Oldknow, S orcid.org/0000-0002-7506-0062, Rota Martir, D, Pritchard, VE orcid.org/0000-0001-5270-4534 et al. (4 more authors) (2018) Structure-switching M₃L₂ Ir(III) coordination cages with photo-isomerising azo-aromatic linkers. Chemical Science. pp. 8150-8159. ISSN 2041-6520
Abstract
Cyclotriguaiacylene has been functionalised with 3- or 4-pyridyl-azo-phenyl groups to form a series of molecular hosts with three azobenzene-type groups that exhibit reversible photo-isomerisation. Reaction of the host molecules with [Ir(C^N)₂(NCMe)₂]+ where C^N is the cyclometallating 2-phenylpyridinato, 2-(4-methylphenyl)pyridinato or 2-(4,5,6-trifluorophenyl)pyridinato results in the self-assembly of a family of five different [{Ir(C^N)₂}₃(L)₂]³+ coordination cages. Photo-irradiation of each of the cages with a high energy laser results in E → Z photo-isomerisation of the pyridyl-azo-phenyl groups with up to 40% of groups isomerising. Isomerisation can be reversed by exposure to blue light. Thus, the cages show reversible structure-switching while maintaining their compositional integrity. This represents the largest photo-induced structural change yet reported for a structurally-integral component of a coordination cage. Energy minimised molecular models indicate a switched cage has a smaller internal space than the initial all-E isomer. The [Ir(C^N)₂(NCMe)₂]+ cages are weakly emissive, each with a deep blue luminescence at ca. 450 nm.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2018, The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. To view a copy of this license, visit https://creativecommons.org/licenses/by/3.0/. |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Inorganic Chemistry (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 07 Sep 2018 14:10 |
Last Modified: | 17 Dec 2024 09:46 |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Identification Number: | 10.1039/C8SC03499K |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135379 |