Sugar interaction with metal ions. The crystal structure and Raman spectrastudy of SmCl3-galactitol complex

The crystal structure of 2SmCl(3). galactitol . 14H(2)O has been determined . The crystal system is triclinic, space group: P-1. The unit cell dimensio ns: a = 9.683(2) Angstrom, b = 10.341(2) Angstrom, c = 7.990(2) Angstrom; a lpha = 108.01(3)degrees, beta = 92.71(3)degrees, gamma = 88.42(3)degrees. E ach Sm atom is coordinated to nine oxygen atoms, three from the alditol and six from water molecules, with Sm-O distance from 2.417 to 2.520 Angstrom. The seventh water molecule is hydrogen-bonded by the hydroxy hydrogen on O -3 (O(3)-H(13). . .O(10), 2.635 Angstrom). After forming complexes the peak s have shifted and the relative intensities have changed in the IR and Rama n spectra, which are corresponding to the changes in bond distances and bon d angles of the structures. The IR and Raman spectra of Pr-, Nd- and Sm-gal actitol complexes are similar, which show that the three metal ions have th e same coordination mode. (C) 2001 Elsevier Science B.V. All rights reserve d.