ISSN:
1600-5759
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The three title complexes, namely pentasodium tris(2,2′-oxydiacetato)neodymium(III) bis(tetrafluoroborate) hexahydrate and its samarium(III) and gadolinium(III) analogues, (I)–(III), respectively, are isomorphous and isostructural and have crystallographic D3 symmetry. The lanthanide metal ions are nine-coordinate, binding to three O atoms of three oxodiacetate ligands. One Na+ ion is octahedrally coordinated to six O atoms and the other Na+ ion is octahedrally coordinated to four O atoms and two F atoms. The structure is effectively an infinite three-dimensional polymer, consistent with the exceptional crystal quality. The racemic solutions spontaneously resolve on crystallization. For the individual crystals selected for structural analysis, the Nd and Sm complexes have the Λ configuration, while the Gd complex has the Δ configuration. The lanthanide–oxygen distances show the expected contraction of ca 0.02 Å with increasing atomic number for the lanthanide metal.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108270100012087
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