Complex of trivalent lanthanum ion with galactitol in the solid state: the crystal structure and an FT-IR study of LaCl3 center dot galactitol center dot 6H(2)0

摘要

The crystal structure of LaC13-galactitol-61-120 has been determined. It is monoclinic. The space group is P2(1) with unit cell dimensions a = 10.5091(7), b = 12.5366(7), c = 14.4420(10) Angstrom, beta = 90.974(2)degrees, V = 1902.4(2) Angstrom(3) and Z = 4. Each La3+ ion in the unit cell is coordinated to 10 oxygen atoms, three from 01, 02 and 03 of one alditol, three from 04, 05 and 06 of another alditol and four from water molecules, with La-O distances from 2.5099 to 2.6916 Angstrom The other two water molecules are hydrogen-bonded. FT-IR spectrum of LaCl3.galactitol.6H(2)O is apparently different from that of other lanthanide-galactitol complexes. It is consistent with the differences between their crystal structures. Both the IR result and the crystal structure of LaCl3.galactitol.6H(2)O complex show that it has the different coordination mode compared with other lanthanide complexes. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 28]