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Issue 35, 2016
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Photoswitchable azobenzene-appended iridium(III) complexes

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Iridium(III) cyclometalated complexes have been used as models to study the effect that extended conjugation and substitution pattern has on the photochromic behavior of azobenzene-appended 2-phenylpyridyl (ppy) ligands. For this purpose four azobenzene-containing ppy ligands were synthesized. With these ligands, nine iridium(III) complexes containing up to three appended azobenzenes were synthesized. Analysis of their photochromic behaviour by means of UV-vis and 1H-NMR spectroscopy permitted us to conclude that the light-induced trans-to-cis isomerization of the azobenzene was strongly inhibited upon coordination to the Ir(III) cation when the electronic conjugation was extended along the whole ligand. The use of an aliphatic spacer unit (either –CH2– or –OCH2–) between the azobenzene and the ppy fragment of the ligand sufficed to disrupt the electronic communication, and obtain photochromic organometallic complexes.

Graphical abstract: Photoswitchable azobenzene-appended iridium(iii) complexes

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Publication details

The article was received on 09 May 2016, accepted on 18 Jul 2016 and first published on 19 Jul 2016

Article type: Paper
DOI: 10.1039/C6DT01817C
Citation: Dalton Trans., 2016,45, 13726-13741
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    Photoswitchable azobenzene-appended iridium(III) complexes

    J. Pérez-Miqueo, A. Altube, E. García-Lecina, A. Tron, N. D. McClenaghan and Z. Freixa, Dalton Trans., 2016, 45, 13726
    DOI: 10.1039/C6DT01817C

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