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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Yeung CT,Yim KH,Wong HY,Pal R,Lo WS,Yan SC,Yee-Man Wong M,Yufit D,Smiles DE,McCormick LJ,Teat SJ,Shuh DK,Wong WT,Law GL

doi

10.1038/s41467-017-01025-1

subject

Has Abstract

pub_date

2017-10-24 00:00:00

pages

1128

issue

1

issn

2041-1723

pii

10.1038/s41467-017-01025-1

journal_volume

8

pub_type

杂志文章

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