Two new Cerium-Organic Frameworks with unusual network topologies constructed by racemic tartaric acid involving in situ reaction

Hydrothermal reactions of CeO2 with racemic tartaric acid (H2tar) at different temperature yielded two novel Cerium-Organic Framworks, [Ce2(tar)2(C2O4)(H2O)2]n·4nH2O (1) and [Ce2(tar)2(C2O4)(H2O)4]n (2). 1 displays an unprecedented fsx-4,5-P21/c topology, which contains hydrophilic channels constructed by triple helical chains along a axis; 2 exhibits a 2D layer framework with a binodal (3,4)-connected V2O5 network. Notably, in both 1 and 2, the oxalate ligands were in situ synthesized from H2tar.