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A new polyborate anion, [B7O9(OH)6]3−: Self assembly, XRD and thermal properties of s-fac-[Co(dien)2][B7O9(OH)6]·9H2O

Altahan, M.A. and Beckett, M.A. and Coles, M.J. and Horton, P.N. (2015) A new polyborate anion, [B7O9(OH)6]3−: Self assembly, XRD and thermal properties of s-fac-[Co(dien)2][B7O9(OH)6]·9H2O. Inorganic Chemistry Communications, 59. pp. 95-98. DOI: 10.1016/j.inoche.2015.07.011

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Abstract

The title compound, s-fac-[Co(dien)2][B7O9(OH)6]·9H2O (1) (dien = HN(CH2CH2NH2)2), has been prepared as a crystalline solid in moderate yield (35%) from the reaction of B(OH)3 with [Co(dien)2][OH]3 in aqueous solution (10:1 ratio). The structure contains a novel polyborate anion [B7O9(OH)6]3 � which is structurally based on the known �ribbon� isomer of [B7O9(OH)5]2 �, with an additional [OH]� group coordinated to a B atom in one of the outer boroxole rings. Compound 1 is formed by a self-assembly process in which the cation and anion mutually template themselves from equilibrium mixtures under reaction conditions. The [B7O9(OH)6]3 � anions are H-bonded to each other in layers with �cavities� suitable for the [Co(dien]2]3 + complex. Three [B7O9(OH)6]3 � anions are in the secondary coordination sphere (via H-bonds) of each cation, with each anion H-bonded to three cations.

Item Type: Article
Subjects: Research Publications
Departments: College of Physical and Applied Sciences > School of Chemistry
Date Deposited: 16 Oct 2015 02:20
Last Modified: 17 Jul 2016 02:15
ISSN: 1387-7003
URI: http://e.bangor.ac.uk/id/eprint/5645
Identification Number: DOI: 10.1016/j.inoche.2015.07.011
Publisher: Elsevier
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