Diastereoselective formation of chiral tris-cyclometalated iridium (III) complexes: characterization and photophysical properties.
Chiral, facial tris-cyclometalated Ir(III) complexes, fac-Delta-Ir(pppy)(3), fac-Lambda-Ir(pppy)(3), fac-Lambda-IrL (where pppy is (8R,10R)-2-(2'-phenyl)-4,5-pinenopyridine and L is a tripodal ligand comprising three pppy moieties connected through a mesityl spacer) have been synthesized and characterized. In IrL, NMR and CD studies indicate that only one diastereomer is formed, with the Lambda configuration at the metal center, whereas enantiopure pppy yields the fac-Lambda- and the fac-Delta-stereoisomer in a ratio 2:3. fac-Lambda-IrL was structurally characterized using X-ray crystallography. The luminescence properties including CPL, of the three complexes and their sensitivity to dioxygen were examined.
Schaffner-Hamann
Christine
C
Department of Chemistry, University of Fribourg, Pérolles, CH-1700 Fribourg, Switzerland.
von Zelewsky
Alexander
A
Barbieri
Andrea
A
Barigelletti
Francesco
F
Muller
Gilles
G
Riehl
James P
JP
Neels
Antonia
A