Chiral transcription in self-assembled tetrahedral Eu4L6 chiral cages displaying sizable circularly polarized luminescence

Chi-Tung Yeung, King-Him Yim, Ho-Yin Wong, Robert Pal, Wai-Sum Lo, Siu-Cheong Yan, Melody Yee-Man Wong, Dmitry Yufit, Danil E. Smiles, Laura J. McCormick, Simon J. Teat, David K. Shuh, Wing-Tak Wong () and Ga-Lai Law ()
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Chi-Tung Yeung: The Hong Kong Polytechnic University
King-Him Yim: The Hong Kong Polytechnic University
Ho-Yin Wong: The Hong Kong Polytechnic University
Robert Pal: Durham University
Wai-Sum Lo: The Hong Kong Polytechnic University
Siu-Cheong Yan: The Hong Kong Polytechnic University
Melody Yee-Man Wong: The Hong Kong Polytechnic University
Dmitry Yufit: Durham University
Danil E. Smiles: Lawrence Berkeley National Laboratory
Laura J. McCormick: Lawrence Berkeley National Laboratory
Simon J. Teat: Lawrence Berkeley National Laboratory
David K. Shuh: Lawrence Berkeley National Laboratory
Wing-Tak Wong: The Hong Kong Polytechnic University
Ga-Lai Law: The Hong Kong Polytechnic University

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Predictable stereoselective formation of supramolecular assembly is generally believed to be an important but complicated process. Here, we show that point chirality of a ligand decisively influences its supramolecular assembly behavior. We designed three closely related chiral ligands with different point chiralities, and observe their self-assembly into europium (Eu) tetrametallic tetrahedral cages. One ligand exhibits a highly diastereoselective assembly into homochiral (either ΔΔΔΔ or ΛΛΛΛ) Eu tetrahedral cages whereas the two other ligands, with two different approaches of loosened point chirality, lead to a significant breakdown of the diastereoselectivity to generate a mixture of (ΔΔΔΔ and ΛΛΛΛ) isomers. The cages are highly emissive (luminescence quantum yields of 16(1) to 18(1)%) and exhibit impressive circularly polarized luminescence properties (|g lum|: up to 0.16). With in-depth studies, we present an example that correlates the nonlinear enhancement of the chiroptical response to the nonlinearity dependence on point chirality.

Date: 2017
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DOI: 10.1038/s41467-017-01025-1

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