SCHEDULED MAINTENANCE
Helicenic N-heterocyclic carbene copper(i) complex displaying circularly polarized blue fluorescence†
Dominika
Kaczmarczyk, 
b
Samuel
Del Fré,
‡b
Ludovic
Favereau,
a
Elsa
Caytan,
a
Nicolas
Vanthuyne,
c
J. A. Gareth
Williams,
d
Monika
Srebro-Hooper
*b
and
Jeanne
Crassous
*a
b
Samuel
Del Fré,
‡b
Ludovic
Favereau,
a
Elsa
Caytan,
a
Nicolas
Vanthuyne,
c
J. A. Gareth
Williams,
d
Monika
Srebro-Hooper
*b
and
Jeanne
Crassous
*a
Abstract
Enantiopure copper(I) chloride complexes bearing a monodentate N-(carbo[6]helicenyl)–NHC ligand have been prepared and characterized experimentally and computationally. Their high stability enables the stereochemistry to be probed by X-ray crystallography and NMR spectroscopy. The resolved enantiomeric complexes emit circularly polarized blue fluorescence with glum ∼1.3 × 10−3 in solution. The photophysical and chiroptical properties of these systems, with their helicene-centred origin, are similar to those of the organic helicene-benzimidazole precursor proligand, although the reverse axial chirality configuration is preferentially observed for the complex compared to the ligand.
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