Abstract
An asymmetric 'Pacman' metalloligand, [Zn(PXT)], which features a cofacial ZnII -porphyrin unit (P) covalently attached to a terpyridine (T) chelating group via a rigid xanthene (X) moiety has been prepared, and its interactions with several different trivalent LnIII cations (NdIII , GdIII , YbIII and LuIII ) have been examined. The formation of 1:1 metal-ligand complexes was monitored by 1 H NMR spectroscopy and corroborated by HRMS data. Solution-stability constants were determined by UV/Vis titration, and the resulting complexes with NdIII or YbIII demonstrated sensitised emission in the NIR region due to energy transfer from the ZnII -porphyrin donor to LnIII acceptor. The energy transfer was investigated by transient absorption techniques, which provided insight into the kinetics and efficiency of the antenna effect.
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