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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

A new polyborate anion, [B7O9(OH)6]3?: Self assembly, XRD and thermal properties of s-fac-[Co(dien)2][B7O9(OH)6]·9H2O
A new polyborate anion, [B7O9(OH)6]3?: Self assembly, XRD and thermal properties of s-fac-[Co(dien)2][B7O9(OH)6]·9H2O
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.
[B7O9(OH)6]3 ?, heptaborate(3-), s-fac-[Co(dien)]3 +, self-assembly, XRD structure
95-98
Altahan, Mohammed A.
a333d79b-2ef3-4c3f-86a2-519740d08a72
Beckett, Michael A.
5b021ef6-fa5c-4f6d-9998-3313558f0dc1
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Horton, Peter N.
154c8930-bfc3-495b-ad4a-8a278d5da3a5
Altahan, Mohammed A.
a333d79b-2ef3-4c3f-86a2-519740d08a72
Beckett, Michael A.
5b021ef6-fa5c-4f6d-9998-3313558f0dc1
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Horton, Peter N.
154c8930-bfc3-495b-ad4a-8a278d5da3a5

Altahan, Mohammed A., Beckett, Michael A., Coles, Simon J. and Horton, Peter 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, 95-98. (doi:10.1016/j.inoche.2015.07.011).

Record type: Article

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.

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Accepted/In Press date: 16 July 2015
e-pub ahead of print date: 17 July 2015
Published date: September 2015
Keywords: [B7O9(OH)6]3 ?, heptaborate(3-), s-fac-[Co(dien)]3 +, self-assembly, XRD structure
Organisations: Chemistry

Identifiers

Local EPrints ID: 382725
URI: https://eprints.soton.ac.uk/id/eprint/382725
PURE UUID: 9481e3fa-079f-4991-b82f-e452ffe2ca29
ORCID for Simon J. Coles: ORCID iD orcid.org/0000-0001-8414-9272
ORCID for Peter N. Horton: ORCID iD orcid.org/0000-0001-8886-2016

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Date deposited: 21 Oct 2015 10:39
Last modified: 31 Jul 2019 00:47

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Contributors

Author: Mohammed A. Altahan
Author: Michael A. Beckett
Author: Simon J. Coles ORCID iD
Author: Peter N. Horton ORCID iD

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