Rebuttal of the Existence of Solid Rare Earth Bicarbonates and the Crystal Structure of Holmium Nitrate Pentahydrate. Issue 6 (8th February 2017)

• Record Type: Journal Article
• Authors: Rincke, Christine; Schmidt, Horst; Voigt, Wolfgang
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 643:Issue 6(2017)
• Page Start: 437
• Page End: 442
• Publication Date: 2017-02-08
• Subjects: Rare earth; Bicarbonate; Nitrate; Structure elucidation; X‐ray diffraction; Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201600436
• Languages: English
• ISSNs: 0044-2313

Abstract

Abstract : The synthesis routes of Gd(HCO3 )3 · 5H2 O and Ho(HCO3 )3 · 6H2 O, which are the only known bicarbonates of rare earth metals, were refuted and the published crystal structures were discussed. Because of the structural relationship of Ho(HCO3 )3 · 6H2 O to rare earth nitrate hexahydrates, 1 the synthesis of holmium nitrate hydrate was considered and the crystal structure of Ho(NO3 )3 · 5H2 O was solved by single crystal X‐ray diffraction measurements. Ho(NO3 )3 · 5H2 O was determined to crystallize in the triclinic space group P 1 (no. 2) with a = 6.5680(14) Å, b = 9.503(2) Å, c = 10.462(2) Å, α = 63.739(14)°, β = 94.042(2)° and γ = 76.000(16)°. The crystal structure consists of isolated [Ho(H2 O)4 (NO3 )3 ] polyhedra and non‐coordinating water molecules. It is isotypic to other rare earth nitrate pentahydrates. Abstract :