Complexation of trivalent lanthanide cations by inositols in the solid state: crystal structure and an FT-IR study of PrCl3·myo-inositol·9 H2O Original Research Article

The title compound, PrCl3·C6H12O6·9 H2O crystallized in the monoclinic space group P21/n with cell dimensions a=15.8293(3), b=8.67750(10), c=16.2292(3) Å, β=107.0788(8)°, V=2130.92(6) Å3 and Z=4. Each Pr ion is coordinated to nine oxygen atoms, two from the inositol and seven from water molecules, with Pr–O distances from 2.4729 to 2.6899 Å; the other two water molecules are hydrogen-bonded. No direct contacts exist between Pr and Cl. There is an extensive network of hydrogen bonds formed by hydroxyl groups, water molecules, and chloride ions. The IR spectra of Pr–, Nd–, and Sm–inositol complexes are similar, which shows that the three metal ions have the same coordination mode. The IR results are consistent with the crystal structure.