Protonation behaviour of chiral tetradentate polypyridines derived from α-Pinene
- Düggeli, Mathias Department of Chemistry, University of Fribourg, Fribourg, Switzerland
- Christen, Tobias Department of Chemistry, University of Fribourg, Fribourg, Switzerland
- Zelewsky, Alexander von Department of Chemistry, University of Fribourg, Fribourg, Switzerland
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11.11.2004
Published in:
- Chemistry - A European Journal. - 2005, vol. 11, p. 185-194
English
Detailed protonation experiments of the [5,6]-pinenebipyridine molecule and the unsubstituted [4,5]- and [5,6]-CHIRAGEN[0] ligands in various solvents indicate a variety of structures of the protonated species. UV-visible and NMR measurements (including ¹⁵N chemical shifts) show the transition from trans to cis conformation of [5,6]-pinenebipyridine upon protonation. The [4,5]-CHIRAGEN[0] ligand, in which the protonation sites of the nitrogen atom donors are at opposite sides of the molecule, behave essentially like two independent bipyridine moieties; this behaviour was monitored by UV-visible, CD and NMR spectroscopy (including ¹⁵N data). In the case of the [5,6]-CHIRAGEN[0], a pocket of donor atoms provides a chiral environment for two protons per ligand.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Chimie
- Language
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- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
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- RERO DOC 4878
- DOI 10.1002/chem.200400295
- Persistent URL
- https://folia.unifr.ch/unifr/documents/299733
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