STRUCTURES OF NEODYMIUM(III) COMPLEXES WITH AMINO-ACIDS - (I) CATENA-POLY([TRIAQUATRICHLORONEODYMIUM(III)]-MU-(BETA-ALANINE-O,O')) - (II) PENTAAQUACHLORO-MU-(L-PROLINE-O,O')-NEODYMIUM(III) HEXAAQUA-MU-(L-PROLINE-O,O')-NEODYMIUM(III) PENTACHLORIDE

(I) [NdCl3(H2O)3(C3H7NO2)], M(r) = 393.7, monoclinic, P2(1)/c, a = 6.018 (2), b = 16.562 (6), c = 12.518 (4) angstrom, beta = 116.18 (4)degrees, V = 1119.7 angstrom 3, Z = 4, D(m) = 2.33, D(x) = 2.34 Mg m-3. Mo K-alpha, lambda = 0.71069 angstrom, mu = 5.36 mm-1, F(000) = 756, T = 298 (2) K. Final R = 0.035 for 2363 reflections with F > 6-sigma(F). (II) [NdCl(H2O)5(C5H9NO2)]Cl2.-[Nd(H2O)6(C5H9NO2)]Cl3, M(r) = 929.6, monoclinic, C2, a = 25.076 (5), b = 8.132 (2), c = 18.361 (4) angstrom, beta = 120.68 (5)degrees, V = 3220.1 angstrom 3, Z = 4, D(m) 1.93, D(x) = 1.92 Mg m-3, Mo K-alpha, lambda = 0.71069 angstrom, mu = 3.76 mm-1, F(000) = 1824, T = 298 (3) K. Final R = 0.040 for 3540 reflections with F > 7-sigma(F). These are the first known cases of lanthanide carboxylate complexes where the inner sphere contains Cl ions attached to the metal. In both structures the Nd ions are eight coordinate. There are three Cl ions bonded to the Nd(III) centre in (I) while in (II) one Cl ion is attached to Nd(1) and Nd(2) is coordinated exclusively by O atoms. The structure of (I) is that of a linear polymer while that of (II) consists of dinuclear species of two distinct types. The carboxylate group acts as a bridging ligand in both structures.