Series of anion-directed lanthanide-rigid-flexible frameworks: syntheses, structures, luminescence and magnetic properties

Crystal structure of poly[triaqua-µ2-sulfato-κ4O,O':O'',O'''-pyridine-3,5-dicarboxylato-κ4O,O':O'':O''']cerium(III) monohydrate, C7H11CeNO10S

“…The sulfate anion acts as tetradentate bridging and chelating ligand to connect two adjacent Ce1 ions in a antianti mode. The sulfate does not link these dimer unit into 1D dimensional chain, as observed in other lanthanide complexes [4]. The 3,5-DPA 2-ligand, forms two four-membered Ce/C/C/O rings, as the ligands based on the gemdiol or the hemiacetal forms of di-2-pyridincarboxylate or ketone have been observed in numerous ligation modes [7].…”

“…In the past decade there are numerous reports on lanthanide-organic hybrids because of their fascinating structures [2]. Nowadays, lanthanide coordination polymers based on polycarboxylic ligands are prevalent because of their high structural stability and various coordination modes [3,4]. The addition of completely or partially deprotonated carboxylate groups on the molecules is beneficial to the formation of unusual multidimensional architectures.…”

Crystal structure of bis(dimethylammonium) hemi[1,2-bis(hydrogen 1,3-dicarboxylatophenyl)diazene] hemi[1,2-bis(hydrogen 1,3-dicarboxylatophenyl) diazene oxide], [C2H8N]2[C16H8N2O8]0.5[C16H8N2O9]0.5

“…After the mixture was slowly cooled to room temperature, block-shaped red crystals were obtained, and the product is insoluble in water. The Ce(IV) cations do not present in the final product, which mayb ed ue to the acidic conditions [1]. When as imilar reaction was performed in the absence of Ce(SO 4 ) 2 × 6H 2 Oi nt he reaction mixture, the samec ompound could not be obtained, which indicates that the Ce(IV) ion plays an important role in selective oxidation of the organic compound to form final products.…”

Crystal structure of ammonium 2-carboxy-5(4-oxopyridine-(4H)-yl)-benzoate monohydrate, C13H14N2O6

“…The versatility of organic ligands has also been accepted as the major advantage of coordination polymers. Judicious selection/design of organic ligands is the key approach for desired structures and functions [3,4]. In the past two decades, many types of polytopic organic ligands with different donor groups, such as carboxylate, pyridyl, amine, benzene, phosphate, etc., have been used in the generation of coordination polymers [5].…”