Light-Induced Contraction/Expansion of 1D Photoswitchable Metallopolymer Monitored at the Solid–Liquid Interface
El Garah M, Borre E, Ciesielski A, Dianat A, Gutierrez R, Cuniberti G, Bellemin-Laponnaz S, Mauro M, Samori P (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 13
Article Number: 1701790
Journal Issue: 40
Abstract
The use of a bottom-up approach to the fabrication of nanopatterned functional surfaces, which are capable to respond to external stimuli, is of great current interest. Herein, the preparation of light-responsive, linear supramolecular metallopolymers constituted by the ideally infinite repetition of a ditopic ligand bearing an azoaryl moiety and Co(II) coordination nodes is described. The supramolecular polymerization process is followed by optical spectroscopy in dimethylformamide solution. Noteworthy, a submolecularly resolved scanning tunneling microscopy (STM) study of the in situ reversible trans-to-cis photoisomerization of a photoswitchable metallopolymer that self-assembles into 2D crystalline patterns onto a highly oriented pyrolytic graphite surface is achieved for the first time. The STM analysis of the nanopatterned surfaces is corroborated by modeling the physisorbed species onto a graphene slab before and after irradiation by means of density functional theory calculation. Significantly, switching of the monolayers consisting of supramolecular Co(II) metallopolymer bearing trans-azoaryl units to a novel pattern based on cis isomers can be triggered by UV light and reversed back to the trans conformer by using visible light, thereby restoring the trans-based supramolecular 2D packing. These findings represent a step forward toward the design and preparation of photoresponsive “smart” surfaces organized with an atomic precision.
Involved external institutions
France (FR)
Germany (DE)How to cite
APA:
El Garah, M., Borre, E., Ciesielski, A., Dianat, A., Gutierrez, R., Cuniberti, G.,... Samori, P. (2017). Light-Induced Contraction/Expansion of 1D Photoswitchable Metallopolymer Monitored at the Solid–Liquid Interface. Small, 13(40). https://doi.org/10.1002/smll.201701790
MLA:
El Garah, Mohamed, et al. "Light-Induced Contraction/Expansion of 1D Photoswitchable Metallopolymer Monitored at the Solid–Liquid Interface." Small 13.40 (2017).
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