CuII-selective bispidine-dye conjugates
The substitution of tetradentate bispidine ligands with rhodamine and cyanine dye molecules, coupled to an amine donor, forming an amide as potential fifth donor, is described. Bispidines are known to lead to very stable CuII complexes, and the coordination to CuII was expected to efficiently quench...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
22 May 2015
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| In: |
Journal of inorganic biochemistry
Year: 2015, Volume: 148, Pages: 78-83 |
| ISSN: | 1873-3344 |
| DOI: | 10.1016/j.jinorgbio.2015.05.009 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.jinorgbio.2015.05.009 Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S0162013415001385 
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| Author Notes: | Dominik Brox, Peter Comba, Dirk-Peter Herten, Esther Kimmle, Michael Morgen, Carmen L. Rühl, Arina Rybina, Holger Stephan, Golo Storch, Hubert Wadepohl |
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| 520 | |a The substitution of tetradentate bispidine ligands with rhodamine and cyanine dye molecules, coupled to an amine donor, forming an amide as potential fifth donor, is described. Bispidines are known to lead to very stable CuII complexes, and the coordination to CuII was expected to efficiently quench the fluorescence of dye molecules. However, at physiological pH the amide is not coordinated, as shown by titration experiments and crystallographic structural data of three possible isomers of these complexes. This may be due to the specific cavity shape of bispidines and the Jahn-Teller lability of the CuII center. While CuII coordination in aqueous solution leads to efficient fluorescence quenching, experiments show that the complex stabilities are not large enough for CuII sensing in biological media, and possibilities are discussed, how this may be achieved by optimized bispidine-dye conjugates. | ||
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| 650 | 4 | |a Copper selectivity | |
| 650 | 4 | |a Fluorescence quenching | |
| 650 | 4 | |a Fluorescence sensor | |
| 650 | 4 | |a Jahn-Teller distortion | |
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