Towards Photoswitchable Quadruple Hydrogen Bonds a Reversible "photolocking" Strategy for Photocontrolled Self-assembly

Overview

Journal Chem Sci

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2021 Jun 24

PMID 34163937

Citations 3

Authors

Lu Wei

Shi-Tao Han

Ting-Ting Jin

Tian-Guang Zhan

Li-Juan Liu

Jiecheng Cui

Kang-Da Zhang

Affiliations

Soon will be listed here.

Abstract

Developing new photoswitchable noncovalent interaction motifs with controllable bonding affinity is crucial for the construction of photoresponsive supramolecular systems and materials. Here we describe a unique "photolocking" strategy for realizing photoswitchable control of quadruple hydrogen-bonding interactions on the basis of modifying the ureidopyrimidinone (UPy) module with an -ester substituted azobenzene unit as the "photo-lock". Upon light irradiation, the obtained motif is capable of unlocking/locking the partial H-bonding sites of the UPy unit, leading to photoswitching between homo- and heteroquadruple hydrogen-bonded dimers, which has been further applied for the fabrication of novel tunable hydrogen bonded supramolecular systems. This "photolocking" strategy appears to be broadly applicable in the rational design and construction of other H-bonding motifs with sufficiently photoswitchable noncovalent interactions.

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