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  Ionothermal Synthesis, Crystal Structure, and Magnetic Study of Co2PO4OH Isostructural with Caminite

Wang, G., Valldor, M., Spielberg, E. T., & Mudring, A.-V. (2014). Ionothermal Synthesis, Crystal Structure, and Magnetic Study of Co2PO4OH Isostructural with Caminite. Inorganic Chemistry, 53(6), 3072-3077. doi:10.1021/ic4029904.

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Wang, Guangmei1, Author
Valldor, Martin2, Author              
Spielberg, Eike T.1, Author
Mudring, Anja-Verena1, Author
Affiliations:
1external, ou_persistent22              
2Martin Valldor, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863454              

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 Abstract: A new framework cobalt(II) hydroxyl phosphate, Co2PO4OH, was prepared by ionothermal synthesis using 1-butyl-4-methyl-pyridinium hexafluorphosphate as the ionic liquid. As the formation of Co2PO4F competes in the synthesis, the synthesis conditions have to be judiciously chosen to obtain well-crystallized, single phase Co2PO4OH. Single-crystal X-ray diffraction analyses reveal Co2PO4OH crystallizes with space group I4(1)/amd (a = b = 5.2713(7) angstrom, c = 12.907(3) angstrom, V = 358.63(10) angstrom(3), and Z = 4). Astonishingly, it does not crystallize isotypically with Co2PO4F but rather isotypically with the hydroxyl minerals caminite Mg-1.33[SO4(OH)(0.66)(H2O)(0.33)] and lipscombite Fe2-yPO4(OH) (0 <= y <= 2/3). Phosphate tetrahedra groups interconnect four rod-packed face-sharing (1)(infinity){CoO6/2} octahedra chains to form a three-dimensional framework structure. The compound Co2PO4OH was further characterized by powder X-ray diffraction, Fourier transform-infrared, and ultraviolet-visible spectroscopy, confirming the discussed structure. The magnetic measurement reveals that Co2PO4OH undergoes a magnetic transition and presents at low temperatures a canted antiferromagnetic spin order in the ground state.

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 Dates: 2014-03-17
 Publication Status: Published in print
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 Identifiers: ISI: 000333142800040
DOI: 10.1021/ic4029904
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Title: Inorganic Chemistry
  Abbreviation : Inorg. Chem.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 53 (6) Sequence Number: - Start / End Page: 3072 - 3077 Identifier: ISSN: 0020-1669
CoNE: https://pure.mpg.de/cone/journals/resource/0020-1669