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Takaya T, Shinohara M, Iwata K. Torsional relaxation dynamics of vinylene groups in photoexcited MEH-PPV as studied by time-resolved resonance stimulated Raman spectroscopy in the 900–1500 nm region. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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2
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Costa PMM, Meira R, Charas A, Di Paolo RE. Photophysical Study of Two p-Phenylenevinylene Oligomers End-Capped with Triphenylamine or Cyanoacetate Groups. ChemistrySelect 2016. [DOI: 10.1002/slct.201600661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Pedro M. M. Costa
- Centro de Química Estrutural; Departamento de Engenharia Química; Instituto Superior Técnico, Universidade de Lisboa; Av. Rovisco Pais 1, P-1049-001 Lisboa Portugal
| | - Rui Meira
- Instituto de Telecomunicações; Instituto Superior Técnico; Av. Rovisco Pais 1, P-1049-001 Lisboa Portugal
| | - Ana Charas
- Instituto de Telecomunicações; Instituto Superior Técnico; Av. Rovisco Pais 1, P-1049-001 Lisboa Portugal
| | - Roberto E. Di Paolo
- Centro de Química Estrutural; Departamento de Engenharia Química; Instituto Superior Técnico, Universidade de Lisboa; Av. Rovisco Pais 1, P-1049-001 Lisboa Portugal
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3
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Ren F, Zheng YF, Liu XM, Yue XY, Ma L, Li WG, Lai F, Liu JL, Guan WL. An investigation of the oxidation mechanism of abietic acid using two-dimensional infrared correlation spectroscopy. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.12.055] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Meira R, Costa PMM, Di Paolo RE, Morgado J, Alcácer L, Bastos JP, Cheyns D, Charas A. Synthesis and optical properties of a new triphenylamine-p-phenylenevinylene-small molecule with applications in high open-circuit voltage organic solar cells. NEW J CHEM 2015. [DOI: 10.1039/c5nj01525a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescence quenching studies enabled us to preview applications of a new small molecule as electron-donor in OSCs. Planar heterojunction cells are also shown.
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Affiliation(s)
- Rui Meira
- Instituto de Telecomunicações
- Instituto Superior Técnico
- Lisboa
- Portugal
| | - Pedro M. M. Costa
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- Lisboa
- Portugal
| | - Roberto E. Di Paolo
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- Lisboa
- Portugal
| | - Jorge Morgado
- Instituto de Telecomunicações
- Instituto Superior Técnico
- Lisboa
- Portugal
- Departamento de Bioengenharia
| | - Luís Alcácer
- Instituto de Telecomunicações
- Instituto Superior Técnico
- Lisboa
- Portugal
| | | | | | - Ana Charas
- Instituto de Telecomunicações
- Instituto Superior Técnico
- Lisboa
- Portugal
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5
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Costa T, Garner LE, Knaapila M, Thomas AW, Rogers SE, Bazan GC, Burrows HD. Aggregation properties of p-phenylene vinylene based conjugated oligoelectrolytes with surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10047-10058. [PMID: 23822142 DOI: 10.1021/la401871x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The amphiphilic properties of conjugated oligoelectrolytes (COE) and their sensitivity to the polarity of their microenvironment lead to interesting aggregation behavior, in particular in their interaction with surfactants. Photoluminescence (PL) spectroscopy, liquid-phase atomic force microscopy, small-angle neutron scattering, small-angle X-ray scattering, and grazing-incidence X-ray diffraction were used to examine interactions between cationic p-phenylene vinylene based oligoelectrolytes and surfactants. These techniques indicate the formation of COE/surfactant aggregates in aqueous solution, and changes in the photophysical properties are observed when compared to pure aqueous solutions. We evaluate the effect of the charge of the surfactant polar headgroup, the size of the hydrophobic chain, and the role of counterions. At low COE concentrations (micromolar), it was found that these COEs display larger emission quantum efficiencies upon incorporation into micelles, along with marked blue-shifts of the PL spectra. This effect is most pronounced in the series of anionic surfactants, and the degree of blue shifts as a function of surfactant charge is as follows: cationic < nonionic < anionic surfactants. In anionic surfactants, such as sodium dodecyl sulfate (SDS), the PL spectra show vibronic resolution above the critical micelle concentration of the surfactant, suggesting more rigid structures. Scattering data indicate that in aqueous solutions, trimers appear as essentially 3-dimensional particles, while tetra- and pentamers form larger, cylindrical particles. When the molar ratio of nonionic C12E5 surfactant to 1,4-bis(4-{N,N-bis-[(N,N,N-trimethylammonium)hexyl]amino}-styryl)benzene tetraiodide (DSBNI) is close to one, the size of the formed DSBNI-C12E5 particles corresponds to the full coverage of individual oligomers. When these particles are transferred into thin films, they organize into a cubic in-plane pattern. If anionic SDS is added, the formed DSBNI-SDS particles are larger than expected for full surfactant coverage, and particles may thus contain several oligomers. This tendency is attributed to the merging of DSBNI oligomers due to the charge screening and, thus, reduced water solubility.
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Affiliation(s)
- Telma Costa
- Chemistry Department, University of Coimbra, Coimbra 3004-535, Portugal.
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6
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Pina J, Seixas de Melo JS, Koenen N, Scherf U. Chain Length Dependent Excited-State Decay Processes of Diluted PF2/6 Solutions. J Phys Chem B 2013; 117:7370-80. [DOI: 10.1021/jp4017163] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- João Pina
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra,
Portugal
| | | | - Niels Koenen
- Makromolekulare
Chemie, Bergische Universität Wuppertal, Gaußtraße
20, 42097 Wuppertal, Germany
| | - Ulli Scherf
- Makromolekulare
Chemie, Bergische Universität Wuppertal, Gaußtraße
20, 42097 Wuppertal, Germany
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7
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Galvão AM, Di Paolo RE, Maçanita AL, Naqvi KR. Model for conformational relaxation of flexible conjugated polymers: application to p-phenylenevinylene trimers in nonpolar solvents. Chemphyschem 2013; 14:583-90. [PMID: 23364935 DOI: 10.1002/cphc.201200869] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Indexed: 11/08/2022]
Abstract
Photoexcitation of flexible conjugated polymers is invariably followed by a fast conformational/torsional relaxation towards a configuration favouring coplanarity of the conjugated segments. In general, the experimental relaxation rate constant (k(CR)) depends on the solvent viscosity (η) and temperature (T), and is not proportional to T/η. A theory capable of explaining the observed dependence of k(CR) on T and η over a wide range of these variables is not available. This gap is filled here by presenting a stochastic model that includes the participation of the oligomer side chain in storing and dissipating the stresses induced by photoexcitation. The model is able to account for the softening of solute-solvent interactions and its predictions are found to be in excellent agreement with the observed relaxation rate constants of a series of substituted p-phenylenevinylene trimers [ChemPhysChem 2009, 10, 448-454] on T, η and the size of the side-chains.
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Affiliation(s)
- Adelino M Galvão
- Centro de Química Estrutural, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais s/n, 1049-001 Lisbon, Portugal.
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8
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Ma YZ, Shaw RW, Yu X, O’Neill HM, Hong K. Excited-State Dynamics of Water-Soluble Polythiophene Derivatives: Temperature and Side-Chain Length Effects. J Phys Chem B 2012; 116:14451-60. [DOI: 10.1021/jp304526h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ying-Zhong Ma
- Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge,
Tennessee 37831, United States
| | - Robert W. Shaw
- Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge,
Tennessee 37831, United States
| | - Xiang Yu
- Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge,
Tennessee 37831, United States
| | - Hugh M. O’Neill
- Center for Structural Molecular Biology, Biology & Soft Matter Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
| | - Kunlun Hong
- Center for Nanophase Materials
Sciences, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
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9
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Ferreira B, da Silva PF, Seixas de Melo JS, Pina J, Maçanita A. Excited-State Dynamics and Self-Organization of Poly(3-hexylthiophene) (P3HT) in Solution and Thin Films. J Phys Chem B 2012; 116:2347-55. [DOI: 10.1021/jp207418q] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bruno Ferreira
- Centro de Química
Estrutural,
Instituto Superior Técnico, Technical University of Lisbon, Avenida Rovisco Pais s/n, 1049-001 Lisbon,
Portugal
| | - Palmira Ferreira da Silva
- Centro de Química
Estrutural,
Instituto Superior Técnico, Technical University of Lisbon, Avenida Rovisco Pais s/n, 1049-001 Lisbon,
Portugal
| | | | - João Pina
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra,
Portugal
| | - António Maçanita
- Centro de Química
Estrutural,
Instituto Superior Técnico, Technical University of Lisbon, Avenida Rovisco Pais s/n, 1049-001 Lisbon,
Portugal
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10
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Suresh D, Gomes CSB, Gomes PT, Di Paolo RE, Maçanita AL, Calhorda MJ, Charas A, Morgado J, Teresa Duarte M. Syntheses and photophysical properties of new iminopyrrolyl boron complexes and their application in efficient single-layer non-doped OLEDs prepared by spin coating. Dalton Trans 2012; 41:8502-5. [DOI: 10.1039/c2dt30487b] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Guerlin A, Dumur F, Dumas E, Miomandre F, Wantz G, Mayer CR. Tunable optical properties of chromophores derived from oligo(p-phenylene vinylene). Org Lett 2010; 12:2382-5. [PMID: 20433139 DOI: 10.1021/ol1007263] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A series of 11 symmetric push-pull chromophores consisting of electron-accepting groups connected through a central pi-conjugated system derived from oligo(p-phenylene vinylene) (OPV) were designed and synthesized. Electronic and spectroscopic properties were investigated by UV-visible absorption, fluorescence spectroscopy, and cyclic voltammetry. By finely tuning the electron-withdrawing ability of the acceptors as well as the length of the pi-conjugated spacer, a wide range of dyes exhibiting strong absorption and emission were obtained.
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Affiliation(s)
- Audrey Guerlin
- Institut Lavoisier de Versailles, Université de Versailles Saint Quentin, UMR 8180 CNRS, 45 avenue des Etats-Unis, 78035 Versailles cedex, France
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12
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Rodrigues RF, Charas A, Morgado J, Maçanita A. Self-Organization and Excited-State Dynamics of a Fluorene−Bithiophene Copolymer (F8T2) in Solution. Macromolecules 2009. [DOI: 10.1021/ma902096p] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rita França Rodrigues
- Centro de Química Estrutural, Instituto Superior Técnico, Technical University of Lisbon, 1049-001 Lisboa, Portugal
| | - Ana Charas
- Instituto de Telecomunicações, Instituto Superior Técnico, 1049-001 Lisboa, Portugal
| | - Jorge Morgado
- Instituto de Telecomunicações, Instituto Superior Técnico, 1049-001 Lisboa, Portugal
| | - António Maçanita
- Centro de Química Estrutural, Instituto Superior Técnico, Technical University of Lisbon, 1049-001 Lisboa, Portugal
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13
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Pina J, Seixas de Melo J, Burrows HD, Maçanita AL, Galbrecht F, Bünnagel T, Scherf U. Alternating Binaphthyl−Thiophene Copolymers: Synthesis, Spectroscopy, and Photophysics and Their Relevance to the Question of Energy Migration versus Conformational Relaxation. Macromolecules 2009. [DOI: 10.1021/ma802395c] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Pina
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal, Departamento de Engenharia Química e Biológica, Centro de Química Estrutural, Instituto Superior Técnico, Av. Rovisco Pais, s/n. Lisboa, Portugal, and Makromolekulare Chemie, Bergische Universität Wuppertal, Gaussstr. 20, 42097 Wuppertal, Germany
| | - J. Seixas de Melo
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal, Departamento de Engenharia Química e Biológica, Centro de Química Estrutural, Instituto Superior Técnico, Av. Rovisco Pais, s/n. Lisboa, Portugal, and Makromolekulare Chemie, Bergische Universität Wuppertal, Gaussstr. 20, 42097 Wuppertal, Germany
| | - H. D. Burrows
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal, Departamento de Engenharia Química e Biológica, Centro de Química Estrutural, Instituto Superior Técnico, Av. Rovisco Pais, s/n. Lisboa, Portugal, and Makromolekulare Chemie, Bergische Universität Wuppertal, Gaussstr. 20, 42097 Wuppertal, Germany
| | - A. L. Maçanita
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal, Departamento de Engenharia Química e Biológica, Centro de Química Estrutural, Instituto Superior Técnico, Av. Rovisco Pais, s/n. Lisboa, Portugal, and Makromolekulare Chemie, Bergische Universität Wuppertal, Gaussstr. 20, 42097 Wuppertal, Germany
| | - F. Galbrecht
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal, Departamento de Engenharia Química e Biológica, Centro de Química Estrutural, Instituto Superior Técnico, Av. Rovisco Pais, s/n. Lisboa, Portugal, and Makromolekulare Chemie, Bergische Universität Wuppertal, Gaussstr. 20, 42097 Wuppertal, Germany
| | - T. Bünnagel
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal, Departamento de Engenharia Química e Biológica, Centro de Química Estrutural, Instituto Superior Técnico, Av. Rovisco Pais, s/n. Lisboa, Portugal, and Makromolekulare Chemie, Bergische Universität Wuppertal, Gaussstr. 20, 42097 Wuppertal, Germany
| | - U. Scherf
- Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal, Departamento de Engenharia Química e Biológica, Centro de Química Estrutural, Instituto Superior Técnico, Av. Rovisco Pais, s/n. Lisboa, Portugal, and Makromolekulare Chemie, Bergische Universität Wuppertal, Gaussstr. 20, 42097 Wuppertal, Germany
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14
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Di Paolo RE, Burrows HD, Morgado J, Maçanita AL. Photodynamics of a PV Trimer in High-Viscosity Solvents and in PMMA Films: A New Insight into Energy Transfer versus Conformational Relaxation in Conjugated Polymers. Chemphyschem 2009; 10:448-54. [DOI: 10.1002/cphc.200800554] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Pina J, Seixas de Melo JS. A comprehensive investigation of the electronic spectral and photophysical properties of conjugated naphthalene–thiophene oligomers. Phys Chem Chem Phys 2009; 11:8706-13. [DOI: 10.1039/b909113k] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Gigante B, Esteves MA, Pires N, Davies ML, Douglas P, Fonseca SM, Burrows HD, Castro RAE, Pina J, Seixas de Melo J. Synthesis, spectroscopy, photophysics and thermal behaviour of stilbene-based triarylamines with dehydroabietic acid methyl ester moieties. NEW J CHEM 2009. [DOI: 10.1039/b815711a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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