Inorganics (Mar 2019)

Hexaborate(2−) and Dodecaborate(6−) Anions as Ligands to Zinc(II) Centres: Self-Assembly and Single-Crystal XRD Characterization of [Zn{κ<sup>3</sup><i>O</i>-B<sub>6</sub>O<sub>7</sub>(OH)<sub>6</sub>}(κ<sup>3</sup><i>N</i>-dien)]·0.5H<sub>2</sub>O (dien = NH(CH<sub>2</sub>–CH<sub>2</sub>NH<sub>2</sub>)<sub>2</sub>), (NH<sub>4</sub>)<sub>2</sub>[Zn{κ<sup>2</sup><i>O</i>-B<sub>6</sub>O<sub>7</sub>(OH)<sub>6</sub>}<sub>2</sub> (H<sub>2</sub>O)<sub>2</sub>]·2H<sub>2</sub>O and (1,3-pnH<sub>2</sub>)<sub>3</sub>[(κ<sup>1</sup><i>N</i>-H<sub>3</sub>N{CH<sub>2</sub>}<sub>3</sub>NH<sub>2</sub>) Zn{κ<sup>3</sup><i>O</i>-B<sub>12</sub>O<sub>18</sub>(OH)<sub>6</sub>}]<sub>2</sub>·14H<sub>2</sub>O (1,3-pn = 1,3-diaminopropane)

  • Mohammed A. Altahan,
  • Michael A. Beckett,
  • Simon J. Coles,
  • Peter N. Horton

DOI
https://doi.org/10.3390/inorganics7040044
Journal volume & issue
Vol. 7, no. 4
p. 44

Abstract

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Two zinc(II) hexaborate(2−) complexes, [Zn{κ3O-B6O7(OH)6}(κ3N-dien)]·0.5H2O (dien = NH(CH2CH2NH2)2) (1) and (NH4)2[Zn{κ2O-B6O7(OH)6}2(H2O)2]·2H2O (2), and a zinc(II) dodecaborate(6−) complex, (1,3-pnH2)3[(κ1N-H3N{CH2}3NH2)Zn{κ3O-B12O18(OH)6}]2·14H2O (1,3-pn = 1,3-diaminopropane) (3), have been synthesized and characterized by single-crystal XRD studies. The complexes crystallized through self-assembly processes, from aqueous solutions containing 10:1 ratios of B(OH)3 and appropriate Zn(II) amine complex: [Zn(dien)2](OH)2, [Zn(NH3)4](OH)2, and [Zn(pn)3](OH)2. The hexaborate(2−) anions in 1 and 2 are coordinated to octahedral Zn(II) centres as tridentate (1) or bidentate ligands (2) and the dodecaborate(6−) ligand in 3 is tridentate to a tetrahedral Zn(II) centre.

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