151
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Jäckel F, De Feyter S, Hofkens J, Köhn F, De Schryver F, Ego C, Grimsdale A, Müllen K. Conformational characterization from modulated single molecule fluorescence intensity traces. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01133-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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152
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Imai M, Arai T. Synthesis and photochemical properties of polyphenylene dendrimers with photoreactive stilbene core. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01063-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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153
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Köhn F, Hofkens J, Gronheid R, Van der Auweraer M, De Schryver FC. Parameters Influencing the On- and Off-Times in the Fluorescence Intensity Traces of Single Cyanine Dye Molecules. J Phys Chem A 2002. [DOI: 10.1021/jp012959u] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fabian Köhn
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - Johan Hofkens
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - Roel Gronheid
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - Mark Van der Auweraer
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
| | - Frans C. De Schryver
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium
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154
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Gronheid R, Hofkens J, Köhn F, Weil T, Reuther E, Müllen K, De Schryver FC. Intramolecular Förster energy transfer in a dendritic system at the single molecule level. J Am Chem Soc 2002; 124:2418-9. [PMID: 11890773 DOI: 10.1021/ja017442a] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photophysics of a dendrimer containing four donor chromophores and one acceptor chromophore are studied at the single-molecule level. Upon excitation of the donors exclusive acceptor emission is observed due to efficient Förster energy transfer. For 70% of the molecules donor emission is observed after bleaching of the acceptor, leading to a reduction of the Förster energy transfer efficiency. Furthermore, we demonstrate that in this molecular system the donor chromophores do not bleach by a triplet-sensitized photooxidation.
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Affiliation(s)
- Roel Gronheid
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
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155
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Vosch T, Hofkens J, Cotlet M, Köhn F, Fujiwara H, Gronheid R, Van Der Biest K, Weil T, Herrmann A, Müllen K, Mukamel S, Van Der Auweraer M, De Schryver FC. Influence of Structural and Rotational Isomerism on the Triplet Blinking of Individual Dendrimer Molecules J.H. thanks the FWO for a post-doctoral fellowship. T.V. wishes to thank the I.W.T. for a doctoral fellowship. Financial support by the FWO, the DWTC (through IUAP-4-11), and the Flemish Ministry of Education (through GOA/1/2001) is gratefully acknowledged. The EC (through TMR Sisitomas), ESF (through Smarton), and the Volkswagen-Stiftung are also thanked for financial support. Dr. L. Latterini is thanked for the triplet absorption measurements. Angew Chem Int Ed Engl 2001; 40:4643-4648. [PMID: 12404372 DOI: 10.1002/1521-3773(20011217)40:24<4643::aid-anie4643>3.0.co;2-n] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tom Vosch
- Department of Chemistry Katholieke Universiteit Leuven Celestijnenlaan 200F, 3001 Heverlee (Belgium)
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156
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Vosch T, Hofkens J, Cotlet M, Köhn F, Fujiwara H, Gronheid R, Van Der Biest K, Weil T, Herrmann A, Müllen K, Mukamel S, Van der Auweraer M, De Schryver FC. Influence of Structural and Rotational Isomerism on the Triplet Blinking of Individual Dendrimer Molecules. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20011217)113:24<4779::aid-ange4779>3.0.co;2-o] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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157
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Vosch T, Hofkens J, Cotlet M, Köhn F, Fujiwara H, Gronheid R, Van Der Biest K, Weil T, Herrmann A, Müllen K, Mukamel S, Van der Auweraer M, De Schryver FC. Influence of Structural and Rotational Isomerism on the Triplet Blinking of Individual Dendrimer Molecules. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3773(20011217)40:24%3c4643::aid-anie4643%3e3.0.co;2-n] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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158
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Garcia-Parajo MF, Koopman M, van Dijk EM, Subramaniam V, van Hulst NF. The nature of fluorescence emission in the red fluorescent protein DsRed, revealed by single-molecule detection. Proc Natl Acad Sci U S A 2001; 98:14392-7. [PMID: 11724943 PMCID: PMC64692 DOI: 10.1073/pnas.251525598] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Recent studies on the newly cloned red fluorescence protein DsRed from the Discosoma genus have shown its tremendous advantages: bright red fluorescence and high resistance against photobleaching. However, it has also become clear that the protein forms closely packed tetramers, and there is indication for incomplete protein maturation with unknown proportion of immature green species. We have applied single-molecule methodology to elucidate the nature of the fluorescence emission in the DsRed. Real-time fluorescence trajectories have been acquired with polarization sensitive detection. Our results indicate that energy transfer between identical monomers occurs efficiently with red emission arising equally likely from any of the chromophoric units. Photodissociation of one of the chromophores weakly quenches the emission of adjacent ones. Dual color excitation (at 488 and 568 nm) single-molecule microscopy has been performed to reveal the number and distribution of red vs. green species within each tetramer. We find that 86% of the DsRed contain at least one green species with a red-to-green ratio of 1.2-1.5. On the basis of our findings, oligomer suppression would not only be advantageous for protein fusion but will also increase the fluorescence emission of individual monomers.
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Affiliation(s)
- M F Garcia-Parajo
- Applied Optics Group, Department of Applied Physics and MESA(+) Research Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
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159
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De Belder G, Jordens S, Lor M, Schweitzer G, De R, Weil T, Herrmann A, Wiesler U, Müllen K, De Schryver F. Femtosecond fluorescence upconversion study of rigid dendrimers containing peryleneimide chromophores at the rim. J Photochem Photobiol A Chem 2001. [DOI: 10.1016/s1010-6030(01)00569-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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160
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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
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161
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Köhn F, Hofkens J, Wiesler UM, Cotlet M, van der Auweraer M, Müllen K, De Schryver FC. Single-molecule spectroscopy of a dendrimer-based host-guest system. Chemistry 2001; 7:4126-33. [PMID: 11686590 DOI: 10.1002/1521-3765(20011001)7:19<4126::aid-chem4126>3.0.co;2-m] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We report on a single-molecule study of a host-guest system that consists of a second-generation polyphenylene dendrimer and the cyanine dye Pinacyanol. The use of single-molecule spectroscopy enables us to obtain more detailed information on the properties of the host-guest system and can be used to confirm solution data. At low dye to dendrimer ratios the system is present as a one-to-one complex, while for higher ratios an ion-pair system is formed. Changes in the spectral properties of the single molecules are explained by differences in local polarisability. The difference of the triplet lifetimes of single free dye molecules and of associated ones is interpreted as deriving from a larger free volume for the dye molecules in the dendritic host relative to the rigid polymer matrix.
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Affiliation(s)
- F Köhn
- Department of Chemistry, Katholieke Universiteit Leuven, Belgium
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162
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Carnahan MA, Grinstaff MW. Synthesis and Characterization of Poly(glycerol−succinic acid) Dendrimers. Macromolecules 2001. [DOI: 10.1021/ma010848n] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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163
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Hofkens J, Schroeyers W, Loos D, Cotlet M, Köhn F, Vosch T, Maus M, Herrmann A, Müllen K, Gensch T, De Schryver FC. Triplet states as non-radiative traps in multichromophoric entities: single molecule spectroscopy of an artificial and natural antenna system. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2001; 57:2093-2107. [PMID: 11603833 DOI: 10.1016/s1386-1425(01)00499-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Energy transfer in antenna systems, ordered arrays of chromophores, is one of the key steps in the photosynthetic process. The photophysical processes taking place in such multichromophoric systems, even at the single molecule level, are complicated and not yet fully understood. Instead of directly studying individual antenna systems, we have chosen to focus first on systems for which the amount of chromophores and the interactions among the chromophores can be varied in a systematic way. Dendrimers with a controlled number of chromophores at the rim fulfill those requirements perfectly. A detailed photophysical study of a second-generation dendrimer, containing eight peryleneimide chromophores at the rim, was performed 'J. Am. Chem. Soc., 122 (2000) 9278'. One of the most intriguing findings was the presence of collective on/off jumps in the fluorescence intensity traces of the dendrimers. This phenomenon can be explained by assuming a simultaneous presence of both a radiative trap (energetically lowest chromophoric site) and a non-radiative trap (triplet state of one chromophore) within one individual dendrimer. It was shown that an analogue scheme could explain the collective on/off jumps in the fluorescence intensity traces of the photosynthetic pigment B-phycoerythrin (B-PE) (Porphyridium cruentum). The different values of the triplet lifetime that could be recovered for a fluorescence intensity trace of B-PE were correlated with different intensity levels in the trace, suggesting different chromophores acting as a trap as function of time.
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Affiliation(s)
- J Hofkens
- Department of Organic Chemistry, Katholieke Universiteit Leuven, Belgium.
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164
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Tinnefeld P, Müller C, Sauer M. Time-varying photon probability distribution of individual molecules at room temperature. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00883-1] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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165
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Weil T, Wiesler UM, Herrmann A, Bauer R, Hofkens J, De Schryver FC, Müllen K. Polyphenylene dendrimers with different fluorescent chromophores asymmetrically distributed at the periphery. J Am Chem Soc 2001; 123:8101-8. [PMID: 11506567 DOI: 10.1021/ja010579g] [Citation(s) in RCA: 136] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new synthetic approach leading to asymmetrically substituted polyphenylene dendrimers is presented. Following this method, polyphenylene dendrimers decorated with an increasing number of chromophores at the periphery have been obtained up to the second generation. Especially the synthesis of a polyphenylene dendrimer bearing three donor chromophores and one acceptor chromophore has been realized. Intramolecular energy transfer within this molecule is demonstrated by applying absorption and fluorescence measurements.
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Affiliation(s)
- T Weil
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
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166
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Maus M, De R, Lor M, Weil T, Mitra S, Wiesler UM, Herrmann A, Hofkens J, Vosch T, Müllen K, De Schryver FC. Intramolecular energy hopping and energy trapping in polyphenylene dendrimers with multiple peryleneimide donor chromophores and a terryleneimide acceptor trap chromophore. J Am Chem Soc 2001; 123:7668-76. [PMID: 11480989 DOI: 10.1021/ja010570e] [Citation(s) in RCA: 120] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Intramolecular Förster-type excitation energy transfer (FRET) processes in a series of first-generation polyphenylene dendrimers substituted with spatially well-separated peryleneimide chromophores and a terryleneimide energy-trapping chromophore at the rim were investigated by steady-state and time-resolved fluorescence spectroscopy. Energy-hopping processes among the peryleneimide chromophores are revealed by anisotropy decay times of 50--80 ps consistent with a FRET rate constant of k(hopp) = 4.6 ns(-1). If a terryleneimide chromophore is present at the rim of the dendrimer together with three peryleneimide chromophores, more than 95% of the energy harvested by the peryleneimide chromophores is transferred and trapped in the terryleneimide. The two decay times (tau(1) = 52 ps and tau(2) = 175 ps) found for the peryleneimide emission band are recovered as rise times at the terryleneimide emission band proving that the energy trapping of peryleneimide excitation energy by the terryleneimide acceptor occurs via two different, efficient pathways. Molecular- modeling-based structures tentatively indicate that the rotation of the terryleneimide acceptor group can lead to a much smaller distance to a single donor chromophore, which could explain the occurrence of two energy-trapping rate constants. All energy-transfer processes are quantitatively describable with Förster energy transfer theory, and the influence of the dipole orientation factor in the Förster equation is discussed.
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Affiliation(s)
- M Maus
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
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167
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Blum C, Stracke F, Becker S, Müllen K, Meixner AJ. Discrimination and Interpretation of Spectral Phenomena by Room-Temperature Single-Molecule Spectroscopy. J Phys Chem A 2001. [DOI: 10.1021/jp0031092] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christian Blum
- Physikalische Chemie, Universität Siegen, 57068 Siegen, Germany, and Max Planck Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | - Frank Stracke
- Physikalische Chemie, Universität Siegen, 57068 Siegen, Germany, and Max Planck Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | - Stefan Becker
- Physikalische Chemie, Universität Siegen, 57068 Siegen, Germany, and Max Planck Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | - Klaus Müllen
- Physikalische Chemie, Universität Siegen, 57068 Siegen, Germany, and Max Planck Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | - Alfred J. Meixner
- Physikalische Chemie, Universität Siegen, 57068 Siegen, Germany, and Max Planck Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
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168
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Watson MD, Fechtenkötter A, Müllen K. Big is beautiful--"aromaticity" revisited from the viewpoint of macromolecular and supramolecular benzene chemistry. Chem Rev 2001; 101:1267-300. [PMID: 11710221 DOI: 10.1021/cr990322p] [Citation(s) in RCA: 1038] [Impact Index Per Article: 45.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M D Watson
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, D-55128 Mainz, Germany
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169
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Maus M, Cotlet M, Hofkens J, Gensch T, De Schryver FC, Schaffer J, Seidel CA. An Experimental Comparison of the Maximum Likelihood Estimation and Nonlinear Least-Squares Fluorescence Lifetime Analysis of Single Molecules. Anal Chem 2001; 73:2078-86. [PMID: 11354494 DOI: 10.1021/ac000877g] [Citation(s) in RCA: 150] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two procedures based on the weighted least-squares (LS) and the maximum likelihood estimation (MLE) method to confidently analyze single-molecule (SM) fluorescence decays with a total number (N) of 2,500-60,000 counts have been elucidated and experimentally compared by analyzing measured bulk and SM decays. The key observation of this comparison is that the LS systematically underestimates the fluorescence lifetimes by approximately 5%, for the range of 1,000-20,000 events, whereas the MLE method gives stable results over the whole intensity range, even at counts N less than 1,000, where the LS analysis delivers unreasonable values. This difference can be attributed to the different statistics approaches and results from improper weighting of the LS method. As expected from theory, the results of both methods become equivalent above a certain threshold of N detected photons per decay, which is here experimentally determined to be approximately 20,000. In contrast to the bulk lifetime distributions, the SM fluorescence lifetime distributions exhibit standard deviations that are sizably larger than the statistically expected values. This comparison proves the strong influence of the inhomogenuous microenvironment on the photophysical behavior of single molecules embedded in a 10-30-nm thin polymer layer.
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Affiliation(s)
- M Maus
- Department of Chemistry, Katholieke Universiteit Leuven, Belgium
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170
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Maus M, Mitra S, Lor M, Hofkens J, Weil T, Herrmann A, Müllen K, De Schryver FC. Intramolecular Energy Hopping in Polyphenylene Dendrimers with an Increasing Number of Peryleneimide Chromophores. J Phys Chem A 2001. [DOI: 10.1021/jp003643+] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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171
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Cotlet M, Hofkens J, Köhn F, Michiels J, Dirix G, Van Guyse M, Vanderleyden J, De Schryver FC. Collective effects in individual oligomers of the red fluorescent coral protein DsRed. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00165-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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172
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Gensch T, Hofkens J, Köhn F, Vosch T, Herrmann A, Müllen K, De Schryver F. Polarisation Sensitive Single Molecule Fluorescence Detection with Linear Polarised Excitation Light and Modulated Polarisation Direction Applied to Multichromophoric Entities. ACTA ACUST UNITED AC 2001. [DOI: 10.1002/1438-5171(200103)2:1<35::aid-simo35>3.0.co;2-l] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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173
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De Belder G, Schweitzer G, Jordens S, Lor M, Mitra S, Hofkens J, De Feyter S, Van der Auweraer M, Herrmann A, Weil T, Müllen K, De Schryver FC. Singlet-Singlet Annihilation in Multichromophoric Peryleneimide Dendrimers, Determined by Fluorescence Upconversion. Chemphyschem 2001; 2:49-55. [DOI: 10.1002/1439-7641(20010119)2:1<49::aid-cphc49>3.0.co;2-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2000] [Indexed: 11/10/2022]
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174
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Zhu A, Bharathi P, Drickamer HG, Moore JS. Effect of pressure on the luminescence of a series of methoxy phenylacetylene dendrimers neat and in dilute solution in solid poly(tert-butyl methacrylate). ACTA ACUST UNITED AC 2001. [DOI: 10.1002/pola.1265] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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175
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