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

Synthesis, characterization, and thermal properties of benzylammonium pentaborate [C6H5CH2NH3][B5O6(OH)4]
Synthesis, characterization, and thermal properties of benzylammonium pentaborate [C6H5CH2NH3][B5O6(OH)4]
[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.
971-980
Beckett, Michael A.
5b021ef6-fa5c-4f6d-9998-3313558f0dc1
Horton, Peter N.
154c8930-bfc3-495b-ad4a-8a278d5da3a5
Hursthouse, Michael B.
57a2ddf9-b1b3-4f38-bfe9-ef2f526388da
Timmis, James L.
3bc450de-1482-49d1-8e75-3d957a989300
Varma, K. Sukumar
a6c58cf1-503a-41ab-8021-aa982e388712
Beckett, Michael A.
5b021ef6-fa5c-4f6d-9998-3313558f0dc1
Horton, Peter N.
154c8930-bfc3-495b-ad4a-8a278d5da3a5
Hursthouse, Michael B.
57a2ddf9-b1b3-4f38-bfe9-ef2f526388da
Timmis, James L.
3bc450de-1482-49d1-8e75-3d957a989300
Varma, K. Sukumar
a6c58cf1-503a-41ab-8021-aa982e388712

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).

Record type: Article

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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More information

Published date: 2010
Organisations: Organic Chemistry: Synthesis, Catalysis and Flow

Identifiers

Local EPrints ID: 347476
URI: https://eprints.soton.ac.uk/id/eprint/347476
PURE UUID: 1762bbeb-b5b4-4653-ba58-89b0b616e703
ORCID for Peter N. Horton: ORCID iD orcid.org/0000-0001-8886-2016

Catalogue record

Date deposited: 25 Jan 2013 15:13
Last modified: 20 Jul 2019 01:08

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