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Protonation behaviour of chiral tetradentate polypyridines derived from α-Pinene

Düggeli, Mathias ; Christen, Tobias ; Zelewsky, Alexander von

In: Chemistry - A European Journal, 2005, vol. 11, p. 185-194

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...