Journal article
Crystal Structures and Magnetic Properties of NaK3(NpO2)4(SO4)4(H2O)2 and NaNpO2SO4H2O: Cation−Cation Interactions in a Neptunyl Sulfate Framework
Chemistry of materials, Vol.18(6), pp.1643-1649
03/21/2006
DOI: 10.1021/cm0523687
Abstract
Two novel neptunium(V) sulfates, NaK3(NpO2)4(SO4)4(H2O)2 and NaNpO2SO4H2O, have been prepared by hydrothermal methods. The structure of each has been determined by single-crystal X-ray diffraction using Mo Kα radiation and a charge-coupled device area detector. Both structures are monoclinic with space group C2/c. NaK3(NpO2)4(SO4)4(H2O)2 (R 1 = 0.0351) has unit cell parameters a = 18.0998(12), b = 5.7030(4), c = 23.1988(16), β = 104.6330(10)°, V = 2317.0(3) Å3, and Z = 16. NaNpO2SO4H2O (R 1 = 0.036) has unit cell parameters a = 18.3638(13), b = 5.6424(4), c = 23.5512(17), β = 103.366(2)°, V = 2374.2(3) Å3, and Z = 16. Both structures contain chains of Np(V)O7 pentagonal bipyramids linked into a framework structure through the sulfate tetrahedra. The neptunyl polyhedra are involved in multiple cation−cation interactions. Magnetic susceptibility data, together with field-dependent studies, indicate the presence of ferromagnetic ordering at 6.5(5) K for NaK3(NpO2)4(SO4)4(H2O)2 and 7.4(1) K for NaNpO2SO4H2O.
Details
- Title: Subtitle
- Crystal Structures and Magnetic Properties of NaK3(NpO2)4(SO4)4(H2O)2 and NaNpO2SO4H2O: Cation−Cation Interactions in a Neptunyl Sulfate Framework
- Creators
- Tori Z ForbesPeter. C BurnsL SoderholmS Skanthakumar
- Resource Type
- Journal article
- Publication Details
- Chemistry of materials, Vol.18(6), pp.1643-1649
- Publisher
- American Chemical Society
- DOI
- 10.1021/cm0523687
- ISSN
- 0897-4756
- eISSN
- 1520-5002
- Language
- English
- Date published
- 03/21/2006
- Academic Unit
- Civil and Environmental Engineering; Chemistry; Core Research Facilities
- Record Identifier
- 9984216566602771
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