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

The title compound, PrCl3.C6H12O6. 9H(2)O crystallized in the monoclinic sp ace group P2(1)/n with cell dimensions a = 15.8293(3), b = 8.67750(10), c = 16.2292(3) Angstrom, beta = 107.0788(8)degrees, V= 2130.92(6) Angstrom (3) and Z=4. Each Pr ion is coordinated to nine oxygen atoms, two from the ino sitol and seven from water molecules, with Pr-O distances from 2.4729 to 2. 6899 Angstrom; the other two water molecules are hydrogen-bonded. No direct contacts exist between Pr and Cl. There is an extensive network of hydroge n bonds formed by hydroxyl groups, water molecules, and chloride ions. The LR 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 a re consistent with the crystal structure. (C) 2000 Published by Elsevier Sc ience Ltd. All rights reserved.