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Structural and thermal studies of non-metal cation pentaborate salts with cations derived from 1,5-diazobicyclo[4.3.0]non-5-ene, 1,8-diazobicyclo[5.4.0]undec-7-ene and 1,8-bis(dimethylamino)naphthalene

Beckett, M.A. and Horton, P.N. and Coles, S.J. and Kose, D.A. and Kreuziger, A-M. (2012) Structural and thermal studies of non-metal cation pentaborate salts with cations derived from 1,5-diazobicyclo[4.3.0]non-5-ene, 1,8-diazobicyclo[5.4.0]undec-7-ene and 1,8-bis(dimethylamino)naphthalene. Polyhedron, 38 (1). pp. 157-161. DOI: 10.1016/j.poly.2012.02.031

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Abstract

The reaction of the cyclic amines 1,5-diazobicyclo[4.3.0]non-5-ene (DBN), 1,8-diazobicyclo[5.4.0]undec-7-ene (DBU) and 1,8-bis(dimethylamino)naphthalene (PS) with B(OH)3 in a 1:5 ratio affords in high yields the non-metal cation pentaborate salts [HDBN][B5O6(OH)4] (1), [HDBU][B5O6(OH)4] (2) and [HPS][B5O6(OH)4]·B(OH)3 (3). Compounds 1�3 were characterized by spectroscopic studies (NMR, IR) and compounds 1 and 3 were further characterized by single-crystal XRD studies. The pentaborate salts compounds show extensively H-bonded supramolecular anionic lattices which are templated by the cations. Thermal analysis (TGA) of 1�3 showed that thermally decomposed in air at 1000° to B2O3 in a two step process involving dehydration (<250 °C) and oxidation (250�600 °C). BET analysis of materials derived from thermolysis of 1�3 had internal porosities of <1 m2/g.

Item Type: Article
Subjects: Research Publications
Departments: College of Physical and Applied Sciences > School of Chemistry
Date Deposited: 16 Oct 2015 02:21
Last Modified: 16 Oct 2015 02:21
ISSN: 0277-5387
URI: http://e.bangor.ac.uk/id/eprint/5650
Identification Number: DOI: 10.1016/j.poly.2012.02.031
Publisher: Elsevier
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