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Synthesis and characterization of polyborates templated by cationic copper(II) complexes: Structural (XRD), spectroscopic, thermal (TGA/DSC) and magnetic properties

Synthesis and characterization of polyborates templated by cationic copper(II) complexes: Structural (XRD), spectroscopic, thermal (TGA/DSC) and magnetic properties
Synthesis and characterization of polyborates templated by cationic copper(II) complexes: Structural (XRD), spectroscopic, thermal (TGA/DSC) and magnetic properties
Several polyborate containing species templated by cationic copper(II) coordination compounds have been synthesized. The ionic species [Cu(en)2][B5O6(OH)4]2·2H2O (en = 1,2-diaminoethane) (1), [Cu(dmen)2(H2O)][B5O6(OH)4]2·3H2O (dmen = N,N-dimethyl-1,2-diaminoethane) (2), [Cu(pn)2{B5O6(OH)4}][B5O6(OH)4]·4H2O (pn = 1,2-diaminopropane) (3), [Cu(dach)2(H2O)2][Cu(dach)2][B7O9(OH)5]2·4H2O (dach = 1,2-diaminocyclohexane) (4), and the neutral species [Cu(dmen){B6O7(OH)6}]·4H2O (5) and [Cu(tmeda){B6O7(OH)6}]·6H2O (tmeda = N,N,N′,N′-tetramethyl-1,2-diaminoethane) (6) have been synthesized in aqueous solution and characterized by spectroscopic and thermal (TGA/DSC) methods. The previously prepared compound [Cu(en)2][B4O5(OH)4]2·2B(OH)3 (7) has also been prepared by an alternative route. Compounds 1–6 have been further characterized by single-crystal XRD studies. The new compounds show extensive H-bond interactions and display a range of structural features: 1–3 have isolated pentaborate(1-) anions whilst 4 possesses an isolated heptaborate(2-) anion. In addition, 3 has a pentaborate(1-) and 5 and 6 have hexaborate(2-) anions directly coordinated to their copper(II) centers, in mondentate and tridentate manners, respectively. The copper(II) centers show a variety of coordination numbers and geometries: square-planar (1, 7), octahedral (4) and square-based pyramidal (2, 3, 5, 6). Thermal studies (TGA/DSC) and magnetic susceptibility measurements have been undertaken on all compounds.
0277-5387
247-257
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. (2017) Synthesis and characterization of polyborates templated by cationic copper(II) complexes: Structural (XRD), spectroscopic, thermal (TGA/DSC) and magnetic properties Polyhedron, 135, pp. 247-257.

Altahan, Mohammed A., Beckett, Michael A., Coles, Simon J. and Horton, Peter N. (2017) Synthesis and characterization of polyborates templated by cationic copper(II) complexes: Structural (XRD), spectroscopic, thermal (TGA/DSC) and magnetic properties Polyhedron, 135, pp. 247-257.

Record type: Article

Abstract

Several polyborate containing species templated by cationic copper(II) coordination compounds have been synthesized. The ionic species [Cu(en)2][B5O6(OH)4]2·2H2O (en = 1,2-diaminoethane) (1), [Cu(dmen)2(H2O)][B5O6(OH)4]2·3H2O (dmen = N,N-dimethyl-1,2-diaminoethane) (2), [Cu(pn)2{B5O6(OH)4}][B5O6(OH)4]·4H2O (pn = 1,2-diaminopropane) (3), [Cu(dach)2(H2O)2][Cu(dach)2][B7O9(OH)5]2·4H2O (dach = 1,2-diaminocyclohexane) (4), and the neutral species [Cu(dmen){B6O7(OH)6}]·4H2O (5) and [Cu(tmeda){B6O7(OH)6}]·6H2O (tmeda = N,N,N′,N′-tetramethyl-1,2-diaminoethane) (6) have been synthesized in aqueous solution and characterized by spectroscopic and thermal (TGA/DSC) methods. The previously prepared compound [Cu(en)2][B4O5(OH)4]2·2B(OH)3 (7) has also been prepared by an alternative route. Compounds 1–6 have been further characterized by single-crystal XRD studies. The new compounds show extensive H-bond interactions and display a range of structural features: 1–3 have isolated pentaborate(1-) anions whilst 4 possesses an isolated heptaborate(2-) anion. In addition, 3 has a pentaborate(1-) and 5 and 6 have hexaborate(2-) anions directly coordinated to their copper(II) centers, in mondentate and tridentate manners, respectively. The copper(II) centers show a variety of coordination numbers and geometries: square-planar (1, 7), octahedral (4) and square-based pyramidal (2, 3, 5, 6). Thermal studies (TGA/DSC) and magnetic susceptibility measurements have been undertaken on all compounds.

Text REVISED Manuscript BECKETT - Accepted Manuscript
Restricted to Repository staff only until 25 July 2018.

More information

Accepted/In Press date: 19 July 2017
e-pub ahead of print date: 25 July 2017
Published date: 15 October 2017

Identifiers

Local EPrints ID: 413948
URI: http://eprints.soton.ac.uk/id/eprint/413948
ISSN: 0277-5387
PURE UUID: 18dd0280-7809-498f-9acf-3262f5366209
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

Catalogue record

Date deposited: 11 Sep 2017 16:31
Last modified: 16 Nov 2017 06:16

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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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