Jump to main content
Jump to site search


Coordination-modulated piezochromism in metal–viologen materials

Author affiliations

Abstract

While stimuli-responsive chromic phenomena are well known for various viologen-containing organic and metal–organic materials, viologen-based piezochromism is a very recent discovery in organic compounds. Here we present the first piezochromic metal–viologen material and the modulation of the pressure-responsive behavior through coordination structures. By means of ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, in situ/ex situ X-ray diffraction and DFT calculations, we demonstrated that a zigzag-chain CdII coordination polymer (1) with a viologen-dicarboxylate zwitterionic ligand shows reversible piezochromism, with modulations in threshold pressure and visible-light absorption (color) compared with the free ligand. We also illustrated that piezochromism can be suppressed upon coordination of the same ligand in a rigid 3D framework with the same metal ion. Two basic requirements were proposed from viologen-based piezochromism: appropriate donor–acceptor contacts providing electron transfer pathways, and structural flexibility allowing pressure to further reduce the contacts. We expect great prospects in tuning piezochromism and designing new pressure-responsive materials through diverse metal–viologen combinations. The very fast photochromic response of compound 1 at ambient pressure was also studied, which was attributed to the rather short donor–acceptor contacts in the structure.

Graphical abstract: Coordination-modulated piezochromism in metal–viologen materials

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Sep 2017, accepted on 31 Oct 2017 and first published on 31 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC04208F
Citation: J. Mater. Chem. C, 2017, Advance Article
  •   Request permissions

    Coordination-modulated piezochromism in metal–viologen materials

    Q. Sui, Y. Yuan, N. Yang, X. Li, T. Gong, E. Gao and L. Wang, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC04208F

Search articles by author

Spotlight

Advertisements