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Influence of metal coordination and light irradiation on hierarchical self-assembly processes

Kartha, KK, Allampally, NK, Politi, AT, Prabhu, DD, Ouchi, H, Albuquerque, RQ, Yagai, S and Fernández, G (2018) Influence of metal coordination and light irradiation on hierarchical self-assembly processes. Chemical Science, 10 (3). pp. 752-760. ISSN 2041-6520

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Abstract

Smart light-responsive supramolecular materials have been extensively investigated in the past decade, but so far the impact of metal coordination on hierarchical supramolecular structures of light-responsive building blocks has remained nearly unexplored. Herein, we unravel the hierarchical self-assembly of a small π-conjugated azo-containing pyridyl ligand that is able to respond to UV-light and metal complexation. The ligand self-assembles in an antiparallel fashion into long twisted fibers, which are then disassembled upon photoisomerization of the azobenzene groups, resulting in shorter rigid rods with a different packing motif. Complexation of Pd(ii) ions enhances the cooperativity of the aggregation and induces a molecular rearrangement into slipped stacks with subsequent formation of long thin fibers. These are then transformed into thinner, shorter rods upon light irradiation. The observed different light-responsiveness, besides clearing up the influence of metal coordination and light irradiation in self-assembly processes, paves the way towards the design of novel supramolecular photochromic systems. © 2019 The Royal Society of Chemistry.

Item Type: Article
Subjects: Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
Divisions: Pharmacy & Biomolecular Sciences
Publisher: Royal Society of Chemistry
Date Deposited: 22 Mar 2019 12:14
Last Modified: 22 Mar 2019 12:16
DOI or Identification number: 10.1039/c8sc03875a
URI: http://researchonline.ljmu.ac.uk/id/eprint/10385

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