Metal ion interactions with sugars. The crystal structure and FT-IR study of the NdCl3–ribose complex Original Research Article

The single-crystal structure of neodymium chloride–ribopyranose pentahydrate, NdCl3·C5H10O5·5H2O was determined to have Mr=490.80, a=9.138(11), b=8.830(10), c=9.811(11) Å, β=94.087(18)°, V=789.7(16) Å3, P21, Z=2, μ=0.71073 Å and R=0.0198 for 2075 observed reflections. The ligand of the title complex was observed in a disordered state and two molecular configurations of NdCl3·C5H10O5·5H2O were found in the single crystal as a pair of isomers. Both ligand moieties of the two molecules are ribopyranose forms, providing three hydroxyl groups in ax–eq–ax orientation for coordination. One ligand of the pair of isomers is β-d-ribopyranose in the 1C4 conformation, and the other is α-d-ribopyranose in the 4C1 conformation. The Nd3+ ion is nine-coordinated with five NdO bonds from water molecules, three NdO bonds from hydroxyl groups of the ribopyranose and one NdCl bond from chloride ion. The hydroxyl groups, water molecules, chloride ions form an extensive hydrogen-bond network. The IR spectral CC,OH,CO and COH vibrations were observed to be shifted in the complex and the IR results are in accordance with those of X-ray spectroscopy.