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Conformer-dependent self-assembled metallacycles with photo-reversible response

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Abstract

Discrete, well-defined metallacycles and metallacages with stimuli-responsive behaviors have been largely predominated by the organic donor/metal acceptor paradigm with spontaneous formation of coordination bonds. However, light-driven self-assembly systems usually show relatively low utilization yield of photons and low fatigue resistance. Given that almost no example illustrates the different self-assembly behaviors of antiparallel and parallel conformers in the traditional photochromic diarylethene (DAE) system, here we have for the first time constructed a unique series of photoactive conformer-dependent metallacycles, focusing on the characterization and comparison of self-assembly behavior in different ligand conformers with different di-platinum(II) acceptors. Their photoswitchable scaffold sizes and shapes are precisely controlled by photochromically separable parallel or anti-parallel conformers via coordination-driven self-assembly. The ap-conformer and closed form provide larger bending angles upon coordination with di-Pt(II) acceptors into hexagon [6 + 6] or [3 + 3] while the p-conformer only can form smaller polygon cycles. Notably, in contrast with the non-photoactive parallel conformer, the reversible interconversion of anti-parallel ring-open and ring-closed conformer metallacycles can be achieved by alternate irradiation with UV and visible light, respectively, along with a relatively high conversion ratio and good fatigue resistance. This work provides a potential way to construct smart materials for use in sensing, catalysis and drug delivery systems.

Graphical abstract: Conformer-dependent self-assembled metallacycles with photo-reversible response

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Publication details

The article was received on 13 Feb 2019, accepted on 25 Mar 2019 and first published on 25 Mar 2019


Article type: Edge Article
DOI: 10.1039/C9SC00757A
Citation: Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Conformer-dependent self-assembled metallacycles with photo-reversible response

    M. Li, L. Chen, Z. Zhang, Q. Luo, H. Yang, H. Tian and W. Zhu, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C9SC00757A

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