Structure of [C10H10N2][La(SO4)2] 3 2H2O, (I).
The asymmetric unit of I consists of 18 non-hydrogen atoms.
It has one crystallographically independent La3þ ion, two sulfate groups,half a molecule of protonated bipyridine molecule, and a lattice water molecule (Supporting Information, Figure S10).
The half bipyridine unit is related to the other half through the C-C bond, which lies on the center of symmetry.
The La3þ ions are surrounded by nine sulfate oxygens forming a LaO9 polyhedra, with a distorted tricapped trigonal prismatic coordination environment (Supporting Information, Figure S11).
The oxygen atoms O(3), O(5), and O(6) were found to be three coordinated, binding two La atoms and one S atom.
The La-O bond distances are in the range of 2.474(2)-2.624(2) Å (av. 2.563 Å).
The O-La-O bond angles are in the range 53.59(6)- 160.11(6). The selected bond distances are given in Table 3