Crystal structures of [M(NTf2)3(H2O)n] (M = Eu and Yb) and a template effect of linear molecules on the 3D hydrogen bonding network structure of [Eu(NTf2)3(H2O)3] |
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| Authors: | Masato Kawamura |
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| Affiliation: | National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan |
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| Abstract: | Lewis acid catalysts [Eu(NTf2)3] and [Yb(NTf2)3] can be easily crystallized from a p-xylene solution in the presence of carboxylic acids and a small amount of water to give a trihydrate and a pentahydrate, respectively. In the crystallization of [Eu(NTf2)3(H2O)3], linear molecules such as n-alkanes and n-alkanoic acids act as templates to form crystals belonging to the trigonal space group  with a hexagonal cylindrical structure, which is constructed by 3D hydrogen bonding network. On the other hand, [Eu(NTf2)3(H2O)3] crystallized in the cubic space group P213 in the presence of a bulkier carboxylic acid, cyclohexanecarboxylic acid. In both [Eu(NTf2)3(H2O)3] crystals,  ligands act as bidentate ligands coordinating to the Eu atom through two oxygen atoms. [Yb(NTf2)3] crystallized as a pentahydrate in the monoclinic space group P21/n, in which  ligands coordinated to the Yb atom with only one oxygen atom. |
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| Keywords: | Europium Ytterbium X-ray crystal structures Hydrogen bonding network Bis(trifluoromethanesulfonyl)amide complex |
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