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Fluorescence quenching in Zn2+-bis-terpyridine coordination polymers: a single molecule study

Siebert, Ronald; Tian, Yuxi LU ; Camacho Dejay, Rafael LU ; Winter, Andreas; Wild, Andreas; Krieg, Andreas; Schubert, Ulrich S.; Popp, Juergen; Scheblykin, Ivan LU and Dietzek, Benjamin (2012) In Journal of Materials Chemistry 22(31). p.16041-16050
Abstract
A Zn2+-bis-terpyridine coordination polymer is investigated by single-molecule fluorescence spectroscopy (SMS). The bis-terpyridine ligands of the coordination polymers bear conjugated chromophores connecting the terpyridine spheres of the ligands, which resemble structural features of MEH-PPV. To the best of our knowledge this paper presents the first systematic SMS study on Zn2+-bis-terpyridine coordination polymers. Upon incorporation of free chromophores into the polymer, the fluorescence quantum yield of individual chromophores appears to be reduced. The reason for the reduced emission per chromophore in a polymer is investigated by brightness studies on single isolated polymer molecules. Furthermore, the experiments reveal that the... (More)
A Zn2+-bis-terpyridine coordination polymer is investigated by single-molecule fluorescence spectroscopy (SMS). The bis-terpyridine ligands of the coordination polymers bear conjugated chromophores connecting the terpyridine spheres of the ligands, which resemble structural features of MEH-PPV. To the best of our knowledge this paper presents the first systematic SMS study on Zn2+-bis-terpyridine coordination polymers. Upon incorporation of free chromophores into the polymer, the fluorescence quantum yield of individual chromophores appears to be reduced. The reason for the reduced emission per chromophore in a polymer is investigated by brightness studies on single isolated polymer molecules. Furthermore, the experiments reveal that the Zn2+-bis-terpyridine coordination polymer contains a significantly larger fraction of effective chromophores, compared to one of the most common conjugated polymers, e. g., MEH-PPV. This finding is attributed to the particularly rigid geometry of the system at hand, which was corroborated by polarization-dependent experiments. Time-resolved experiments identified two different types of intensity fluctuations: small amplitude intensity fluctuations might correlate with switching of individual chromophores by structural fluctuations, while large amplitude jumps switch off the emission of the entire molecule. Finally, experiments under different atmospheric conditions offer further insights into the molecular mechanism and the nature of the quenchers involved in the blinking. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Materials Chemistry
volume
22
issue
31
pages
16041 - 16050
publisher
Royal Society of Chemistry
external identifiers
  • wos:000306479600077
  • scopus:84863903200
ISSN
1364-5501
DOI
10.1039/c2jm31237a
language
English
LU publication?
yes
id
327c56f3-ad53-4e89-968d-efe556dd4c4b (old id 2991515)
date added to LUP
2012-08-22 15:01:28
date last changed
2017-07-09 03:07:09
@article{327c56f3-ad53-4e89-968d-efe556dd4c4b,
  abstract     = {A Zn2+-bis-terpyridine coordination polymer is investigated by single-molecule fluorescence spectroscopy (SMS). The bis-terpyridine ligands of the coordination polymers bear conjugated chromophores connecting the terpyridine spheres of the ligands, which resemble structural features of MEH-PPV. To the best of our knowledge this paper presents the first systematic SMS study on Zn2+-bis-terpyridine coordination polymers. Upon incorporation of free chromophores into the polymer, the fluorescence quantum yield of individual chromophores appears to be reduced. The reason for the reduced emission per chromophore in a polymer is investigated by brightness studies on single isolated polymer molecules. Furthermore, the experiments reveal that the Zn2+-bis-terpyridine coordination polymer contains a significantly larger fraction of effective chromophores, compared to one of the most common conjugated polymers, e. g., MEH-PPV. This finding is attributed to the particularly rigid geometry of the system at hand, which was corroborated by polarization-dependent experiments. Time-resolved experiments identified two different types of intensity fluctuations: small amplitude intensity fluctuations might correlate with switching of individual chromophores by structural fluctuations, while large amplitude jumps switch off the emission of the entire molecule. Finally, experiments under different atmospheric conditions offer further insights into the molecular mechanism and the nature of the quenchers involved in the blinking.},
  author       = {Siebert, Ronald and Tian, Yuxi and Camacho Dejay, Rafael and Winter, Andreas and Wild, Andreas and Krieg, Andreas and Schubert, Ulrich S. and Popp, Juergen and Scheblykin, Ivan and Dietzek, Benjamin},
  issn         = {1364-5501},
  language     = {eng},
  number       = {31},
  pages        = {16041--16050},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of Materials Chemistry},
  title        = {Fluorescence quenching in Zn2+-bis-terpyridine coordination polymers: a single molecule study},
  url          = {http://dx.doi.org/10.1039/c2jm31237a},
  volume       = {22},
  year         = {2012},
}