Homochiral Self-Sorted and Emissive Ir III Metallo-Cryptophanes

The racemic ligands (±)-tris(isonicotinoyl)-cyclotriguaiacylene (L1), or (±)-tris(4-pyridyl-methyl)-cyclotriguaiacylene (L2) assemble with racemic (Λ,Δ)-[Ir(ppy) (MeCN) ] , in which ppy=2-phenylpyridinato, to form [{Ir(ppy) } (L) ] metallo-cryptophane cages. The crystal structure of [{Ir(ppy) } (L1)...

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Bibliographic Details
Published in:Chemistry : a European journal 2017-05, Vol.23 (26), p.6290-6294
Main Authors: Pritchard, Victoria E, Rota Martir, Diego, Oldknow, Samuel, Kai, Shumpei, Hiraoka, Shuichi, Cookson, Nikki J, Zysman-Colman, Eli, Hardie, Michaele J
Format: Article
Language:English
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Summary:The racemic ligands (±)-tris(isonicotinoyl)-cyclotriguaiacylene (L1), or (±)-tris(4-pyridyl-methyl)-cyclotriguaiacylene (L2) assemble with racemic (Λ,Δ)-[Ir(ppy) (MeCN) ] , in which ppy=2-phenylpyridinato, to form [{Ir(ppy) } (L) ] metallo-cryptophane cages. The crystal structure of [{Ir(ppy) } (L1) ]⋅3BF has MM-ΛΛΛ and PP-ΔΔΔ isomers, and homochiral self-sorting occurs in solution, a process accelerated by a chiral guest. Self-recognition between L1 and L2 within cages does not occur, and cages show very slow ligand exchange. Both cages are phosphorescent, with [{Ir(ppy) } (L2) ] having enhanced and blue-shifted emission when compared with [{Ir(ppy) } (L1) ] .
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201701348