The Crystal Structures of Rubidium and Ammonium Fluoborates

Hoard, J. L.; Blair, Virginia

doi:10.1021/ja01313a067

Cited by 45 publications

(6 citation statements)

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“…In fact, the fluoroborate ions are fairly common in solid-state compounds. RbBF 4 , NH 4 BF 4 , and BaBOF 3 were known to have B−F bonds in the fluoroborate ions. There are also some other solid-state compounds, such as Ln 3 (BO 3 ) 2 F 3 and Zn 2 (BO 3 )(OH) 0.75 F 0.25 , which contain isolated fluorine anions.…”

Section: Resultsmentioning

confidence: 99%

Bismuth Borates: One-Dimensional Borate Chains and Nonlinear Optical Properties

Wang

et al. 2005

Chem. Mater.

150

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Three bismuth borates, Bi[B4O6(OH)2]OH (I), BiB2O4F (II), and Bi3[B6O13(OH)] (III), were obtained in boric acid flux at low temperatures and their structures were determined by using single-crystal and powder X-ray diffraction techniques. All these three bismuth borates contain one-dimensional borate chains and crystallize in noncentrosymmetric space groups. I is a hydrated borate, crystallizing in the space group P1 with lattice constants a = 4.300(1) Å, b = 8.587(2) Å, c = 10.518(2) Å, α = 113.11(3)°, β = 100.50(3)°, and γ = 90.36(3)°, and the borate chain consists of a 3-ring (2BO3 + BO4) and a BO3 group. II is a fluoroborate, which crystallizes in the trigonal space group P32 with a = 6.7147(1) Å and c = 6.4688(1) Å, and the borate anion is a 3-fold helix chain formed by extensive linkage of three-membered borate rings (3BO4). III is also a hydrated borate with a structure that is closely related to II, in which one-sixth of the borate groups are in triangular geometry (BO3), which reduces the symmetry to P1, a = 6.6257(1) Å, b =6.6238(1) Å, c = 6.6541(1) Å, and α = 89.998(3)°, β = 89.982(2)°, and γ = 119.992(2)°. All these three bismuth borates exhibit nonlinear optical (NLO) properties.

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Section: Resultsmentioning

confidence: 99%

Bismuth Borates: One-Dimensional Borate Chains and Nonlinear Optical Properties

Wang

et al. 2005

Chem. Mater.

150

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“…Interestingly, the alkali metal and ammonium tetrafluoborates have been found to exist in an orthorhombic phase at room temperature (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15), and in a cubic phase at high temperatures (16)(17)(18). In addition, a modification of the orthorhombic phase of NH,BF, has been observed at low iemperatures (17, 1'9).…”

Section: Introductionmentioning

confidence: 99%

“…Crystal structures for the orthorhombic phase have been determined for the sodium (4,15,42,43), potassium (7), rubidium (9), and ammonium (9) salts. The structure determinations of KBF,, NH,BF,, and RbBF, are inaccurate by present standards.…”

Section: Introductionmentioning

confidence: 99%

Crystal structures of potassium, ammonium, rubidium, and cesium tetrafluoborates

Clark¹,

Lynton²

1969

Can. J. Chem.

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The crystal structures of potassium, ammonium, and rubidium tetrafluoborates have been redetermined. The structure of cesium tetrafluoborate has also been established. These 4 compounds are isomorphous and show orthorhombic symmetry, space group Pbnm. Atomic parameters have been obtained from a block diagonal least squares refinement using anisotropic temperature parameters. The final agreement residuals for observed reflections were KBF4, R = 0.072; NH4BF4, R = 0.075; RbBF4, R = 0.064; and CsBF4, R = 0.051.There are significant differences between some of the B-F bond distances in the [BF4]-ions. The shortest N---(H)F distance in NH4BF4 is 2.914 A (estimated standard deviation 0.005 A) which is long for a hydrogen bond. The positions of the hydrogen atoms in the NH4+ ion could not be established.

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“…No isolated BO 4 groups have been found in monovalent metal borates. Isolated BF 4 tetrahedra are known only in the structures of fluoroborates NaBF 4 and NH 4 BF 4 with N = 1 [66,67]. The maximal fraction of BO 4 -tetrahedra (n = 1) is found in the framework lithium (Li 2 O•2B 2 O 3 ) and potassium (K 2 O•2B 2 O 3 ) borate structures with N = 1/2 but 1/n = 3/5 [10,14], and in cesium borate Cs 2 O•3B 2 O 3 it is even smaller (1/n = 1/2) and shifts to N = 1/3 [12].…”

Section: Polymerization Of Boron-oxygen Radicalsmentioning

confidence: 99%

Crystal Chemistry of High-Temperature Borates

2020

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In recent years borate-based crystals has attracted substantial interest among the research community. The overall importance of this family of materials is reflected in miscellaneous articles and several reviews that have been published over the years. Crystalline borate materials exhibit numerous interesting physical properties, which make them promising for further practical applications. Diversity of functional characteristics results from their high structural flexibility caused in the linkage of planar/non–planar BO3 groups and BO4 tetrahedra, which can occur as isolated or condensed structural units. This report is a brief review on crystal chemistry and structure features of anhydrous/high-temperature borates. Polymorphism of boron-oxygen radicals has been considered basing on cations’ nature and synthesis conditions. Analysis of the laws governing borates structures and general principles of their systematics was discussed. As a result, an alternative classification of anhydrous compounds has been considered. It is based on four orders of their subdivision: (1) by the variety of anion formers, (2) by the cation charge, (3) by the N = NM:NB, i.e., ratio of metal atoms number to the ratio of boron atoms number (N-factor) value indicating the borate structural type (if it is known), (4) by the cation type and size.

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The Crystal Structures of Rubidium and Ammonium Fluoborates

Cited by 45 publications

References 0 publications

Bismuth Borates: One-Dimensional Borate Chains and Nonlinear Optical Properties

Bismuth Borates: One-Dimensional Borate Chains and Nonlinear Optical Properties

Crystal structures of potassium, ammonium, rubidium, and cesium tetrafluoborates

Crystal Chemistry of High-Temperature Borates

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