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Article

Oxidoborates Templated by Cationic Nickel(II) Complexes and Self-Assembled from B(OH)3

1
School of Natural Sciences, Bangor University, Bangor LL57 2UW, UK
2
School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
*
Author to whom correspondence should be addressed.
Current address: Chemistry Department, College of Science, University of Thi-Qar, Nasiryah 0096442, Iraq.
Academic Editors: Jean-François Halet and Gilles Alcaraz
Received: 19 August 2021 / Revised: 27 August 2021 / Accepted: 30 August 2021 / Published: 31 August 2021
(This article belongs to the Special Issue Boron Chemistry: Fundamentals and Applications)
Several oxidoborates, self-assembled from B(OH)3 and templated by cationic Ni(II) coordination compounds, were synthesized by crystallization from aqueous solution. These include the ionic compounds trans-[Ni(NH3)4(H2O)2][B4O5(OH)4].H2O (1), s-[Ni(dien)2][B5O6(OH)4]2 (dien = N-(2-aminoethyl)-1,2-ethanediamine (2), trans-[Ni(dmen)2(H2O)2] [B5O6(OH)4]2.2H2O (dmen = N,N-dimethyl-1,2-diaminoethane) (3), [Ni(HEen)2][B5O6(OH)4]2 (HEen = N-(2-hydroxyethyl)-1,2-diaminoethane) (4), [Ni(AEN)][B5O6(OH)4].H2O (AEN = 1-(3-azapropyl) -2,4-dimethyl-1,5,8-triazaocta-2,4-dienato(1-)) (5), trans-[Ni(dach)2(H2O)2][Ni(dach)2] [B7O9(OH)5]2.4H2O (dach = 1,2-diaminocyclohexane) (6), and the neutral species trans-[Ni(en)(H2O)2{B6O7(OH)6}].H2O (7) (en = 1,2-diaminoethane), and [Ni(dmen)(H2O){B6O7(OH)6}].5H2O (8). Compounds 1–8 were characterized by single-crystal XRD studies and by IR spectroscopy and 2, 4–7 were also characterized by thermal (TGA/DSC) methods and powder XDR studies. The solid-state structures of all compounds show extensive stabilizing H-bond interactions, important for their formation, and also display a range of gross structural features: 1 has an insular tetraborate(2-) anion, 2–5 have insular pentaborate(1-) anions, 6 has an insular heptaborate(2-) anion (‘O+’ isomer), whilst 7 and 8 have hexaborate(2-) anions directly coordinated to their Ni(II) centers, as bidentate or tridentate ligands, respectively. The Ni(II) centers are either octahedral (1–4, 7, 8) or square-planar (5), and compound 6 has both octahedral and square-planar metal geometries present within the structure as a double salt. Magnetic susceptibility measurements were undertaken on all compounds. View Full-Text
Keywords: borate anions; H-bonding; heptaborate(2-); hexaborate(2-); Nickel(II) complex; oxidoborate; pentaborate(1-); self-assembly; templated synthesis; tetraborate(2-); X-ray structures borate anions; H-bonding; heptaborate(2-); hexaborate(2-); Nickel(II) complex; oxidoborate; pentaborate(1-); self-assembly; templated synthesis; tetraborate(2-); X-ray structures
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MDPI and ACS Style

Altahan, M.A.; Beckett, M.A.; Coles, S.J.; Horton, P.N. Oxidoborates Templated by Cationic Nickel(II) Complexes and Self-Assembled from B(OH)3. Inorganics 2021, 9, 68. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9090068

AMA Style

Altahan MA, Beckett MA, Coles SJ, Horton PN. Oxidoborates Templated by Cationic Nickel(II) Complexes and Self-Assembled from B(OH)3. Inorganics. 2021; 9(9):68. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9090068

Chicago/Turabian Style

Altahan, Mohammed A., Michael A. Beckett, Simon J. Coles, and Peter N. Horton. 2021. "Oxidoborates Templated by Cationic Nickel(II) Complexes and Self-Assembled from B(OH)3" Inorganics 9, no. 9: 68. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9090068

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