What question did this study set out to answer?

This research aims to characterize a new boron-rich three-dimensional borophosphate compound through various analytical methods.

February 13, 2026

(NH 4 )B 4 O 5 (PO 4 ) – A Boron Rich Three-Dimensional Borophosphate

Key Points

This research aims to characterize a new boron-rich three-dimensional borophosphate compound through various analytical methods.
Synthesis via solid state reaction using NH4H2PO4 and B2O3 at 400 °C under vacuum
Single-crystal X-ray diffraction for structural determination
FT-IR and UV-vis spectroscopy for optical property analysis
Thermogravimetry for thermal property assessment
New structure type identified through single-crystal X-ray diffraction
Three-dimensional anionic framework consisting of [PO4], [BO4], and [BO3] units
Only the third 3D mixed-coordinated borophosphate reported
Detailed characterization of optical and thermal properties
Electrostatic calculations supporting the structural stability

Abstract

(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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Cite This Study

Wessels et al. (Tue,) studied this question.

synapsesocial.com/papers/698ebedd85a1ff6a93016383 https://doi.org/https://doi.org/10.1021/acs.inorgchem.5c05922

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