Ready Access to Anhydrous Anionic Lanthanide Acetates by Using Imidazolium Acetate Ionic Liquids as the Reaction Medium |
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Authors: | Dr. Guillaume Bousrez Olivier Renier Dr. Steven P. Kelley Brando Adranno Elnaz Tahavori Hatem M. Titi Dr. Volodymyr Smetana Prof. Dr. Si-Fu Tang Prof. Anja-Verena Mudring Prof. Dr. Robin D. Rogers |
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Affiliation: | 1. Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16 C, Stockholm, 10691 Sweden;2. Department of Chemistry, University of Missouri, 601, S. College Avenue, Columbia, MO, 65211 USA;3. Department of Chemistry, McGill University, Montreal, QC H3A 0B8 Canada;4. College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Changcheng Road 700, Chengyang District, Qingdao, 266109 P. R. China |
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Abstract: | Access to lanthanide acetate coordination compounds is challenged by the tendency of lanthanides to coordinate water and the plethora of acetate coordination modes. A straightforward, reproducible synthetic procedure by treating lanthanide chloride hydrates with defined ratios of the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) has been developed. This reaction pathway leads to two isostructural crystalline anhydrous coordination complexes, the polymeric [C2mim]n[{Ln2(OAc)7}n] and the dimeric [C2mim]2[Ln2(OAc)8], based on the ion size and the ratio of IL used. A reaction with an IL : Ln-salt ratio of 5 : 1, where Ln=Nd, Sm, and Gd, led exclusively to the polymer, whilst for the heaviest lanthanides (Dy−Lu) the dimer was observed. Reaction with Eu and Tb resulted in a mixture of both polymeric and dimeric forms. When the amount of IL and/or the size of the cation was increased, the reaction led to only the dimeric compound for all the lanthanide series. Crystallographic analyses of the resulting salts revealed three different types of metal-acetate coordination modes where η2μκ2 is the most represented in both structure types. |
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Keywords: | anhydrous lanthanide complexes dimers ethylmethylimidazolium acetate polymers |
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