1
|
Fluorescent H-aggregates of pure rhodamine B (RhB) in glycerol, ethylene glycol, methanol and butanol under ambient condition. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
2
|
Narayan Yadav S, Rai S, Shah P, Roy N, Bhattarai A. Spectrophotometric and conductometric studies on the interaction of surfactant with polyelectrolyte in the presence of dye in aqueous medium. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
3
|
Optical, Fluorescence Lifetime, Sensing and DNA Binding Studies of a Laser Dye. J SOLUTION CHEM 2020. [DOI: 10.1007/s10953-020-01000-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
4
|
Rajan D, Ilanchelian M. Exploring the interaction of Azure dyes with t-RNA by hybrid spectroscopic and computational approaches and its applications toward human lung cancer cell line. Int J Biol Macromol 2018; 113:1052-1061. [DOI: 10.1016/j.ijbiomac.2018.02.164] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 02/06/2018] [Accepted: 02/28/2018] [Indexed: 11/26/2022]
|
5
|
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: 761] [Impact Index Per Article: 126.8] [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.
Collapse
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
| |
Collapse
|
6
|
Debnath C, Shil A, Hussain SA, Bhattacharjee D. Metal ion-induced H-aggregation of a water-soluble anionic dye Congo red (CR) in Langmuir–Blodgett (LB) film. Supramol Chem 2016. [DOI: 10.1080/10610278.2016.1250897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
| | - Ashis Shil
- Thin Film and Nanoscience Lab, Department of Physics, Tripura University, Agartala, India
| | - S. A. Hussain
- Thin Film and Nanoscience Lab, Department of Physics, Tripura University, Agartala, India
| | - D. Bhattacharjee
- Thin Film and Nanoscience Lab, Department of Physics, Tripura University, Agartala, India
| |
Collapse
|
7
|
Stehr V, Fink RF, Deibel C, Engels B. Charge carrier mobilities in organic semiconductor crystals based on the spectral overlap. J Comput Chem 2016; 37:2146-56. [DOI: 10.1002/jcc.24441] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 06/10/2016] [Accepted: 06/13/2016] [Indexed: 12/11/2022]
Affiliation(s)
- Vera Stehr
- Institut für Physikalische und Theoretische Chemie, Universität Würzburg; Würzburg 97074 Germany
| | - Reinhold F. Fink
- Institut für Physikalische und Theoretische Chemie, Universität Tübingen; Tübingen 72076 Germany
| | - Carsten Deibel
- Institut für Physik, Technische Universität Chemnitz; Chemnitz 09126 Germany
| | - Bernd Engels
- Institut für Physikalische und Theoretische Chemie, Universität Würzburg; Würzburg 97074 Germany
| |
Collapse
|
8
|
Stehr V, Fink RF, Tafipolski M, Deibel C, Engels B. Comparison of different rate constant expressions for the prediction of charge and energy transport in oligoacenes. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2016. [DOI: 10.1002/wcms.1273] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- V. Stehr
- Institut für Physikalische und Theoretische Chemie; Universität Würzburg; Würzburg Germany
| | - R. F. Fink
- Institut für Physikalische und Theoretische Chemie; Universität Tübingen; Tübingen Germany
| | - M. Tafipolski
- Institut für Physikalische und Theoretische Chemie; Universität Würzburg; Würzburg Germany
| | - C. Deibel
- Institut für Physik; Technische Universität Chemnitz; Chemnitz Germany
| | - B. Engels
- Institut für Physikalische und Theoretische Chemie; Universität Würzburg; Würzburg Germany
| |
Collapse
|
9
|
Fradj AB, Lafi R, Hamouda SB, Gzara L, Hamzaoui AH, Hafiane A. Investigation on the interaction of Safranin T with anionic polyelectrolytes by spectrophotometric method. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 131:169-176. [PMID: 24830630 DOI: 10.1016/j.saa.2014.04.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 03/08/2014] [Accepted: 04/06/2014] [Indexed: 06/03/2023]
Abstract
Understanding the role played by chemical additives such as NaCl salt, acid and Cetylpyridinium Chloride (CPC) surfactant on the interaction between dye and polyelectrolyte contributes to optimization of processes using polyelectrolytes in the removal of dye from aqueous solution. Herein we focus in the interaction between Safranin T, a cationic dye, with two anionic polyelectrolytes, poly(ammonium acrylate) and poly(acrylic acid) using spectrophotometric method and conductivity measurement. In aqueous solution, each of anionic polyelectrolytes forms a complex with the dye and induces a metachromasy indicated by the blue shift of the absorbance of the dye. The stoichiometry of complexes evaluated by the molar ratio method are 1:1 for Safranin T poly(ammonium acrylate) and 2:1 in the case of Safranin T poly(acrylic acid). The effect of additives on the stability of complexes has been studied by varying concentrations of the salt and the surfactant and pH of the solution. The thermodynamic parameters of interaction ΔG, ΔH and ΔS at different temperatures were evaluated to determine the stability constant of the complexes.
Collapse
Affiliation(s)
- Anouar Ben Fradj
- Laboratory of Wastewater Treatment, CERTE, BP 273, Soliman 8020, Tunisia; Laboratory of Valorisation of Materials, CNRSM, BP 95, Hammam-Lif 2050, Tunisia.
| | - Ridha Lafi
- Laboratory of Wastewater Treatment, CERTE, BP 273, Soliman 8020, Tunisia
| | | | - Lassaad Gzara
- Center of Excellence in Desalination Technology, King Abdulaziz University, Jeddah, Saudi Arabia
| | | | - Amor Hafiane
- Laboratory of Wastewater Treatment, CERTE, BP 273, Soliman 8020, Tunisia.
| |
Collapse
|
10
|
Verma P, Pal H. Aggregation studies of dipolar coumarin-153 dye in polar solvents: a photophysical study. J Phys Chem A 2014; 118:6950-64. [PMID: 25093447 DOI: 10.1021/jp506138w] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Photophysical studies have been carried out to explore the aggregation behavior of coumarin-153 (C153) dye in polar organic solvents of both aprotic and protic nature, namely acetonitrile (ACN) and ethanol (EtOH). No unusual behavior is observed in aprotic ACN solvent, suggesting only the monomers of the dye as the single emitting species in the solution. In protic EtOH solvent, however, the dye shows the presence of multiple emitting species in the solution. The concentration-, temperature- and wavelength-dependent changes in the fluorescence decays, and the time-resolved emission spectra (TRES) and area-normalized emission spectra (TRANES) suggest the coexistence of dye aggregates along with the dye monomers in the EtOH solution. Observed results indicate that the emission spectra of the aggregates are substantially blue-shifted compared to the spectra of the monomers, suggesting the H-aggregation of the dye in the present cases. Time-resolved fluorescence anisotropy, ultrafast fluorescence up-conversion measurements and scanning electron microscopy studies support the aggregation of the dye in EtOH solution. Strong dipole-dipole interaction is supposedly responsible for the aggregation of C153 dye (dipole moment ∼6.4 D) and the polar protic solvent EtOH apparently stabilizes the aggregates through solute-solvent hydrogen bonding interaction, which is not possible in aprotic ACN solvent. This is further supported by the time-resolved fluorescence results in a strongly hydrogen bond donating solvent, 2,2,2-trifluoroethanol. Aggregation of C153 dye observed in the present study in polar protic organic solvent is an intriguing finding, as the dye is widely used as a fluorescent probe for various photochemical studies, where overlooking such aggregation will definitely mislead the observed results.
Collapse
Affiliation(s)
- Poonam Verma
- Radioanalytical Chemistry Division, and ‡Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Trombay, Mumbai 400 085, India
| | | |
Collapse
|
11
|
|
12
|
Fradj AB, Lafi R, Hamouda SB, Gzara L, Hamzaoui AH, Hafiane A. Effect of chemical parameters on the interaction between cationic dyes and poly(acrylic acid). J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.04.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
13
|
Stehr V, Fink RF, Engels B, Pflaum J, Deibel C. Singlet Exciton Diffusion in Organic Crystals Based on Marcus Transfer Rates. J Chem Theory Comput 2014; 10:1242-55. [DOI: 10.1021/ct500014h] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Vera Stehr
- Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
| | - Reinhold F. Fink
- Institut
für Physikalische und Theoretische Chemie, Universität Tübingen, 72076 Tübingen, Germany
| | - Bernd Engels
- Institut für Physikalische und Theoretische Chemie, Universität Würzburg, 97074 Würzburg, Germany
| | - Jens Pflaum
- Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
| | - Carsten Deibel
- Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
| |
Collapse
|
14
|
Stehr V, Engels B, Deibel C, Fink RF. Anisotropy of singlet exciton diffusion in organic semiconductor crystals from ab initio approaches. J Chem Phys 2014; 140:024503. [DOI: 10.1063/1.4858464] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
15
|
Shaller AD, Wang W, Li A, Moyna G, Han JJ, Helms GL, Li ADQ. Sequence-Controlled Oligomers Fold into Nanosolenoids and Impart Unusual Optical Properties. Chemistry 2011; 17:8350-62. [DOI: 10.1002/chem.201100612] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Indexed: 11/10/2022]
|
16
|
Spectroscopic and Morphological Properties of Divinylbenzoxazolylbiphenyl Thin Films. J Fluoresc 2009; 19:989-96. [DOI: 10.1007/s10895-009-0498-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Accepted: 06/05/2009] [Indexed: 10/20/2022]
|
17
|
Tavazzi S, Raimondo L, Silvestri L, Spearman P, Camposeo A, Polo M, Pisignano D. Dielectric tensor of tetracene single crystals: The effect of anisotropy on polarized absorption and emission spectra. J Chem Phys 2008; 128:154709. [DOI: 10.1063/1.2897436] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
18
|
Ahn TS, Müller AM, Al-Kaysi RO, Spano FC, Norton JE, Beljonne D, Brédas JL, Bardeen CJ. Experimental and theoretical study of temperature dependent exciton delocalization and relaxation in anthracene thin films. J Chem Phys 2008; 128:054505. [DOI: 10.1063/1.2822310] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
19
|
Gierschner J, Ehni M, Egelhaaf HJ, Milián Medina B, Beljonne D, Benmansour H, Bazan GC. Solid-state optical properties of linear polyconjugated molecules: pi-stack contra herringbone. J Chem Phys 2007; 123:144914. [PMID: 16238431 DOI: 10.1063/1.2062028] [Citation(s) in RCA: 177] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The intermolecular arrangement in the solid state and the consequences on the optical and photophysical properties are studied on different derivatives of oligophenylenevinylenes by UV/VIS absorption and angular-resolved polarized fluorescence spectroscopy. Unsubstituted distyrylbenzene (DSB) organizes in a herringbone manner, with the long axes of the molecules oriented in parallel, but the short axes almost perpendicular to each other. Fluorinated distyrylbenzene (F(12)DSB) as well as the DSB:F(12)DSB cocrystals prefer cofacial pi-stacking in the solid state. For all structures, the consequence of the parallel alignment of the transition moments is a strongly blueshifted H-type absorption spectrum and a low radiative rate constant k(F). Significant differences are observed for the emission spectra: the perpendicular arrangement of the short axes in DSB crystals leads to only very weak intermolecular vibronic coupling. Hence the emission spectrum is well structured, very similar to the one in solution. For F(12)DSB and DSB:F(12)DSB, the cofacial arrangement of the adjacent molecules enables strong intermolecular vibronic coupling of adjacent molecules. Thus, an unstructured and strongly redshifted excimerlike emission spectrum is observed. The differences in the electronic nature of the excited states are highlighted by quantum-chemical calculations, revealing the contribution of interchain excitations to the electronic transitions.
Collapse
Affiliation(s)
- Johannes Gierschner
- Laboratory for Chemistry of Novel Materials, Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Mons, Belgium.
| | | | | | | | | | | | | |
Collapse
|
20
|
Da Como E, Loi MA, Murgia M, Zamboni R, Muccini M. J-aggregation in alpha-sexithiophene submonolayer films on silicon dioxide. J Am Chem Soc 2006; 128:4277-81. [PMID: 16569002 DOI: 10.1021/ja056060s] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report on the observation of J-aggregates in submonolayer films of alpha-sexithiophene grown on silicon dioxide. Photoluminescence spectroscopy reveals that submonolayers are formed by molecules lying flat on the substrate with a head to tail configuration. Excitation energy dependence of photoluminescence shows a red-shifted absorption with respect to isolated molecules and a negligible Stokes shift between absorption and emission. The pronounced structural order of J-aggregates is reflected in the fwhm of the emission bands. From time-resolved and low-temperature photoluminescence experiments, we infer a quantum yield of the J-aggregate between 0.6 and 1. The demonstration of spontaneous formation of J-aggregates of pi-conjugated systems on amorphous silicon-based substrates can be relevant for the development of organic-inorganic hybrid photonic devices.
Collapse
Affiliation(s)
- Enrico Da Como
- Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), Consiglio Nazionale delle Ricerche, Bologna, Italy.
| | | | | | | | | |
Collapse
|
21
|
|
22
|
Abstract
A summary of recent advances on the chemistry and photophysics of silylene-spaced divinylarene copolymers is presented. The silicon moieties have been shown to serve as an insulating spacer in these copolymers. The photophysical studies have provided useful insights into how chromophores in polymers interact intramolecularly. Because different chromophores can be regioregularly introduced into the polymeric chain, these copolymers have been extensively used as models for studying energy transfer, light harvesting as well as chiroptical transfer.
Collapse
Affiliation(s)
- Tien-Yau Luh
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106
| | | |
Collapse
|
23
|
|
24
|
Beljonne D, Hennebicq E, Daniel C, Herz LM, Silva C, Scholes GD, Hoeben FJM, Jonkheijm P, Schenning APHJ, Meskers SCJ, Phillips RT, Friend RH, Meijer EW. Excitation Migration along Oligophenylenevinylene-Based Chiral Stacks: Delocalization Effects on Transport Dynamics. J Phys Chem B 2005; 109:10594-604. [PMID: 16852286 DOI: 10.1021/jp050792p] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Atomistic models based on quantum-chemical calculations are combined with time-resolved spectroscopic investigations to explore the migration of electronic excitations along oligophenylenevinylene-based chiral stacks. It is found that the usual Pauli master equation (PME) approach relying on uncoherent transport between individual chromophores underestimates the excitation diffusion dynamics, monitored here by the time decay of the transient polarization anisotropy. A better agreement to experiment is achieved when accounting for excitation delocalization among acceptor molecules, as implemented in a modified version of the PME model. The same models are applied to study light harvesting and trapping in guest-host systems built from oligomers of different lengths.
Collapse
Affiliation(s)
- D Beljonne
- Laboratory of Chemistry of Novel Materials, University of Mons-Hainaut, Place du Parc 20, 7000 Mons, Belgium.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Cheng YJ, Basu S, Luo SJ, Luh TY. Effect of Conjugation Length on Intrachain Chromophore−Chromophore Interaction in Silylene-Spaced Divinyloligoarene Copolymers. Macromolecules 2005. [DOI: 10.1021/ma047713c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yen-Ju Cheng
- Department of Chemistry and Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 106, and Institute of Chemistry, Academia Sinica, Taipei, Taiwan 106
| | - Sourav Basu
- Department of Chemistry and Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 106, and Institute of Chemistry, Academia Sinica, Taipei, Taiwan 106
| | - Shr-Jie Luo
- Department of Chemistry and Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 106, and Institute of Chemistry, Academia Sinica, Taipei, Taiwan 106
| | - Tien-Yau Luh
- Department of Chemistry and Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 106, and Institute of Chemistry, Academia Sinica, Taipei, Taiwan 106
| |
Collapse
|
26
|
Spano FC. Temperature dependent exciton emission from herringbone aggregates of conjugated oligomers. J Chem Phys 2004; 120:7643-58. [PMID: 15267676 DOI: 10.1063/1.1676250] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, the effect of temperature, exciton bandwidth, and size on the photoluminescence spectra of defect-free two-dimensional herringbone aggregates of pi-conjugated oligomers such as oligophenylene vinylene and oligothiophene is investigated theoretically. The model is based on exciton-phonon coupling in two-dimensional herringbone lattices with the exciton deriving from the lowest optical (1Ag-->1Bu) transition and the phonon from the most strongly coupled intramolecular vibrational mode with frequency omega0. Simple analytical expressions are obtained for the line strengths of the emission origin (0-0) and first replica (0-1) as a function of the number of molecules comprising the aggregate, N, the free exciton bandwidth, WD, and the temperature, T. At a given temperature, the 0-0 emission intensity initially scales as N/Nth, where Nth is the superradiant threshold number, but eventually converges to NT/Nth, where NT is the size independent thermal coherence number. NT is inversely proportional to temperature and proportional to the exciton band curvature (omegac) near the band bottom; NT=1+4piomegac/kbT. In striking contrast, the 0-1 line strength is relatively insensitive to temperature and size, but scales as the inverse square of WD+omega0. The insensitivity of the first replica to the exciton coherence number makes the ratio of the 0-0 to 0-1 line strengths a measure of the exciton coherence number. The ratio can be used to test for crystal purity. Comparison to experiments on thin films of quaterthiophene shows that the thermal coherence size is given by NT approximately 1+450/T (K) and that superradiance, which requires NT>Nth, can only be observed at temperatures less than 1 K.
Collapse
Affiliation(s)
- Frank C Spano
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19067, USA.
| |
Collapse
|
27
|
Lim SH, Bjorklund TG, Bardeen CJ. Characterization of Individual Submicron Distyrylbenzene Aggregates Using Temperature-Dependent Picosecond Fluorescence and Atomic Force Microscopy. J Phys Chem B 2004. [DOI: 10.1021/jp0362685] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sang-Hyun Lim
- Department of Chemistry, University of Illinois, 600 S. Mathews Ave., Urbana, Illinois 61801
| | - Thomas G. Bjorklund
- Department of Chemistry, University of Illinois, 600 S. Mathews Ave., Urbana, Illinois 61801
| | - Christopher J. Bardeen
- Department of Chemistry, University of Illinois, 600 S. Mathews Ave., Urbana, Illinois 61801
| |
Collapse
|
28
|
Narwark O, Meskers S, Peetz R, Thorn-Csányi E, Bässler H. Spectroscopic characterization of p-phenylene vinylene (PV) oligomers. Part I: A homologous series of 2,5-diheptyloxy substituted PV-oligomers. Chem Phys 2003. [DOI: 10.1016/s0301-0104(03)00334-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
29
|
Intrachain chromophore interactions in silanylene-spaced divinylbenzene copolymers. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pola.10763] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
30
|
Koren AB, Curtis MD, Francis AH, Kampf JW. Intermolecular interactions in pi-stacked conjugated molecules. Synthesis, structure, and spectral characterization of alkyl bithiazole oligomers. J Am Chem Soc 2003; 125:5040-50. [PMID: 12708853 DOI: 10.1021/ja029216m] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Syntheses are reported of new 4,4'-dialkyl-2,2'-bithiazole oligomers that have alkenoxy side chains that are capable of easy conversion to oligomers with functionalized side chains, e.g., terminally substituted hydroxy chains. The crystal structures of two representative oligomers (4,4',4' ',4' "-tetra-(2-propenoxymethyl)-2,2',5',5' ',2' ',2' "-quaterthiazole (3P2) and 4,4',4' ',4' "-tetra-(3-hydroxypropyloxymethyl)-2,2',5',5' ',2' ',2' "-quaterthiazole (3H2)) were determined; 3P2 crystallizes in a pi-stacked motif with two molecules per unit cell, whereas 3H2 forms pi-stacks that are linked with hydrogen bonds to form infinite two-dimensional sheets with one molecule per unit cell. A comparison of the UV-vis spectra of the compounds in solution and in the solid state provides unequivocal evidence for the presence of a Davydov splitting, W(D) approximately 0.2 eV, in solid 3P2. The spectra are interpreted in the framework of molecular exciton theory to extract a value of the intermolecular transfer integral, J approximately 0.2 eV, for a total exciton bandwidth of ca. 0.8 eV. Monte Carlo calculations were used to determine the density of states of the exciton band and the absorption and emission line shapes of the 0 <-- 0 transition. It is suggested that the "three-humped" absorption profile typical of partially crystalline, regioregular polymers is the "optical signature" of pi-stacking.
Collapse
Affiliation(s)
- Amy B Koren
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA
| | | | | | | |
Collapse
|
31
|
Claudio GC, Bittner ER. Excitation Transfer in Aggregated and Linearly Confined Poly(p-phenylene vinylene) Chains. J Phys Chem A 2003. [DOI: 10.1021/jp027746z] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gil C. Claudio
- Department of Chemistry, University of Houston, Houston, Texas 77204
| | - Eric R. Bittner
- Department of Chemistry, University of Houston, Houston, Texas 77204
| |
Collapse
|
32
|
Spano FC. The fundamental photophysics of conjugated oligomer herringbone aggregates. J Chem Phys 2003. [DOI: 10.1063/1.1521933] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
33
|
Mixing of Frenkel and Charge-Transfer Excitons and Their Quantum Confinement in Thin Films. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1079-4050(03)31005-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|
34
|
Blumstengel S, Meinardi F, Spearman P, Borghesi A, Tubino R, Chirico G. Exciton interactions in oligophenyl nanoaggregates and single crystals. J Chem Phys 2002. [DOI: 10.1063/1.1496480] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
35
|
Spano FC. Absorption and emission in oligo-phenylene vinylene nanoaggregates: The role of disorder and structural defects. J Chem Phys 2002. [DOI: 10.1063/1.1446034] [Citation(s) in RCA: 149] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
36
|
Meskers SCJ, Bender M, Hübner J, Romanovskii YV, Oestreich M, Schenning APHJ, Meijer EW, Bässler H. Interchromophoric Coupling in Oligo(p-phenylenevinylene)-Substituted Poly(propyleneimine) Dendrimers. J Phys Chem A 2001. [DOI: 10.1021/jp0117922] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefan C. J. Meskers
- Institute of Physical Chemistry, Nuclear Chemistry and Macromolecular Chemistry, Philipps-University of Marburg, Hans Meerweinstrasse, D-35032 Marburg, Germany, Institute of Physics, Philipps-University of Marburg, Renthof 5, D-35032 Marburg, Germany, Institute of Spectroscopy, RAS, Troitsk 142092, Russian Federation, Institute of Solid State Physics, University Hannover, Appelstrasse 2, D-30167 Hannover, Germany, and Laboratory for Macromolecular and Organic Chemistry, Eindhoven University of Technology
| | - Markus Bender
- Institute of Physical Chemistry, Nuclear Chemistry and Macromolecular Chemistry, Philipps-University of Marburg, Hans Meerweinstrasse, D-35032 Marburg, Germany, Institute of Physics, Philipps-University of Marburg, Renthof 5, D-35032 Marburg, Germany, Institute of Spectroscopy, RAS, Troitsk 142092, Russian Federation, Institute of Solid State Physics, University Hannover, Appelstrasse 2, D-30167 Hannover, Germany, and Laboratory for Macromolecular and Organic Chemistry, Eindhoven University of Technology
| | - Jens Hübner
- Institute of Physical Chemistry, Nuclear Chemistry and Macromolecular Chemistry, Philipps-University of Marburg, Hans Meerweinstrasse, D-35032 Marburg, Germany, Institute of Physics, Philipps-University of Marburg, Renthof 5, D-35032 Marburg, Germany, Institute of Spectroscopy, RAS, Troitsk 142092, Russian Federation, Institute of Solid State Physics, University Hannover, Appelstrasse 2, D-30167 Hannover, Germany, and Laboratory for Macromolecular and Organic Chemistry, Eindhoven University of Technology
| | - Yu. V. Romanovskii
- Institute of Physical Chemistry, Nuclear Chemistry and Macromolecular Chemistry, Philipps-University of Marburg, Hans Meerweinstrasse, D-35032 Marburg, Germany, Institute of Physics, Philipps-University of Marburg, Renthof 5, D-35032 Marburg, Germany, Institute of Spectroscopy, RAS, Troitsk 142092, Russian Federation, Institute of Solid State Physics, University Hannover, Appelstrasse 2, D-30167 Hannover, Germany, and Laboratory for Macromolecular and Organic Chemistry, Eindhoven University of Technology
| | - Michael Oestreich
- Institute of Physical Chemistry, Nuclear Chemistry and Macromolecular Chemistry, Philipps-University of Marburg, Hans Meerweinstrasse, D-35032 Marburg, Germany, Institute of Physics, Philipps-University of Marburg, Renthof 5, D-35032 Marburg, Germany, Institute of Spectroscopy, RAS, Troitsk 142092, Russian Federation, Institute of Solid State Physics, University Hannover, Appelstrasse 2, D-30167 Hannover, Germany, and Laboratory for Macromolecular and Organic Chemistry, Eindhoven University of Technology
| | - Albertus P. H. J. Schenning
- Institute of Physical Chemistry, Nuclear Chemistry and Macromolecular Chemistry, Philipps-University of Marburg, Hans Meerweinstrasse, D-35032 Marburg, Germany, Institute of Physics, Philipps-University of Marburg, Renthof 5, D-35032 Marburg, Germany, Institute of Spectroscopy, RAS, Troitsk 142092, Russian Federation, Institute of Solid State Physics, University Hannover, Appelstrasse 2, D-30167 Hannover, Germany, and Laboratory for Macromolecular and Organic Chemistry, Eindhoven University of Technology
| | - E. W. Meijer
- Institute of Physical Chemistry, Nuclear Chemistry and Macromolecular Chemistry, Philipps-University of Marburg, Hans Meerweinstrasse, D-35032 Marburg, Germany, Institute of Physics, Philipps-University of Marburg, Renthof 5, D-35032 Marburg, Germany, Institute of Spectroscopy, RAS, Troitsk 142092, Russian Federation, Institute of Solid State Physics, University Hannover, Appelstrasse 2, D-30167 Hannover, Germany, and Laboratory for Macromolecular and Organic Chemistry, Eindhoven University of Technology
| | - Heinz Bässler
- Institute of Physical Chemistry, Nuclear Chemistry and Macromolecular Chemistry, Philipps-University of Marburg, Hans Meerweinstrasse, D-35032 Marburg, Germany, Institute of Physics, Philipps-University of Marburg, Renthof 5, D-35032 Marburg, Germany, Institute of Spectroscopy, RAS, Troitsk 142092, Russian Federation, Institute of Solid State Physics, University Hannover, Appelstrasse 2, D-30167 Hannover, Germany, and Laboratory for Macromolecular and Organic Chemistry, Eindhoven University of Technology
| |
Collapse
|
37
|
Ruseckas A, Namdas EB, Ganguly T, Theander M, Svensson M, Andersson MR, Inganäs O, Sundström V. Intra- and Interchain Luminescence in Amorphous and Semicrystalline Films of Phenyl-Substituted Polythiophene. J Phys Chem B 2001. [DOI: 10.1021/jp010511n] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arvydas Ruseckas
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden, Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM), Linköping University, SE-58183 Linköping, Sweden, and Departments of Organic Chemistry and Polymer Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Ebinazar B. Namdas
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden, Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM), Linköping University, SE-58183 Linköping, Sweden, and Departments of Organic Chemistry and Polymer Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Tapan Ganguly
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden, Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM), Linköping University, SE-58183 Linköping, Sweden, and Departments of Organic Chemistry and Polymer Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Mathias Theander
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden, Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM), Linköping University, SE-58183 Linköping, Sweden, and Departments of Organic Chemistry and Polymer Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Mattias Svensson
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden, Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM), Linköping University, SE-58183 Linköping, Sweden, and Departments of Organic Chemistry and Polymer Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Mats R. Andersson
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden, Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM), Linköping University, SE-58183 Linköping, Sweden, and Departments of Organic Chemistry and Polymer Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Olle Inganäs
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden, Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM), Linköping University, SE-58183 Linköping, Sweden, and Departments of Organic Chemistry and Polymer Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Villy Sundström
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden, Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM), Linköping University, SE-58183 Linköping, Sweden, and Departments of Organic Chemistry and Polymer Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| |
Collapse
|
38
|
Spano FC. Absorption and emission in pinwheel aggregates of oligo-phenylene vinylene molecules. J Chem Phys 2001. [DOI: 10.1063/1.1349056] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
39
|
Politis JK, Nemes JC, Curtis MD. Synthesis and characterization of regiorandom and regioregular poly(3-octylfuran). J Am Chem Soc 2001; 123:2537-47. [PMID: 11456922 DOI: 10.1021/ja003588i] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly(3-octylfuran) has been synthesized with three regioregularities: P3OF-95, P3OF-75, and P3OF-50, where the number signifies the percentage HT content. The 95% HT material is highly crystalline with a structure similar to that of HT-poly(3-octylthiophene), P3OT. The lamellar spacing is 22.1 A and the pi-stacking distance is 3.81 A. UV-vis spectroscopy reveals that P3OF-95 is aggregated in CHCl(3) solution, and solid films of P3OF-95, but not P3OF-75 or -50, show Davydov and exciton band splitting due to the interactions of the pi-systems in the stacked morphology. An estimate of the Davydov splitting is 0.15 eV (1200 cm(-1)). P3OF is reversibly oxidized at 0.32 V vs ferrocene/ferrocenium, but increasing the potential to 1.15 V leads to irreversible oxidation. Films of P3OF may be p-doped with iodine vapor. Doped P3OF-95 and -75 films have electrical conductivities of 10(-2) and 10(-7) S/cm, respectively. The UV-vis-NIR spectra of the iodine-doped films are interpreted in terms of molecular-like transitions involving the LUMO, HOMO, HOMO-1, and transitions across a Peierls distortion-induced gap in the intermolecular conduction band that is formed by the overlap of the pi-systems of the stacked partially oxidized chains. The conduction band gap estimated for P3OF-95 is 0.34 eV, and that for P3OF-75 is 0.9 eV. The P3OF samples are thermally stable in N(2) atmosphere to between 275 degrees C (P3OF-50) and 380 degrees C (P3OF-95), but suffer thermal oxidation above 150 degrees C or light-induced oxidation at room temperature.
Collapse
Affiliation(s)
- J K Politis
- Willard H. Dow Laboratory, Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, USA
| | | | | |
Collapse
|
40
|
Spano FC. Emission from aggregates of oligo-phenylene vinylenes: a recipe for superradiant H-aggregates. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)01153-2] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
41
|
Meskers SC, Janssen RA, Haverkort JE, Wolter JH. Relaxation of photo-excitations in films of oligo- and poly-(para-phenylene vinylene) derivatives. Chem Phys 2000. [DOI: 10.1016/s0301-0104(00)00252-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|