Hydrothermal Syntheses and Characterization of Novel 3D Open-Framework and 2D Grid Lanthanide Fumarates: Ln<sub>2</sub>(fum)<sub>3</sub>(H<sub>2</sub>fum)(H<sub>2</sub>O)<sub>2</sub> (Ln = Ce or Nd), [Sm<sub>2</sub>(fum)<sub>3</sub>(H<sub>2</sub>O)<sub>4</sub>](H<sub>2</sub>O)<sub>3</sub>, and [Yb<sub>2</sub>(fum)<sub>3</sub>(H<sub>2</sub>O)<sub>4</sub>](H<sub>2</sub>O)<sub>2</sub>
收藏资源简介：
Four novel open-framework or rectangular grid coordination polymers of lanthanide fumarates, where the lanthanides CeIII, NdIII, SmIII and YbIII were used, were readily synthesized and structurally characterized. The direct hydrothermal reaction of fumaric acid and appropriate lanthanide oxides provided a highly efficient approach to the syntheses of multidimensional framework solids. Two types of three-dimensional (3D) open frameworks, Ln2(fum)3(H2fum)(H2O)2 (Ln = Ce or Nd; 1 and 2) and [Sm2(fum)3(H2O)4](H2O)3 (3), and one two-dimensional (2D) rectangular grid polymer, [Yb2(fum)3(H2O)4](H2O)2 (4), have been isolated from the hydrothermal reaction. The solids 1 and 2 are isostructural and consist of three types of ligand binding modes contributing to link the metal−O polyhedral chains to 3D open-framework architectures. Compound 3 has a 3D open-framework structure remarkably different from those of 1 and 2, owing to distinct ligand bridging patterns. The framework is microporous and incorporates some crystalline water molecules therein by hydrogen-bonding interactions. In contrast, the structure of compound 4 features a 2D rectangular grid-like framework composed of large cavities (10.5 × 9.4 Å2). Furthermore, the thermal behaviors and PXRD patterns of four compounds correlated with the corresponding structural features have been also investigated.
