.8140] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2001] [Accepted: 11/24/2001] [Indexed: 11/22/2022]
Abstract
The optical properties of reaction systems composed from a pseudoisocyanine (PIC) solution and dispersed layered silicates were studied using visible spectroscopy. Two series of reduced-charge montmorillonites were used as the silicate materials. Each series consisted of eight samples with different layer charges, which were prepared from one parent material. Observed trends were verified with another series of dioctahedral and trioctahedral smectites of different layer charges, structure, and origin. The layer charge density of the silicates significantly affected the aggregation of PIC cations. In addition to the formation of J-aggregates, dye spectral bleaching was also observed. Silicates with very low charge densities induced neither significant aggregation nor spectral bleaching of the dye. The highest levels of PIC J-aggregate formation were found in dispersions of the layered silicates with a medium surface charge. However, reversible spectral bleaching was also observed in some cases. PIC dye cations probably change their conformations during the adsorption process, due to the tension resulting from the large size of the cations and the relatively high charge density at the silicate surface. The bleached dye recovers, at least partially, with the rearrangement and redistribution of the dye cations over the time. In contrast, the presence of silicates with very high charge densities (synthetic taeniolite and fluorohectorite) led to the very fast and irreversible decomposition of the PIC. Perhaps, the tension in adsorbed dye cations, induced by the high charge density at the silicate surface, resulted in significant destabilization and a decomposition reaction of the chromophore.
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Affiliation(s)
- Juraj Bujdák
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava, SK-84236, Slovak Republic.
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von Berlepsch H, Möller S, Dähne L. Optical Properties of Crystalline Pseudoisocyanine (PIC). J Phys Chem B 2001. [DOI: 10.1021/jp004581q] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hans von Berlepsch
- Institut für Chemie-Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany, Fachbereich Physik der Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany, and Max-Planck-Institut für Kolloid und Grenzflächenforschung, D-14424 Potsdam, Germany
| | - Sven Möller
- Institut für Chemie-Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany, Fachbereich Physik der Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany, and Max-Planck-Institut für Kolloid und Grenzflächenforschung, D-14424 Potsdam, Germany
| | - Lars Dähne
- Institut für Chemie-Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany, Fachbereich Physik der Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany, and Max-Planck-Institut für Kolloid und Grenzflächenforschung, D-14424 Potsdam, Germany
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Gallos LK, Pimenov AV, Scheblykin IG, Van der Auweraer M, Hungerford G, Varnavsky OP, Vitukhnovsky AG, Argyrakis P. A Kinetic Model for J-Aggregate Dynamics. J Phys Chem B 2000. [DOI: 10.1021/jp993655z] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- L. K. Gallos
- Department of Physics, University of Thessaloniki, 54006 Thessaloniki, Greece, Lebedev Physical Institute and Lebedev Research Center in Physics, Leninsky Prospect 53, Moscow 117924, Russia, and Laboratory for Molecular Dynamics and Spectroscopy, K. U. Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - A. V. Pimenov
- Department of Physics, University of Thessaloniki, 54006 Thessaloniki, Greece, Lebedev Physical Institute and Lebedev Research Center in Physics, Leninsky Prospect 53, Moscow 117924, Russia, and Laboratory for Molecular Dynamics and Spectroscopy, K. U. Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - I. G. Scheblykin
- Department of Physics, University of Thessaloniki, 54006 Thessaloniki, Greece, Lebedev Physical Institute and Lebedev Research Center in Physics, Leninsky Prospect 53, Moscow 117924, Russia, and Laboratory for Molecular Dynamics and Spectroscopy, K. U. Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - M. Van der Auweraer
- Department of Physics, University of Thessaloniki, 54006 Thessaloniki, Greece, Lebedev Physical Institute and Lebedev Research Center in Physics, Leninsky Prospect 53, Moscow 117924, Russia, and Laboratory for Molecular Dynamics and Spectroscopy, K. U. Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - G. Hungerford
- Department of Physics, University of Thessaloniki, 54006 Thessaloniki, Greece, Lebedev Physical Institute and Lebedev Research Center in Physics, Leninsky Prospect 53, Moscow 117924, Russia, and Laboratory for Molecular Dynamics and Spectroscopy, K. U. Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - O. P. Varnavsky
- Department of Physics, University of Thessaloniki, 54006 Thessaloniki, Greece, Lebedev Physical Institute and Lebedev Research Center in Physics, Leninsky Prospect 53, Moscow 117924, Russia, and Laboratory for Molecular Dynamics and Spectroscopy, K. U. Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - A. G. Vitukhnovsky
- Department of Physics, University of Thessaloniki, 54006 Thessaloniki, Greece, Lebedev Physical Institute and Lebedev Research Center in Physics, Leninsky Prospect 53, Moscow 117924, Russia, and Laboratory for Molecular Dynamics and Spectroscopy, K. U. Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - P. Argyrakis
- Department of Physics, University of Thessaloniki, 54006 Thessaloniki, Greece, Lebedev Physical Institute and Lebedev Research Center in Physics, Leninsky Prospect 53, Moscow 117924, Russia, and Laboratory for Molecular Dynamics and Spectroscopy, K. U. Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
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