251
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Breitenkamp RB, Tew GN. Aggregation of Poly(p-phenylene ethynylene)s Containing Nonpolar and Amine Side Chains. Macromolecules 2004. [DOI: 10.1021/ma0351017] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rebecca B. Breitenkamp
- Department of Polymer Science and Engineering, University of Massachusetts, 120 Governors Drive, Amherst, Massachusetts 01003
| | - Gregory N. Tew
- Department of Polymer Science and Engineering, University of Massachusetts, 120 Governors Drive, Amherst, Massachusetts 01003
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252
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Leroy-Lhez S, Parker A, Lapouyade P, Belin C, Ducasse L, Oberle J, Fages F. Tunable fluorescence emission in pyrene–(2,2′-bipyridine) dyads containing phenylene–ethynylene bridges. Photochem Photobiol Sci 2004; 3:949-59. [PMID: 15480486 DOI: 10.1039/b409250c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A synthetic route is described for the preparation of a series of pyrene-containing pi-conjugated 2,2'-bipyridine (bpy) ligands. These compounds have been investigated by steady-state and time-resolved fluorescence spectroscopy. They display intense visible absorption and fluorescence emission properties that can be very efficiently modulated by the complexation of zinc(ii) metal ions to the bpy coordinating unit. The solvatochromism of the emission band of the zinc(ii) complexes, the fluorescence quantum yields, and lifetimes in THF have been determined. Zinc(ii)-induced formation of a charge transfer singlet excited states induces an increase in dipole moment of more than 20 D. Semiempirical theoretical calculations were performed and allowed to assess the electronic nature of ground and excited states of the free ligands and and that of the corresponding zinc(ii) complexes.
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253
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Brizius G, Billingsley K, Smith MD, Bunz UHF. Conformational and Electronic Engineering of Twisted Diphenylacetylenes. Org Lett 2003; 5:3951-4. [PMID: 14535751 DOI: 10.1021/ol035532+] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[structure: see text] Three tethered diphenylacetylene derivatives were prepared by alkyne metathesis. In these cycles, the twist angle between the two benzene rings is variable and determined by the nature of the linker. The engineering of the twist angle leads to a change of the UV-vis spectra of the cycles. The larger the twist angle in the macrocycles, the more blue shifted their lambda(max) (UV-vis), the lower their fluorescence quantum yield, and the lower field shifted their (13)C NMR signals of the alkyne carbons are.
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Affiliation(s)
- Glen Brizius
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
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254
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Fukaminato T, Kawai T, Kobatake S, Irie M. Fluorescence of Photochromic 1,2-Bis(3-methyl-2-thienyl)ethene. J Phys Chem B 2003. [DOI: 10.1021/jp034624d] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tuyoshi Fukaminato
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan
| | - Tsuyoshi Kawai
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan
| | - Seiya Kobatake
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan
| | - Masahiro Irie
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan
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255
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Chu Q, Pang Y. Molecular Aggregation of Poly[(1,3-phenyleneethynylene)-alt-oligo(2,5-dialkoxy-1,4-phenyleneethynylene)]: Effects of Solvent, Temperature, and Polymer Conformation. Macromolecules 2003. [DOI: 10.1021/ma034449z] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qinghui Chu
- Department of Chemistry & Center for High Performance Polymers and Composites, Clark Atlanta University, Atlanta, Georgia 30314
| | - Yi Pang
- Department of Chemistry & Center for High Performance Polymers and Composites, Clark Atlanta University, Atlanta, Georgia 30314
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256
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Bouchard J, Belletête M, Durocher G, Leclerc M. Solvatochromic Properties of 2,7-Carbazole-Based Conjugated Polymers. Macromolecules 2003. [DOI: 10.1021/ma034098o] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jimmy Bouchard
- Canada Research Chair in Electroactive and Photoactive Polymers, Centre de recherche en sciences et ingénierie des macromolécules, Département de Chimie, Université Laval, Quebec City, Quebec, Canada G1K 7P4, and Département de Chimie, Université de Montréal, Montréal, Quebec, Canada H3C 3J7
| | - Michel Belletête
- Canada Research Chair in Electroactive and Photoactive Polymers, Centre de recherche en sciences et ingénierie des macromolécules, Département de Chimie, Université Laval, Quebec City, Quebec, Canada G1K 7P4, and Département de Chimie, Université de Montréal, Montréal, Quebec, Canada H3C 3J7
| | - Gilles Durocher
- Canada Research Chair in Electroactive and Photoactive Polymers, Centre de recherche en sciences et ingénierie des macromolécules, Département de Chimie, Université Laval, Quebec City, Quebec, Canada G1K 7P4, and Département de Chimie, Université de Montréal, Montréal, Quebec, Canada H3C 3J7
| | - Mario Leclerc
- Canada Research Chair in Electroactive and Photoactive Polymers, Centre de recherche en sciences et ingénierie des macromolécules, Département de Chimie, Université Laval, Quebec City, Quebec, Canada G1K 7P4, and Département de Chimie, Université de Montréal, Montréal, Quebec, Canada H3C 3J7
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257
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Hortholary C, Coudret C. An approach to long and unsubstituted molecular wires: synthesis of redox-active, cationic phenylethynyl oligomers designed for self-assembled monolayers. J Org Chem 2003; 68:2167-74. [PMID: 12636376 DOI: 10.1021/jo026735z] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Various oligo(phenyleneethynylene)s (OPEs) have been synthesized in the past, as they are considered as prototypes of molecular wires. When the oligomers are capped by a redox site at one end and a thiol at the other end, the resulting molecules can be grafted as a self-assembled monolayer on a gold electrode and fully studied by electrochemical techniques. Unfortunately, such molecules are usually poorly soluble and require the incorporation of solubilizing pendant groups. In this paper, we show that the replacement of the classically used redox group ferrocene by a cationic organometallic ruthenium complex, namely, [Ru(bipy)(2)(ppH)](+) (bipy, 2,2'-bipyridine; ppH, 2-(2'-yl-phenyl)pyridine), allows a concise synthesis of an unsubstituted thioacetate-capped OPE up to four repetitive units long. The positive charge does not interfere with the conventional organic chemistry used to elongate, purify, or characterize the hexafluorophosphate salts of the molecules. To our knowledge, this represents the first family of long, poorly substituted OPEs designed for self-assembly.
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Affiliation(s)
- Cédric Hortholary
- CEMES-CNRS, 29 rue Jeanne Marvig BP 4347, 31055 Toulouse Cedex 4, France
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258
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Pizzoferrato R, Berliocchi M, Di Carlo A, Lugli P, Venanzi M, Micozzi A, Ricci A, Lo Sterzo C. Improvement of the Extended One-Pot (EOP) Procedure To Form Poly(aryleneethynylene)s and Investigation of Their Electrical and Optical Properties. Macromolecules 2003. [DOI: 10.1021/ma0216829] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. Pizzoferrato
- INFM-Dipartimento di Ingegneria Meccanica and INFM-Dipartimento di Ingegneria Elettronica, Facoltà di Ingegneria, Università di Tor Vergata, Via di Tor Vergata 110, 00133 Roma, Italy, Dipartimento di Scienze e Tecnologie Chimiche, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy, Istituto C.N.R. di Chimica dei Composti Organometallici (ICCOM-CNR)-Sezione di Roma, Dipartimento di Chimica, Box 34-Roma 62, Universita' “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy, and
| | - M. Berliocchi
- INFM-Dipartimento di Ingegneria Meccanica and INFM-Dipartimento di Ingegneria Elettronica, Facoltà di Ingegneria, Università di Tor Vergata, Via di Tor Vergata 110, 00133 Roma, Italy, Dipartimento di Scienze e Tecnologie Chimiche, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy, Istituto C.N.R. di Chimica dei Composti Organometallici (ICCOM-CNR)-Sezione di Roma, Dipartimento di Chimica, Box 34-Roma 62, Universita' “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy, and
| | - A. Di Carlo
- INFM-Dipartimento di Ingegneria Meccanica and INFM-Dipartimento di Ingegneria Elettronica, Facoltà di Ingegneria, Università di Tor Vergata, Via di Tor Vergata 110, 00133 Roma, Italy, Dipartimento di Scienze e Tecnologie Chimiche, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy, Istituto C.N.R. di Chimica dei Composti Organometallici (ICCOM-CNR)-Sezione di Roma, Dipartimento di Chimica, Box 34-Roma 62, Universita' “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy, and
| | - P. Lugli
- INFM-Dipartimento di Ingegneria Meccanica and INFM-Dipartimento di Ingegneria Elettronica, Facoltà di Ingegneria, Università di Tor Vergata, Via di Tor Vergata 110, 00133 Roma, Italy, Dipartimento di Scienze e Tecnologie Chimiche, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy, Istituto C.N.R. di Chimica dei Composti Organometallici (ICCOM-CNR)-Sezione di Roma, Dipartimento di Chimica, Box 34-Roma 62, Universita' “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy, and
| | - M. Venanzi
- INFM-Dipartimento di Ingegneria Meccanica and INFM-Dipartimento di Ingegneria Elettronica, Facoltà di Ingegneria, Università di Tor Vergata, Via di Tor Vergata 110, 00133 Roma, Italy, Dipartimento di Scienze e Tecnologie Chimiche, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy, Istituto C.N.R. di Chimica dei Composti Organometallici (ICCOM-CNR)-Sezione di Roma, Dipartimento di Chimica, Box 34-Roma 62, Universita' “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy, and
| | - A. Micozzi
- INFM-Dipartimento di Ingegneria Meccanica and INFM-Dipartimento di Ingegneria Elettronica, Facoltà di Ingegneria, Università di Tor Vergata, Via di Tor Vergata 110, 00133 Roma, Italy, Dipartimento di Scienze e Tecnologie Chimiche, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy, Istituto C.N.R. di Chimica dei Composti Organometallici (ICCOM-CNR)-Sezione di Roma, Dipartimento di Chimica, Box 34-Roma 62, Universita' “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy, and
| | - A. Ricci
- INFM-Dipartimento di Ingegneria Meccanica and INFM-Dipartimento di Ingegneria Elettronica, Facoltà di Ingegneria, Università di Tor Vergata, Via di Tor Vergata 110, 00133 Roma, Italy, Dipartimento di Scienze e Tecnologie Chimiche, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy, Istituto C.N.R. di Chimica dei Composti Organometallici (ICCOM-CNR)-Sezione di Roma, Dipartimento di Chimica, Box 34-Roma 62, Universita' “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy, and
| | - C. Lo Sterzo
- INFM-Dipartimento di Ingegneria Meccanica and INFM-Dipartimento di Ingegneria Elettronica, Facoltà di Ingegneria, Università di Tor Vergata, Via di Tor Vergata 110, 00133 Roma, Italy, Dipartimento di Scienze e Tecnologie Chimiche, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy, Istituto C.N.R. di Chimica dei Composti Organometallici (ICCOM-CNR)-Sezione di Roma, Dipartimento di Chimica, Box 34-Roma 62, Universita' “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy, and
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259
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Garreau S, Leclerc M, Errien N, Louarn G. Planar-to-Nonplanar Conformational Transition in Thermochromic Polythiophenes: A Spectroscopic Study. Macromolecules 2003. [DOI: 10.1021/ma021358d] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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260
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Chao HY, Lu W, Li Y, Chan MCW, Che CM, Cheung KK, Zhu N. Organic triplet emissions of arylacetylide moieties harnessed through coordination to [Au(PCy(3))]+. Effect of molecular structure upon photoluminescent properties. J Am Chem Soc 2002; 124:14696-706. [PMID: 12465981 DOI: 10.1021/ja0209417] [Citation(s) in RCA: 165] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A family of mono- and binuclear Cy(3)P-supported gold(I) complexes containing various pi-conjugated linear arylacetylide ligands, including the two homologous series (Cy(3)P)Au(Ctbd1;CC(6)H(4))(n)()(-)(1)(Ctbd1;CPh) and (Cy(3)P)Au(Ctbd1;CC(6)H(4))(n)()Ctbd1;CAu(PCy(3)) (n = 1-4), have been prepared. X-ray crystal analyses revealed no intermolecular aurophilic interactions in their crystal lattice. The lowest-energy singlet transitions are predominately intraligand in nature and exhibit both phenyl and acetylenic (1)(pipi) character. Strong photoluminescence is detected in solid and solution states under ambient conditions, with lifetimes in the microsecond regime. For complexes with a single arylacetylide group, only phosphorescence from the arylacetylide (3)(pipi) state is observed. Vibrational spacings in the solid-state emission spectra can be attributed to a combination of phenyl ring deformation and symmetric phenyl ring and Ctbd1;C stretches. Additional delayed-fluorescence emission is recorded for complexes with multiple p-arylacetylide units, and this is attributed to a triplet-triplet annihilation process. The phosphorescence energy of these complexes are readily modified by altering the length of the conjugated arylacetylide system, while the intensity of phosphorescence relative to fluorescence decreases when the p-arylacetylide chain is elongated. Information regarding the nature and relative energies of arylacetylide singlet and triplet excited states has been derived from the two homologous series and extrapolated to polymeric arylacetylide species. The (3)(pipi) excited-state reduction potentials E degrees [Au(+)/Au] (Au = 1a, 2, and 4) are estimated to be -1.80, -1.28, and -1.17 V versus SSCE, respectively.
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Affiliation(s)
- Hsiu-Yi Chao
- Department of Chemistry and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China
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261
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An BK, Kwon SK, Jung SD, Park SY. Enhanced emission and its switching in fluorescent organic nanoparticles. J Am Chem Soc 2002; 124:14410-5. [PMID: 12452716 DOI: 10.1021/ja0269082] [Citation(s) in RCA: 1211] [Impact Index Per Article: 55.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new class of organic nanoparticles (CN-MBE nanoparticles) with a mean diameter of ca. 30-40 nm, which exhibit a strongly enhanced fluorescence emission, were prepared by a simple reprecipitation method. CN-MBE (1-cyano-trans-1,2-bis-(4'-methylbiphenyl)ethylene) is very weakly fluorescent in solution, but the intensity is increased by almost 700 times in the nanoparticles. Enhanced emission in CN-MBE nanoparticles is attributed to the synergetic effect of intramolecular planarization and J-type aggregate formation (restricted excimer formation) in nanopaticles. On/off fluorescence switching for organic vapor was demonstrated with CN-MBE nanoparticles.
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Affiliation(s)
- Byeong-Kwan An
- School of Materials Science & Engineering, Seoul National University, Seoul, 151-744, Korea
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262
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Kyrychenko A, Albinsson B. Conformer-dependent electronic coupling for long-range triplet energy transfer in donor-bridge-acceptor porphyrin dimers. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01558-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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263
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Bernier S, Garreau S, Béra-Abérem M, Gravel C, Leclerc M. A versatile approach to affinitychromic polythiophenes. J Am Chem Soc 2002; 124:12463-8. [PMID: 12381187 DOI: 10.1021/ja027387l] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The preparation of both postfunctionalizable and chromic poly[3-(N-succinimido-p-phenylcarboxylate(tetraethoxy)oxy)-4-methylthiophene] is reported. The N-hydroxysuccinimide ester side group can easily react with different amine-bearing molecules in the solid state to yield a library of new polythiophene derivatives. The resulting polymers can be dissolved in various solvents, and interactions between the side chains (ligands) and different analytes (targets) can be detected from modifications of both the side-chain and the backbone conformations resulting in important color changes (i.e., affinitychromism). This colorimetric polymeric transducer could therefore lead to highly valuable, versatile, and inexpensive tools for highthroughput screening and drug discovery.
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Affiliation(s)
- Stéphanie Bernier
- Canada Research Chair in Electroactive and Photoactive Polymers, Centre de recherche en sciences et ingénierie des macromolécules, Département de Chimie, Université Laval, Quebec City, Qc, Canada, G1K 7P4
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264
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Tirapattur S, Belletête M, Drolet N, Leclerc M, Durocher G. Spectral and Photophysical Properties of Fluorene-Based Polyesters in Solution and in the Solid State. Macromolecules 2002. [DOI: 10.1021/ma0209444] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Soujanya Tirapattur
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada; Chaire de recherche du Canada en polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolecules (CERSIM), Département de chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada; and Institute of Microstructural Sciences, National Research Council of Canada, M-50, Montreal Road, Ottawa, Ontario K1A
| | - Michel Belletête
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada; Chaire de recherche du Canada en polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolecules (CERSIM), Département de chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada; and Institute of Microstructural Sciences, National Research Council of Canada, M-50, Montreal Road, Ottawa, Ontario K1A
| | - Nicolas Drolet
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada; Chaire de recherche du Canada en polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolecules (CERSIM), Département de chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada; and Institute of Microstructural Sciences, National Research Council of Canada, M-50, Montreal Road, Ottawa, Ontario K1A
| | - Mario Leclerc
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada; Chaire de recherche du Canada en polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolecules (CERSIM), Département de chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada; and Institute of Microstructural Sciences, National Research Council of Canada, M-50, Montreal Road, Ottawa, Ontario K1A
| | - Gilles Durocher
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada; Chaire de recherche du Canada en polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolecules (CERSIM), Département de chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada; and Institute of Microstructural Sciences, National Research Council of Canada, M-50, Montreal Road, Ottawa, Ontario K1A
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265
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Tirapattur S, Belletête M, Drolet N, Bouchard J, Ranger M, Leclerc M, Durocher G. Spectroscopic Study of Intermolecular Interactions in Various Oligofluorenes: Precursors of Light-Emitting Polymers. J Phys Chem B 2002. [DOI: 10.1021/jp0143544] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Soujanya Tirapattur
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada, Chaire de recherche du Canada en chimie des polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolécules (CERSIM), Université Laval, Cité Universitaire, Québec, G1K 7P4, Canada, and Institute of Microstructural Sciences, National Research Council of Canada M-50, Montreal road, Ottawa, Ontario, K1A 0R6, Canada
| | - Michel Belletête
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada, Chaire de recherche du Canada en chimie des polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolécules (CERSIM), Université Laval, Cité Universitaire, Québec, G1K 7P4, Canada, and Institute of Microstructural Sciences, National Research Council of Canada M-50, Montreal road, Ottawa, Ontario, K1A 0R6, Canada
| | - Nicolas Drolet
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada, Chaire de recherche du Canada en chimie des polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolécules (CERSIM), Université Laval, Cité Universitaire, Québec, G1K 7P4, Canada, and Institute of Microstructural Sciences, National Research Council of Canada M-50, Montreal road, Ottawa, Ontario, K1A 0R6, Canada
| | - Jimmy Bouchard
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada, Chaire de recherche du Canada en chimie des polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolécules (CERSIM), Université Laval, Cité Universitaire, Québec, G1K 7P4, Canada, and Institute of Microstructural Sciences, National Research Council of Canada M-50, Montreal road, Ottawa, Ontario, K1A 0R6, Canada
| | - Maxime Ranger
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada, Chaire de recherche du Canada en chimie des polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolécules (CERSIM), Université Laval, Cité Universitaire, Québec, G1K 7P4, Canada, and Institute of Microstructural Sciences, National Research Council of Canada M-50, Montreal road, Ottawa, Ontario, K1A 0R6, Canada
| | - Mario Leclerc
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada, Chaire de recherche du Canada en chimie des polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolécules (CERSIM), Université Laval, Cité Universitaire, Québec, G1K 7P4, Canada, and Institute of Microstructural Sciences, National Research Council of Canada M-50, Montreal road, Ottawa, Ontario, K1A 0R6, Canada
| | - Gilles Durocher
- Laboratoire de photophysique moléculaire, Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada, Chaire de recherche du Canada en chimie des polymères photoactifs et électroactifs, Centre de recherche en sciences et ingénierie des macromolécules (CERSIM), Université Laval, Cité Universitaire, Québec, G1K 7P4, Canada, and Institute of Microstructural Sciences, National Research Council of Canada M-50, Montreal road, Ottawa, Ontario, K1A 0R6, Canada
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266
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Beeby A, Findlay K, Low PJ, Marder TB. A re-evaluation of the photophysical properties of 1,4-bis(phenylethynyl)benzene: a model for poly(phenyleneethynylene). J Am Chem Soc 2002; 124:8280-4. [PMID: 12105907 DOI: 10.1021/ja025568h] [Citation(s) in RCA: 135] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photophysical measurements, recorded in aerated cyclohexane at 283 K, indicate that 1,4-bis(phenylethynyl)benzene behaves in a conventional manner, undergoing emission from the lowest vibrational level of the first excited singlet state; there is no evidence for aggregation of this material in cyclohexane solution in the concentration range (1-250) x 10(-6) mol dm(-3). However, in highly viscous, low-temperature glasses, the material does exhibit inhomogeneous fluorescence behavior, and wavelength-dependent excitation and emission spectra, indicative of a slow rate of relaxation of conformers of the excited states compared to the rate of fluorescence.
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Affiliation(s)
- Andrew Beeby
- Department of Chemistry, University of Durham, Durham DH1 3LE, United Kingdom.
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267
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Kim J, Levitsky IA, McQuade DT, Swager TM. Structural control in thin layers of poly(p-phenyleneethynylene)s: photophysical studies of Langmuir and Langmuir-Blodgett films. J Am Chem Soc 2002; 124:7710-8. [PMID: 12083924 DOI: 10.1021/ja0200600] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present the relationship between the spatial arrangement and the photophysical properties of fluorescent polymers in thin films with controlled structures. Eight surfactant poly(p-phenyleneethynylene)s were designed and studied. These detailed studies of the behavior of the polymers at the air-water interface, and of the photophysical properties of their transferred LB films, revealed key structure-property relationships. Some of the polymers displayed pi-aggregates that are characteristic of an edge-on structure at the air-water interface. Monolayer LB films of these polymers showed greatly reduced quantum yields relative to solution values. Other polymers exhibited a highly emissive face-on structure at the air-water interface, and did not form pi-aggregates. The combination of pressure-area isotherms and the surface pressure dependent in situ UV-vis spectra of the polymers at the air-water interface revealed different behavioral details. In addition, the UV-vis spectra, fluorescence spectra, and quantum yields of the LB films provide design principles for making highly emissive films.
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Affiliation(s)
- Jinsang Kim
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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268
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Tsolakis PK, Kallitsis JK, Godt A. Synthesis of Luminescent Rod−Coil Block Copolymers Using Atom Transfer Radical Polymerization. Macromolecules 2002. [DOI: 10.1021/ma020256k] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- P. K. Tsolakis
- Department of Chemistry, University of Patras, GR-265 00 Patras, Greece, and Institute of Chemical Engineering and High-Temperature Chemical Processes (ICE/HT), P.O. Box 1414, GR-265 00 Patras, Greece
| | - J. K. Kallitsis
- Department of Chemistry, University of Patras, GR-265 00 Patras, Greece, and Institute of Chemical Engineering and High-Temperature Chemical Processes (ICE/HT), P.O. Box 1414, GR-265 00 Patras, Greece
| | - A. Godt
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
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269
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Kitamura C, Saito K, Nakagawa M, Ouchi M, Yoneda A, Yamashita Y. Synthesis and properties of a new ethyne-linked donor/acceptor pentamer. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00478-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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270
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Schmieder K, Levitus M, Dang H, Garcia-Garibay MA. Photophysical Properties of Coplanar and Twisted 1,4-Bis(9-ethynylanthracenyl)benzene. Rotational Equilibration in the Excited States of Diaryalkynes. J Phys Chem A 2002. [DOI: 10.1021/jp012775f] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kelli Schmieder
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569
| | - Marcia Levitus
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569
| | - Hung Dang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569
| | - Miguel A. Garcia-Garibay
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569
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271
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Dang H, Levitus M, Garcia-Garibay MA. One step Pd(0)-catalyzed synthesis, X-ray analysis, and photophysical properties of cyclopent[hi]aceanthrylene: fullerene-like properties in a nonalternant cyclopentafused aromatic hydrocarbon. J Am Chem Soc 2002; 124:136-43. [PMID: 11772070 DOI: 10.1021/ja016189b] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple procedure for the synthesis of cyclopentafused polycyclic aromatic hydrocarbons (CP-PAH) with Pd(PPh(3))(2)Cl(2) catalyst has been applied to the one-pot palladium(0)-catalyzed coupling of 9,10-dibromoanthracene (1) with 2-methyl-3-butyn-2-ol. Reactions carried out in refluxing benzene in the presence of CuSO(4)/Al(2)O(3) yielded 9,10-dialkynylanthracene 2a, alkynyl aceanthrylene 2b, and 2,7-disubstituted cyclopent[hi]aceanthrylene 2c in 13%, 23%, and 19% purified yields, respectively, with total conversions of 80-90%. Sealed tube reactions without copper at 110 degrees C improved the yield of 2c up to >75%. Single-crystal X-ray analyses of 2a and 2c reveal a three-dimensional hydrogen bonding network, producing a unique crystal packing. The packing structure of 2b is dominated by pi-pi stacking interactions between two aceanthrylene molecules. CP-PAHs 2b and 2c have potentially interesting fullerene-like photophysics. While the UV-vis and fluorescence spectra of 2a (Phi(F) = 0.87) show the characteristic vibronic structure of anthracene, the UV-vis spectra of ruby-red aceanthrylene 2b and greenish-black cyclopent[hi]aceanthrylene 2c extend well into the visible range. Isomers 2b and 2c showed no detectable fluorescence emission. Unlike fullerenes, compounds 2b and 2c are poor singlet oxygen sensitizers with measured (1)O(2) quantum yields of 0.02 and 0.06, respectively. As expected from a simple Hückel analysis, 2c has relatively low two-electron reduction potentials as determined by cyclic voltammetry.
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Affiliation(s)
- Hung Dang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, USA
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272
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Structure and optical properties of single crystal of fluorene–thiophene oligomers. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2002. [DOI: 10.1016/s0928-4931(01)00421-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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273
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Abstract
Alkyne metathesis was effected by mixtures of Mo(CO)(6) and phenols at elevated temperatures based on an improved version of the method reported by Mortreux and Mori. When propynylated arenes are subjected to these reaction conditions, the formation of diarylalkynes is often quantitative and likewise allows the synthesis of alkyne-bridged macrocycles and polymers of high molecular weight. Alkyne metathesis made high-molecular weight poly[p-(dialkylphenylene)ethynylene]s (PPEs) accessible that show promise as active layers in organic semiconductor devices.
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Affiliation(s)
- U H Bunz
- Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, South Carolina 29208, USA.
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274
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Sluch MI, Godt A, Bunz UH, Berg MA. Excited-state dynamics of oligo(p-phenyleneethynylene): quadratic coupling and torsional motions. J Am Chem Soc 2001; 123:6447-8. [PMID: 11427084 DOI: 10.1021/ja0159012] [Citation(s) in RCA: 157] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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