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 Ce^IIIN₃O₆ 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 Nd^IIIN₃O₆ part in the complex anion has the same structure as Ce^IIIN₃O₆ 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) ų. 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) ų. The final R and Rw are 0.0253 and 0.0552 for reflection 2568 with [I> 2σ (I)], respectively.

Keywords:

• Ce(III)
• Nd(III)
• pyridine-2
• 6-dicarboxylate
• PDC
• isostructural
• molecular structure

Acknowledgment

We sincerely acknowledge SAIF, IIT Madras, Chennai for recording single crystal X-ray diffraction data and Dr. Babu Varghese, SAIF, IIT Madras, Chennai for useful suggestions in solving and refining the structures.

Supplementary Material

Crystallographic data for the structures reported here have been deposited with the Cambridge Crystallographic Data Centre (Deposition numbers: Ce-CCDC- 873369 and Nd-CCDC-873370). These data can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.