A Model for Trivalent Actinides in Media Containing High Carbonate Concentrations − Structural Characterization of the Lanthanide Tetracarbonate [Co(NH3)6][Na(μ-H2O)(H2O)4]2[Ho(CO3)4]·4H2O

✍ Scribed by Deborah L. Bond; David L. Clark; Robert J. Donohoe; John C. Gordon; Pamela L. Gordon; D. Webster Keogh; Brian L. Scott; C. Drew Tait; John G. Watkin

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 324 KB
• Volume: 2001
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/1099-0682(200111)2001:11<2921::aid-ejic2921>3.0.co;2-2

✦ Synopsis

The identity of the limiting Ho III species in aqueous solutions with high carbonate concentrations has been determined to be Ho(CO 3 ) 4

were obtained by the addition of [Co(NH 3 ) 6 ] 3+ to an aqueous 0.04 M solution of Ho III in 2.1 M Na 2 CO 3 . The asymmetric unit contains the anion, [Ho(CO 3 ) 4 ] 5-, a [Co(NH 3 ) 6 ] 3+ cation and two Na + cations, which are bound to H 2 O molecules in an edge-sharing bioctahedral geometry. The [Ho(CO 3 ) 4 ] 5-anion is eight coordinate with four bidentate carbonate ligands bound to the Ho atom. The molecule has essentially C 2v symmetry with two coplanar carbonates making a vane, which is perpendicular to a similar vane produced by the other two carbonate ligands. An alternative way to this view molecule is through the geometry of the C atoms, which are found in a distorted [a