Easy separation of Δ and Λ isomers of highly luminescent [Ir(III)]-cyclometalated complexes based on chiral phenol-oxazoline ancillary ligands.

Authors :: Marchi E
Sinisi R
Bergamini G
Tragni M
Monari M
Bandini M
Ceroni P
Source :: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2012 Jul 09; Vol. 18 (28), pp. 8765-73. Date of Electronic Publication: 2012 Jun 11.
Publication Year :: 2012
Abstract: A new class of neutral cyclometalated iridium(III) complexes with enantiomerically pure C(1)-symmetric phenol-oxazolines (3a,b) have been synthetized in high yields and fully characterized. Resolution of the corresponding Δ(R) and Λ(R) or Δ(S) and Λ(S) isomers was easily achieved by conventional flash chromatography. The corresponding Δ and Λ helicities have been confirmed by CD spectroscopy and X-ray crystallography. Regarding the absorption and luminescence properties with unpolarized light, no significant difference between Δ and Λ isomers has been observed. A strong blue luminescence is observed for deaerated solutions of complexes 5a and 5b in CH(3)CN.<br /> (Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

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