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Synthesis and Crystal Structure of {(NH4)<i>x</i>Co(3-x/2)}(H2O)2[BP2O8] center dot (1-x)H2O (x approximate to 0.5)

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Schäfer,  G.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Carrillo-Cabrera,  W.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schnelle,  W.
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Borrmann,  H.
Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kniep,  R.
Rüdiger Kniep, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Schäfer, G., Carrillo-Cabrera, W., Schnelle, W., Borrmann, H., & Kniep, R. (2002). Synthesis and Crystal Structure of {(NH4)<i>x</i>Co(3-x/2)}(H2O)2[BP2O8] center dot (1-x)H2O (x approximate to 0.5). Zeitschrift für Anorganische und Allgemeine Chemie, 628(1), 289-294. doi:10.1002/1521-3749(200201)628:1<289:AID-ZAAC289>3.0.CO;2-H.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-31B9-A
Abstract
A borophosphate hydrate with general composition {(NH4)(x)Co((3-x)/2)}(H2O)(2)[BP2O8].(1-x) H2O (xapproximate to0.5) was prepared under mild hydrothermal conditions (T=170degreesC). The crystal structure of the purple title compound was refined in space group P6(5) (no. 170) as a meroihedric twin (a=949.14 pm, c=1558.25 pm, R-1=0.037, wR(2)=0.092 for all data). According to preliminary X-ray investigations, vis-spectra, and magnetic susceptibility measurements, a second blue coloured variant exhibits a superstructure of the title compound with a change in coordination numbers around cobalt from six and five to six and four. Both phases show reversible de-/rehydration properties.