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Issue 20, 2020
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A light triggered optical and chiroptical switch based on a homochiral Eu2L3 helicate

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Abstract

Optical and chiroptical photoswitches have found potential applications in advanced information technologies. Herein, a pair of chiral triple-stranded helicates [Eu2(o-LRR)3](TOf)6 and [Eu2(o-LSS)3](TOf)6, which have chirality, luminescence and light stimuli-responsive properties, have been designed and synthesized. The ligands o-LRR/SS are composed of photochromic diarylethene moieties as spacers and two chiral 2,6-dipicolinic amides as coordination units. Through the comprehensive spectral characteristics in combination with semiempirical geometry optimization using the Sparkle/RM1 model, it was confirmed that (R/S)-1-phenylethanamines decorated at the terminals of ligands successfully controlled the stereoselective self-assembly of the helicates. Upon alternating UV and visible light irradiation, the diarylethene experienced a reversible change between a colorless open-ring state and a pink closed-ring state. This photochromic process caused variations in the electronic structure and ligand conformation, and led to the presence of light-responsive optical (UV and PL) and chiroptical (ECD and CPL) switching properties. The helicate may, therefore, be considered as a completely reversible +/− ECD and on/off CPL switch. Furthermore, on the basis of these light-switchable optical properties, the INHIBIT and IMPLICATION logic gates were fabricated.

Graphical abstract: A light triggered optical and chiroptical switch based on a homochiral Eu2L3 helicate

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Supplementary files

Article information


Submitted
29 Feb 2020
Accepted
11 Apr 2020
First published
13 Apr 2020

J. Mater. Chem. C, 2020,8, 6788-6796
Article type
Paper

A light triggered optical and chiroptical switch based on a homochiral Eu2L3 helicate

J. Zhang, Y. Zhou, Y. Yao, Z. Cheng, T. Gao, H. Li and P. Yan, J. Mater. Chem. C, 2020, 8, 6788
DOI: 10.1039/D0TC01044H

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