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Easy Separation of Δ and Λ Isomers of Highly Luminescent [Ir III ]‐Cyclometalated Complexes Based on Chiral Phenol‐Oxazoline Ancillary Ligands
Author(s) -
Marchi Enrico,
Sinisi Riccardo,
Bergamini Giacomo,
Tragni Michele,
Monari Magda,
Bandini Marco,
Ceroni Paola
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201200709
Subject(s) - oxazoline , phenol , chemistry , luminescence , combinatorial chemistry , organic chemistry , materials science , optoelectronics , catalysis
A new class of neutral cyclometalated iridium(III) complexes with enantiomerically pure C 1 ‐symmetric phenol‐oxazolines ( 3 a,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 5 a and 5 b in CH 3 CN.