Hydrogen-Bonded Superstructures of a Small Host Molecule and Lanthanide Aquo Ions

Despite containing only relatively small molecular components, the
structure of [Eu(H2O)9]1.5(CTV)6(CH3CN)5.5(H2O)7.5[Co(C2B9H11)2]4.5
(C191H337.5B81Co4.5Eu1.5N5.5O57, a = 54.590(2) Å, b = 37.5788(17) Å, c = 31.8067(14) Å, β = 116.573(2)°, monoclinic, C2/c, Z
= 8) is of an unusually large size and level of complexity, with an
intricate hydrogen-bonding network formed between lanthanide
aquo ions, water, and the small host molecule cyclotriveratrylene
(=CTV). The 3D hydrogen-bonded network structure that results
is unique and too complicated to apply the usual topological
analysis. Instead a simplified model using structural subunits is
described.