Synthesis, characterization, and thermal properties of benzylammonium pentaborate [C6H5CH2NH3][B5O6(OH)4]

Beckett, Michael A., Horton, Peter N., Hursthouse, Michael B., Timmis, James L. and Varma, K. Sukumar (2010) Synthesis, characterization, and thermal properties of benzylammonium pentaborate [C6H5CH2NH3][B5O6(OH)4]. Collection of Czechoslovak Chemical Communications, 75 (9), 971-980. (doi:10.1135/cccc2010046).

Abstract

[C6H5CH2NH3][B5O6(OH)(4)] was obtained as colourless crystals in high yield from a MeOH/H2O (1:1) solution of benzylamine and boric acid (1:5). A single-crystal X-ray study confirmed that the solid-state structure was comprised of a supramolecular H-bonded pentaborate anion lattice, templated by the benzylammonium cations which occupy positions within the lattice cavities. Each pentaborate anion formed 4 H-bonds to 4 neighbouring pentaborate anions at alpha,alpha,alpha,beta acceptor sites. Additionally, each cation H-bonds to 3 pentaborate anions. Crystals were monoclinic, P2(1)/c, with a = 9.3511(2) angstrom, b = 14.5157(4) angstrom, c = 10.4670(2) angstrom, beta = 90.778(2)degrees, T = 120 K, V = 1420.64(6) angstrom(3), and Z = 4. TGA/DSC analysis showed that [C6H5CH2NH3][B5O6(OH)(4)] thermally decomposed in air at 800 degrees C to 2.5B(2)O(3), via a low-temperature (200-250 degrees C) dehydration step to a condensed pentaborate.

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Contributors

Author: Peter N. Horton

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