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De Mitri N, Prampolini G, Monti S, Barone V. Structural, dynamic and photophysical properties of a fluorescent dye incorporated in an amorphous hydrophobic polymer bundle. Phys Chem Chem Phys 2014; 16:16573-87. [PMID: 24988373 PMCID: PMC4618303 DOI: 10.1039/c4cp01828a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The properties of a low molecular weight organic dye, namely 4-naphthyloxy-1-methoxy-2,2,6,6-tetramethylpiperidine, covalently bound to an apolar polyolefin were investigated by means of a multi-level approach, combining classical molecular dynamics simulations, based on purposely parameterized force fields, and quantum mechanical calculations based on density functional theory (DFT) and its time-dependent extension (TD-DFT). The structure and dynamics of the dye in its embedding medium were analyzed and discussed taking the entangling effect of the surrounding polymer into account, and also by comparing the results to those obtained for a different environment, i.e. toluene solution. Finally, the influence was investigated of long lived cages found in the polymeric embedding on photophysical properties, in terms of the slow and fast dye's internal dynamics, by comparing computed IR and UV spectra with their experimental counterparts.
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Affiliation(s)
- N De Mitri
- Scuola Normale Superiore, piazza dei Cavalieri 7, I-56126 Pisa, Italy
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Dong RY, Fodor-Csorba K, Xu J, Domenici V, Prampolini G, Veracini CA. Deuterium and Carbon-13 NMR Study of a Banana Mesogen: Molecular Structure and Order. J Phys Chem B 2004. [DOI: 10.1021/jp0498264] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ronald Y. Dong
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, Canada R3T 2N2, Department of Physics and Astronomy, Brandon University, Brandon, MB, Canada R7A 6A9, Research Institute of Solid State Physics and Optics, Budapest, Konkoly Thege u. 29-33, Hungary, and Departimento di Chemica e Chimica Industriale, Universita di Pisa, Via Risorgimento 35, 56126, Italy
| | - K. Fodor-Csorba
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, Canada R3T 2N2, Department of Physics and Astronomy, Brandon University, Brandon, MB, Canada R7A 6A9, Research Institute of Solid State Physics and Optics, Budapest, Konkoly Thege u. 29-33, Hungary, and Departimento di Chemica e Chimica Industriale, Universita di Pisa, Via Risorgimento 35, 56126, Italy
| | - J. Xu
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, Canada R3T 2N2, Department of Physics and Astronomy, Brandon University, Brandon, MB, Canada R7A 6A9, Research Institute of Solid State Physics and Optics, Budapest, Konkoly Thege u. 29-33, Hungary, and Departimento di Chemica e Chimica Industriale, Universita di Pisa, Via Risorgimento 35, 56126, Italy
| | - V. Domenici
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, Canada R3T 2N2, Department of Physics and Astronomy, Brandon University, Brandon, MB, Canada R7A 6A9, Research Institute of Solid State Physics and Optics, Budapest, Konkoly Thege u. 29-33, Hungary, and Departimento di Chemica e Chimica Industriale, Universita di Pisa, Via Risorgimento 35, 56126, Italy
| | - G. Prampolini
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, Canada R3T 2N2, Department of Physics and Astronomy, Brandon University, Brandon, MB, Canada R7A 6A9, Research Institute of Solid State Physics and Optics, Budapest, Konkoly Thege u. 29-33, Hungary, and Departimento di Chemica e Chimica Industriale, Universita di Pisa, Via Risorgimento 35, 56126, Italy
| | - C. A. Veracini
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, Canada R3T 2N2, Department of Physics and Astronomy, Brandon University, Brandon, MB, Canada R7A 6A9, Research Institute of Solid State Physics and Optics, Budapest, Konkoly Thege u. 29-33, Hungary, and Departimento di Chemica e Chimica Industriale, Universita di Pisa, Via Risorgimento 35, 56126, Italy
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Cacelli I, Cinacchi G, Prampolini G, Tani A. Modeling benzene with single-site potentials fromab initiocalculations: A step toward hybrid models of complex molecules. J Chem Phys 2004; 120:3648-56. [PMID: 15268527 DOI: 10.1063/1.1642594] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Extensive ab initio calculations at the MP2/6-31G* level have been carried out to sample the energy surface for the interactions of the benzene dimers. This database has been used to parameterize two anisotropic single-site models, meant to be used as building blocks in hybrid models of complex, liquid crystal forming molecules. A quadrupolar Gay-Berne (GBQIII) and an S-function (SF) Corner potentials have been obtained in this way. Their ability to reproduce, qualitatively at least, the phase diagram as well as energetic and structural properties of benzene has been tested with Monte Carlo simulations and compared with previous literature potentials, GBQI [S. Gupta et al., Mol. Phys. 65, 961 (1988)] and GBQII [T. R. Walsh, Mol. Phys. 100, 2867 (2002)]. It turned out that GBQI showed no melting transition in the temperature range explored (100-400 K), while GBQII underwent a phase transition from solid to gas, with no liquid phase. Conversely, both models parameterized on our database of ab initio interaction energies (GBQIII and SF) gave rise to a stable liquid phase. Melting has been observed between 100 and 150 K (GBQIII) and in the range 300-350 K (SF), i.e., substantially below and slightly above the experimental value at ambient pressure, 278 K. The description of the crystal structure of benzene at atmospheric pressure is also in better agreement with experimental data if the SF model is used, while positional correlations in the liquid are better described by the GBQIII potential. The S-function potential is also computationally more convenient. These results could be useful in the semirealistic modeling of more complex molecules.
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Affiliation(s)
- I Cacelli
- Dipartimento di Chimica e Chimica Industriale, Universita' di Pisa, Via Risorgimento 35, I-56126, Italy.
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