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Oxidopolyborate anions templated by transition-metal complex cations: Self-assembled syntheses and structural studies (XRD) of [Co(NH3)6]2[B4O5(OH)4]3·11H2O, [Ni(phen)3][B7O9(OH)5].9.5H2O and [Zn(dac)2(H2O)2][B7O9(OH)5]·H2O

Oxidopolyborate anions templated by transition-metal complex cations: Self-assembled syntheses and structural studies (XRD) of [Co(NH3)6]2[B4O5(OH)4]3·11H2O, [Ni(phen)3][B7O9(OH)5].9.5H2O and [Zn(dac)2(H2O)2][B7O9(OH)5]·H2O
Oxidopolyborate anions templated by transition-metal complex cations: Self-assembled syntheses and structural studies (XRD) of [Co(NH3)6]2[B4O5(OH)4]3·11H2O, [Ni(phen)3][B7O9(OH)5].9.5H2O and [Zn(dac)2(H2O)2][B7O9(OH)5]·H2O
The new oxidopolyborate salts [Co(NH3)6]2[B4O5(OH)4]3.11H2O (1), [Ni(phen)3][B7O9(OH)5].9.5H2O (2), and [Zn(dac)2(H2O)2][B7O9(OH)5].H2O (3), were crystallized, in moderate yields, from aqueous solutions containing B(OH)3 and the hydroxide salt of the corresponding cationic metal complex (prepared in situ) in moderate yields. Complexes 1-3, characterized by spectroscopic (NMR, IR) and thermal (TGA) methods and by single-crystal XRD studies, were obtained through cation-templated self-assembly reactions. Compound 1 contains insular tetraborate(2-) anions (4-1:2 + 2T) and 2 and 3 both contain insular heptaborate(2-) anions (‘O+’ isomer, 6:(3+ 3T) + ). The X-ray structures show that in all three compounds the polyborate anions are H-bonded together into extended networks, and there are multiple cation-anion H-bond interactions present in 1 and 3. Compound 2 has cation-cation -stacking interactions. These interactions are likely to be responsible for templating the observed structures. Thermal decomposition of 1-3 in air yielded amorphous anhydrous borates of composition CoB6O10.5, NiB7O11.5 and ZnB7O11.5, respectively.
0022-2860
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
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
154c8930-bfc3-495b-ad4a-8a278d5da3a5

Altahan, Mohammed A., Beckett, Michael A., Coles, Simon J. and Horton, Peter (2020) Oxidopolyborate anions templated by transition-metal complex cations: Self-assembled syntheses and structural studies (XRD) of [Co(NH3)6]2[B4O5(OH)4]3·11H2O, [Ni(phen)3][B7O9(OH)5].9.5H2O and [Zn(dac)2(H2O)2][B7O9(OH)5]·H2O. Journal of Molecular Structure, 1200, [127071]. (doi:10.1016/j.molstruc.2019.127071).

Record type: Article

Abstract

The new oxidopolyborate salts [Co(NH3)6]2[B4O5(OH)4]3.11H2O (1), [Ni(phen)3][B7O9(OH)5].9.5H2O (2), and [Zn(dac)2(H2O)2][B7O9(OH)5].H2O (3), were crystallized, in moderate yields, from aqueous solutions containing B(OH)3 and the hydroxide salt of the corresponding cationic metal complex (prepared in situ) in moderate yields. Complexes 1-3, characterized by spectroscopic (NMR, IR) and thermal (TGA) methods and by single-crystal XRD studies, were obtained through cation-templated self-assembly reactions. Compound 1 contains insular tetraborate(2-) anions (4-1:2 + 2T) and 2 and 3 both contain insular heptaborate(2-) anions (‘O+’ isomer, 6:(3+ 3T) + ). The X-ray structures show that in all three compounds the polyborate anions are H-bonded together into extended networks, and there are multiple cation-anion H-bond interactions present in 1 and 3. Compound 2 has cation-cation -stacking interactions. These interactions are likely to be responsible for templating the observed structures. Thermal decomposition of 1-3 in air yielded amorphous anhydrous borates of composition CoB6O10.5, NiB7O11.5 and ZnB7O11.5, respectively.

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Accepted/In Press date: 11 September 2019
e-pub ahead of print date: 13 September 2019
Published date: 15 January 2020

Identifiers

Local EPrints ID: 434789
URI: http://eprints.soton.ac.uk/id/eprint/434789
ISSN: 0022-2860
PURE UUID: 67729387-05b8-42e1-a19b-12796cefe5e1
ORCID for Simon J. Coles: ORCID iD orcid.org/0000-0001-8414-9272
ORCID for Peter Horton: ORCID iD orcid.org/0000-0001-8886-2016

Catalogue record

Date deposited: 09 Oct 2019 16:30
Last modified: 29 Oct 2019 01:58

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