skip to main content

Title: Two new families of lanthanide mixed-ligand complexes, oxalate-carbonate and oxalate-formate: Synthesis and structure of [Ce(H{sub 2}O)]{sub 2}(C{sub 2}O{sub 4}){sub 2}(CO{sub 3}){center_dot}2.5 H{sub 2}O and Ce(C{sub 2}O{sub 4})(HCO{sub 2})

Two new families of lanthanide complexes associating the ligand oxalate and carbonate or oxalate and formate have been prepared under autogenous pressure at 200{degrees}C using a pseudo-hydrothermal method. The two families have been extended to some lanthanides (Ln): oxalate-carbonate Ln = Ce, Pr, Nd, and Eu; oxalate-formate Ln = La, Ce, and Sm. The starting suspension contains either oxalate or a mixture of oxalate and oxalic acid. The structures have been solved for the element cerium. In both cases, the structure is built up form cerium atoms sharing all their oxygen atoms with oxalate and carbonate or oxalate and formate ligands thus forming a three-dimensional network. The cerium polyhedra share either faces or edges or corners. The coordination scheme of the oxalate ligands is variable: bischelating, bischelating and monodentate, or bischelating and bismonodentate. The carbonate group acts as a bischelating and bismonodentate ligand while the formate group is chelating and monodentate. The characterization of these two original families by infrared spectra and thermal behavior is presented for some pure phases. A tentative explanation of the synthesis of these two phases will be emphasized.
Authors:
; ;  [1]
  1. CEMES/CNRS, Toulouse (France)
Publication Date:
OSTI Identifier:
508632
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 127; Journal Issue: 2; Other Information: PBD: Dec 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 40 CHEMISTRY; OXALATES; CRYSTAL STRUCTURE; CARBONATES; FORMATES; HYDRATES; CERIUM COMPLEXES; CHEMICAL PREPARATION; PRASEODYMIUM COMPLEXES; NEODYMIUM COMPLEXES; EUROPIUM COMPLEXES; LANTHANUM COMPLEXES; SAMARIUM COMPLEXES; ABSORPTION SPECTROSCOPY