A New Decaoxidooctaborate(2−) Anion, [B8O10(OH)6]2–: Synthesis and Characterization of [Co(en)3][B5O6(OH)4][B8O10(OH)6)]·5H2O (en = 1,2-Diaminoethane)

Altahan, Mohammed A.; Beckett, Michael A.; Coles, Simon J.

doi:10.1021/ic5027834

Cited by 38 publications

(22 citation statements)

References 35 publications

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“…We have developed a strategy to overcome pentaborate(1−) salt formation by utilizing more highly charged (> (+1)) metal complex cations with ligands having the potential to form multiple H-bond interactions to template crystallization from aqueous solution of polyborate salts of unusual structures. In this context we have isolated two novel polyborate anions: [B 7 O 9 (OH) 6 ] 3− [12] and [B 8 O 10 (OH) 6 ] 2− [13]. We have also recently started to investigate Zn(II)/polyborate chemistry and have been able to isolate an insular bi-Zn(II) complex containing a rare dodecaborate(6−) anion [14] and two polymeric 1-D coordination chains with hexaborate(2−) ligands bridging Zn(II) centres [15].…”

Section: Introductionmentioning

confidence: 99%

“…The structures of these two anions are drawn schematically in Figure 1. [13]. We have also recently started to investigate Zn(II)/polyborate chemistry and have been able to isolate an insular bi-Zn(II) complex containing a rare dodecaborate(6−) anion [14] and two polymeric 1-D coordination chains with hexaborate(2−) ligands bridging Zn(II) centres [15].…”

Section: Introductionmentioning

confidence: 99%

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Hexaborate(2−) and Dodecaborate(6−) Anions as Ligands to Zinc(II) Centres: Self-Assembly and Single-Crystal XRD Characterization of [Zn{κ3O-B6O7(OH)6}(κ3N-dien)]·0.5H2O (dien = NH(CH2–CH2NH2)2), (NH4)2[Zn{κ2O-B6O7(OH)6}2 (H2O)2]·2H2O and (1,3-pnH2)3[(κ1N-H3N{CH2}3NH2) Zn{κ3O-B12O18(OH)6}]2·14H2O (1,3-pn = 1,3-diaminopropane)

2019

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hexaborate(2−) and Dodecaborate(6−) Anions as Ligands to Zinc(II) Centres: Self-Assembly and Single-Crystal XRD Characterization of [Zn{κ3O-B6O7(OH)6}(κ3N-dien)]·0.5H2O (dien = NH(CH2–CH2NH2)2), (NH4)2[Zn{κ2O-B6O7(OH)6}2 (H2O)2]·2H2O and (1,3-pnH2)3[(κ1N-H3N{CH2}3NH2) Zn{κ3O-B12O18(OH)6}]2·14H2O (1,3-pn = 1,3-diaminopropane)

2019

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“…In addition, cations that specifically could form many H-bond donor interactions with polyborate anions were chosen. This strategy was successful and we recently reported two such novel isolated polyborate anions: heptaborate (3−) [14] and octaborate (2−) [15].…”

Section: Introductionmentioning

confidence: 99%

Two 1-D Coordination Polymers Containing Zinc(II) Hexaborates: [Zn(en){B6O7(OH)6}]·2H2O (en = 1,2-diaminoethane) and [Zn(pn){B6O7(OH)6}]·1.5H2O (pn = 1,2-diaminopropane)

2018

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The synthesis and characterization by single-crystal X-ray diffraction (XRD) studies of two new zinc(II) hexaborate(2−) complexes, [Zn(en){B6O7(OH)6}]·2H2O (en = 1,2-diaminoethane) (1) and [Zn(pn){B6O7(OH)6}]·1.5H2O (pn = 1,2-diaminopropane) (2), are reported. These complexes crystallize from aqueous solutions containing 10:1 ratios of B(OH)3 and the appropriate Zn(II) amine complexes ([Zn(en)3][OH]2 or [Zn(pn)3][OH]2) through self-assembly processes. The hexaborate(2−) anions in 1 and 2 are coordinated to two Zn(II) centers and form one-dimensional (1-D) polymeric coordination chains. R22(8) and R22(6) inter-chain H-bond interactions play an important role in these self-assembly processes and are discussed.

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“…Salts containing polyborate anions other than pentaborate(1-) are relatively rare [6]. We are interested in the synthesis of structurally novel polyborate anions and have adopted a strategy of templating such species by the use of sterically demanding and/or highly charged cations [7]. Herein, we report the self-assembly of a salt containing a novel isolated heptaborate(3-) anion, partnered with cationic transition-metal coordination complex.…”

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confidence: 99%

A new polyborate anion, [B 7 O 9 (OH) 6 ] 3− : Self assembly, XRD and thermal properties of s-fac- [Co(dien) 2 ][B 7 O 9 (OH) 6 ]·9H 2 O

Altahan

Beckett

Coles

2015

Inorganic Chemistry Communications

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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. ___________________________________________________________________________Polyborate anions are conveniently classified as either 'condensed' (polymeric chains, sheets or networks) or 'isolated' with discrete anionic moieties. Salts containing polyborate anions have attracted recent attention due to their possible applications as luminescent, second harmonic generation, ferroelectric, flame retardant and non-linear optical materials [1]. Isolated polyborate anions are readily synthesised by solvothermic methods [2] or by the addition of B(OH)3 to a basic aqueous solution containing a potential templating cation [3]. Self-assembled products arise since B(OH)3 in basic aqueous solution exists as a dynamic combinatorial library of a number of polyborate anions [4]. In general, pentaborate(1-) salts (containing the [B5O6(OH)4] -anion) are formed because these salts have a strong H-bonded anionic lattice and this lattice is sufficiently flexible to accommodate many small to medium sized cations [5]. Salts containing polyborate anions other than pentaborate(1-) are relatively rare [6]. We are interested in the synthesis of structurally novel polyborate anions and have adopted a strategy of templating such species by the use of sterically demanding and/or highly charged cations [7]. Herein, we report the self-assembly of a salt containing a novel isolated heptaborate(3-) anion, partnered with cationic transition-metal coordination complex. This salt's thermal properties, and its structure as determined by single-crystal XRD are also reported. [8]. Compound 1 was initially characterized by elemental analysis, IR and NMR ( 1 H, 13 C, and 11 B) spectroscopy, and by thermal (TGA/DSC) analysis (air). The thermal and spectroscopic data indicated that 1 was not a pentaborate(1-) salt. In particular, the compound displayed several BO bands in the IR spectra but the diagnostic pentaborate(1-) peak (926 cm -1 ) [9] was absent. At 'infinite' dilution its 11 B NMR spectrum gave a single peak at +12.3 ppm, rather than at +16.1 [5] which would be indicative of pentaborate(1-). This higher field 11 B signal would be more consistent with a lower B/charge ra...

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A New Decaoxidooctaborate(2−) Anion, [B₈O₁₀(OH)₆]^2–: Synthesis and Characterization of [Co(en)₃][B₅O₆(OH)₄][B₈O₁₀(OH)₆)]·5H₂O (en = 1,2-Diaminoethane)

Cited by 38 publications

References 35 publications

Two 1-D Coordination Polymers Containing Zinc(II) Hexaborates: [Zn(en){B6O7(OH)6}]·2H2O (en = 1,2-diaminoethane) and [Zn(pn){B6O7(OH)6}]·1.5H2O (pn = 1,2-diaminopropane)

A new polyborate anion, [B 7 O 9 (OH) 6 ] 3− : Self assembly, XRD and thermal properties of s-fac- [Co(dien) 2 ][B 7 O 9 (OH) 6 ]·9H 2 O

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