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(NH4)[B4O5(PO4)] - A Boron Rich Three-Dimensional Borophosphate
Vivien Wessels1, Henning A Höppe1
1Professur für Festkörperchemie und Materialwissenschaften, Institute of Physics, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany.
None:
(NH4)[B4O5(PO4)] was obtained as crystalline colorless powder via a solid state reaction in a closed system by using NH4H2PO4 and B2O3 at 400 °C under vacuum conditions. Single-crystal X-ray diffraction revealed a new structure type (Pbca, no. 61, Z = 8, a = 8.1998(19), b = 13.3359(17), c = 13.4682(16) Å, R1 = 0.0472, wR2 = 0.1289, 2121 data, 149 parameters). It comprises a three-dimensional anionic framework built up by [PO4], [BO4] and [BO3] units with charge balancing ammonium cations in the resulting one-dimensional channels. It represents only the third three-dimensional (3D) mixed-coordinated borophosphate revealing a new fundamental building unit. The titled compound is characterized by X-ray diffraction and electrostatic calculations. Besides, optical and thermal properties are investigated by FT-IR, UV-vis and thermogravimetry.
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