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Liu B, Perrier S. Thermoresponsive micelles from well-defined block copolymers synthesized via reversible addition-fragmentation chain transfer polymerization. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pola.20785] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Geisser B, Ponce A, Alsfasser R. pH-Dependent Excited-State Dynamics of [Ru(bpy)(3)](2+)-Modified Amino Acids: Effects of an Amide Linkage and Remote Functional Groups. Inorg Chem 1999; 38:2030-2037. [PMID: 11670982 DOI: 10.1021/ic980896x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The pH-dependent photophysical properties of a series of polypyridyl ruthenium-substituted amino acids were investigated by steady-state and time-resolved luminescence spectroscopy. [H(3)N-DAPA(Rub(2)m)-OH](PF(6))(3) (1), [H(3)N-DABA(Rub(2)m)-OH](PF(6))(3) (2), [H(3)N-Orn(Rub(2)m)-OH](PF(6))(3) (3), and [H(3)N-Lys(Rub(2)m)-OH](PF(6))(3) (4) were obtained by formation of an amide link between the omega-NH(2) group of the respective commercially available amino acid and [Rub(2)(m-OH)](2+) (b = bipyridine, m-OH = 4'-methyl-2,2'-bipyridine-4-carboxylic acid). Due to the absence of significant electronic interactions between the ruthenium chromophore and the amino acid moieties, the energetics and extinction coefficients of the absorption spectra of 1-4 do not change as a function of pH. The luminescence intensities of these complexes, however, show a marked dependence on pH. At low pH (<2), quenching via excited-state protonation of the amide link leads to short lifetimes. In the pH 2-8 range, the lifetimes depend on the amino acid side chain length of the complex. At high pH (>9), lifetimes are approaching that of [Ru(bpy)(3)](2+), suggesting that the amino acid moiety has a negligible effect on nonadiabatic pathways in the excited-state decay of the ruthenium moiety. Our results are discussed with respect to the rapidly growing interest in ruthenium-substituted amino acids as spectroscopic and mechanistic tools in biological systems.
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Affiliation(s)
- Bernd Geisser
- Institute for Inorganic Chemistry, University of Erlangen-Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany, and Beckman Institute, California Institute of Technology, Pasadena, California 91125
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Hammarström L, Norrby T, Stenhagen G, Mårtensson J, Åkermark B, Almgren M. Two-Dimensional Emission Quenching and Charge Separation Using a Ru(II)-Photosensitizer Assembled with Membrane-Bound Acceptors. J Phys Chem B 1997. [DOI: 10.1021/jp9710805] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leif Hammarström
- Department of Physical Chemistry, Uppsala University, Box 532, S-751 21 Uppsala, Sweden; Department of Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden; and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Thomas Norrby
- Department of Physical Chemistry, Uppsala University, Box 532, S-751 21 Uppsala, Sweden; Department of Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden; and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Gunnar Stenhagen
- Department of Physical Chemistry, Uppsala University, Box 532, S-751 21 Uppsala, Sweden; Department of Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden; and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Jerker Mårtensson
- Department of Physical Chemistry, Uppsala University, Box 532, S-751 21 Uppsala, Sweden; Department of Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden; and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Björn Åkermark
- Department of Physical Chemistry, Uppsala University, Box 532, S-751 21 Uppsala, Sweden; Department of Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden; and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - Mats Almgren
- Department of Physical Chemistry, Uppsala University, Box 532, S-751 21 Uppsala, Sweden; Department of Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden; and Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden
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Chachaty C, Ahlnäs T, Lindström B, Nery H, Tistchenko A. NMR studies on micellar solutions of pyridinium octylhydrogen phosphate. J Colloid Interface Sci 1988. [DOI: 10.1016/0021-9797(88)90375-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Terech P, Chachaty C, Gaillard J, Giroud-Godquin A. Electron paramagnetic resonance study of the physical gelation of a copper complex in cyclohexane. ACTA ACUST UNITED AC 1987. [DOI: 10.1051/jphys:01987004804066300] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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