Lanthanoid complexes supported by retro-Claisen condensation products of β-triketonates
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β-Triketonates have been recently used as chelating ligands for lanthanoid ions, presenting unique structures varying from polynuclear assemblies to polymers. In an effort to overcome low solubility of the complexes of tribenzoylmethane, four β-triketones with higher lipophilicity were synthesised. Complexation reactions were performed for each of these molecules using different alkaline bases in alcoholic media. X-ray diffraction studies suggested that the ligands were undergoing decomposition under the reaction conditions. This is proposed to be caused by in situ retro-Claisen condensation reactions, consistent with two examples that have been reported previously. The lability of the lanthanoid cations in the presence of a varying set of potential ligands gave rise to structures where one, two, or three of the molecules involved in the retro-Claisen condensation reaction were linked to the lanthanoid centres. These results, along with measurements of ligand decomposition in the presence of base alone, suggest that using solvents of lower polarity will mimimise the impact of the retro-Claisen condensation in these complexes.
Galan , L , Sobolev , A , Zysman-Colman , E , Ogden , M & Massi , M 2018 , ' Lanthanoid complexes supported by retro-Claisen condensation products of β -triketonates ' , Dalton Transactions , vol. In press . https://doi.org/10.1039/C8DT03585G
© 2018 Authors. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1039/C8DT03585G
DescriptionThis research was partially supportedby the Australian Research Council's Discovery Projects funding scheme (project DP17010189), and a Royal Society International Exchanges Grant. EZ-C thanks EPSRC (EP/M02105X/1) for support. L.A.G thanks Curtin University for the postgraduate scholarship.
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