Metal-Controlled Diastereoselective
Self-Assembly
and Circularly Polarized Luminescence of a Chiral Heptanuclear Europium
Wheel
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Abstract
The chiral dissymmetric tetradentate ligand (<i>S</i>)-6′-(4-phenyloxazolin-2-yl)-2,2′-bipyridine-6-carboxylate
(S-Phbipox) leads to the diastereoselective assembly of a homochiral
Eu<sup>3+</sup> triangle and a highly emissive (quantum yield = 27%)
heptanuclear wheel that is the largest example of a chiral luminescent
complex of Eu<sup>3+</sup> reported to date. The nuclearity of the
assembly is controlled by the solvent and the Eu<sup>3+</sup> cation.
All of the compounds show large circularly polarized luminescence
with an activity that varies with the nature of the assembly (highest
for the homochiral trimer)