Synthesis, structure, and characterization of hybrid materials:: [Ce(H2O)]2[O2 C(CH2)2CO2]3 and [Sm(H2O)]2[O2C(CH2)2CO2]3 •H2O

The rare-earth dicarboxylate hybrid materials [Ce(H2O)](2)[O2C(CH2)(2)CO2](3) ([Ce(Suc)]) and [Sm(H2O)](2)[O2C(CH2)(2)CO2](3)(H2O)-H-. ([Sm(Suc)]) have been hydrothermally synthesized (200degreesC, 3 days) under autogenus pressure. [Ce(Suc)] is triclinic, a = 7.961 (3)Angstrom, b = 8.176 (5) Angstrom, c = 14.32 (2) Angstrom, alpha = 97.07degrees (7), beta = 96.75degrees (8), gamma = 103.73degrees (6), and z = 2. The crystal structure of this compound has been determined using 3120 unique single crystal data. The final refinements let the agreement factors R-1 and wR(2)(F-2) converge to 0.0138 and 0.0363, respectively. [Ce(Suc)] is built up from infinite chains of edge-sharing nine-fold coordinated cerium atoms running along [100]. These chains are interconnected by the carbon atoms of the succinate anions, leading to a three-dimensional hybrid framework The cell constants of [Sm(Suc)], isotypic with monoclinic C2/c[Pr(H2O)](2)[O2C(CH2)(2)CO2](3)(H2O)-H-. ([Pr(Suc)]), were refined starting from X-ray powder data: a = 20.275 (3)Angstrom, b = 7.919 (6)Angstrom, c = 14.130 (3)Angstrom, and beta = 121.45degrees (1). Despite its lower symmetry, [Ce(Suc)] presents an important structural filiation with [Sm(Suc)] (C) 2004 Elsevier Inc. All rights reserved.