Synthesis and characterization of methylammonium phosphates as crystalline approximants for anhydrous, low melting phosphate glasses

Mangstl, Martin; Wied, Jan Konrad; Weber, Johannes; Pritzel, Christian; Trettin, R.; Günne, Jörn Schmedt auf der

doi:10.1039/c8ra07736c

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2021

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“…For the synthesis of organic borate salts low temperatures are required to preserve the integrity of the organic cation like the alkylammoniumions. An approach which has not been applied to borate synthesis yet is the formation of methylammonium borate salts by decomposition of formamides [29] …”

Section: Introductionmentioning

confidence: 99%

Volume Increments for Crystalline Borates

et al. 2021

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A set of volume increments for ionic oxido‐borates is developed for trigonal‐planar and tetrahedral coordinated boron fragments in densely packed crystal structures. For this purpose, the cell volume of 277 alkaline‐ and earth alkaline borate structures was analyzed with respect to the volume of different anionic borate building units. The volume increments help to determine the number of formula equivalents in a cell which is especially useful for the structure solution process starting from powder diffraction data. This was demonstrated on a new methylammonium borate, [H3CNH3]B5O6(OH)4 ⋅ CH3NHCOH which could be solved from powder X‐ray diffraction data. The compound crystallizes in the monoclinic space group P 1 21/c 1 with the lattice parameters a=7.3040(1) Å, b=11.6377(1) Å, c=17.1065(3) Å, β=107.2167(9)° and Z=4. The structure model is supported as well by 1H, 11B, 13C and 15N solid‐state NMR and quantum chemical calculations.

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Section: Introductionmentioning

confidence: 99%