A reversibly photoswitchable mononuclear palladium(ii) complex with ortho-diethylated azobenzene ligands
- 20 September 2010
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in New Journal of Chemistry
- Vol. 34 (12), 2887-2891
- https://doi.org/10.1039/c0nj00345j
Abstract
A mononuclear palladium(II) complex (PdCl2(2Et-Azo)2), with sterically bulky ortho-diethylated azobenzenes (2Et-Azo) in the long-lived cis form, was designed to achieve reversible photoswitching originating from a reversible change in its molecular structure. An X-ray crystallographic study indicated that the metal center in the complex has a trans square-planar structure, with two 2Et-Azo ligands coordinated to a palladium ion in a monodentate manner. Alternating UV and visible light irradiation of PdCl2(2Et-Azo)2 gave rise to reversible changes in the molecular structure between the trans and cis forms, confirmed by UV-vis absorption and NMR spectroscopic measurements. Neither significant decomposition nor fast dissociation of PdCl2(2Et-Azo)2 was observed by UV and visible light irradiation. Furthermore, slow thermal back-isomerization occurred over the course of 2 days at ambient temperature, which may be closely related to the stability of the cis form of the ortho-alkylated azobenzene ligand.Keywords
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