Syntheses, Characterization and Structural Determination of Nine Coordinated (C6H5N2H4)3[Ce(OOC-C5H3N-COO)3].4H2O and (C6H5N2H4)3[Nd(OOC-C5H3N-COO)3].4H2O

Abstract

Phenyl hydrazinium complexes of Ce(III) and Nd(III) pyridine-2,6-dicarboxylate hydrates have been synthesized and characterized by metal and elemental analyses, infrared spectra, thermal analyses, X-ray power diffraction, and single-crystal X-ray diffraction techniques. The X-ray powder diffraction patterns and infrared spectra of the complexes are super imposable indicating their structural similarity. The CeIIIN3O6 parts in the complex anion has a hexagonal nine-coordinate structure in which the nine coordinated atoms (three N and six O) from pyridine-2,6-dicarboxylate ions are coordinated to the central rare earth metal ion directly. The NdIIIN3O6 part in the complex anion has the same structure as CeIIIN3O6 part. The crystal of the cerium complex belongs to the hexagonal crystal packing and p-3 space group. The crystal data are a = 16.4610(6) Å, b = 16.4610(6) Å, c = 9.305(5) Å, α = β = 90° and γ = 120°, V = 2183.5(12) Å3. The final R and Rw are 0.0287 and 0.0758 for reflection 2582 with [I> 2σ (I)], respectively. The crystal of the neodymium complex is isostructural with the cerium complex and whose crystal data are a = 16.399(2) Å, b = 16.399(2) Å, c = 9.3330(10) Å, α = β = 90° and γ = 120°, V = 2173.6(4) Å3. The final R and Rw are 0.0253 and 0.0552 for reflection 2568 with [I> 2σ (I)], respectively.