Tetrafluoroberyllate
Names | |
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IUPAC name | |
Systematic IUPAC name
Tetrafluoroberyllate(2−)[5] | |
Other names
Tetrafluoroberyllate[1]
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Identifiers | |
3D model (
JSmol ) |
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ChEBI | |
ChemSpider | |
2035[10] | |
PubChem CID
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UNII | |
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Properties | |
[BeF4]2− | |
Molar mass | 85.0057958 g·mol−1 |
Structure | |
Td | |
tetrahedral
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Related compounds | |
Related
isoelectronic |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tetrafluoroberyllate or orthofluoroberyllate is an
Properties
The Be–F
In the tetrafluoroberyllates, the tetrahedra can rotate to various degrees. At room temperature, they are hindered from moving. But as temperature increases, they can rotate around the threefold axis, (i.e. a line through one fluorine atom and the beryllium atom) with a potential barrier of 12.5 kcal/mol (52 kJ/mol). At higher temperatures, the movement can become
Similar compounds have magnesium or zinc in a similar position as beryllium, e.g. K2[MgF4] (potassium tetrafluoromagnesate) or [NH4]2[ZnF4] (ammonium tetrafluorozincate) but these are not as stable.[12]
Tetrafluoroberyllate has a biological effect by inhibiting
Simple salts
Name | Chemical formula | Molar mass (g/mol) | CAS number
|
Crystal system | Density (g/cm3) | Melting point (°C) | Solubility in water (g/(100 ml)) |
---|---|---|---|---|---|---|---|
lithium tetrafluoroberyllate | Li2[BeF4] | 98.89 | 2.167[14] | 472 °C[15] | slight (1.25 at 20 °C, 5.78 at 40 °C)[16] | ||
sodium tetrafluoroberyllate | Na2BeF4 | 130.985333 | 13871-27-7 | Orthorhombic[17] | 2.47 | 575 °C | slight (1.33 at 0 °C, 1.44 at 20 °C, 2.73 at 90 °C)[18] |
potassium tetrafluoroberyllate | K2BeF4 | 163.20 | 7787-50-0 | orthorhombic a = 5.691 Å, b = 7.278 Å, c = 9.896 Å[19] as for strontium orthosilicate[12] | 2.64[19] | ||
potassium tetrafluoroberyllate dihydrate | K2BeF4·2H2O | 199.233 | |||||
ammonium tetrafluoroberyllate | (NH4)2BeF4 | 121.0827 | 14874-86-3 | orthorhombic a = 5.91 Å, b = 7.64 Å, c = 10.43 Å | 1.71 | decomposes 280 °C[20] | 32.3 at 25 °C[21] |
rubidium tetrafluoroberyllate | Rb2BeF4 | 255.941 | orthorhombic a = 5.87 Å, b = 7.649 Å, c = 10.184 Å[19] | 3.72[19] | |||
caesium tetrafluoroberyllate | Cs2BeF4 | 350.8167 | orthorhomic a = 8.03 Å, b = 10.81 Å, c = 0.622 Å | 4.32 | |||
thallium tetrafluoroberyllate | Tl2BeF4 | 493.7724 | orthorhombic a = 7.7238 Å, b = 5.9022 Å, c = 10.4499 Å[22] | 6.884[22] | |||
silver tetrafluoroberyllate | Ag2BeF4 | 300.7422 | |||||
magnesium tetrafluoroberyllate | MgBeF4 | 109.3108 | |||||
calcium tetrafluoroberyllate | CaBeF4 | 125.08 | 2.959[23] | ||||
strontium tetrafluoroberyllate | SrBeF4 | 172.6 | orthorhombic a = 5.291 Å, b = 6.787 Å, c = 8.307 Å | 3.84 | insoluble | ||
barium tetrafluoroberyllate | BaBeF4 | 222.333 | 4.17[14] | insoluble | |||
radium tetrafluoroberyllate | RaBeF4[24] | 311.005795 | insoluble | ||||
hexaqua ferrous tetrafluoroberyllate | FeBeF4·6H2O[25] | ||||||
heptaqua ferrous tetrafluoroberyllate | FeBeF4·7H2O[23] | 1.894 | |||||
heptaqua nickel tetrafluoroberyllate | NiBeF4·7H2O[23] | ||||||
hexaqua nickel tetrafluoroberyllate | NiBeF4·6H2O[23] | ||||||
heptaqua cobalt tetrafluoroberyllate | CoBeF4·7H2O[23] | 1.867 | |||||
hexaqua cobalt tetrafluoroberyllate | CoBeF4·6H2O[23] | 1.891 | |||||
pentaqua copper tetrafluoroberyllate | CuBeF4·5H2O[23] | ||||||
heptaqua zinc tetrafluoroberyllate | ZnBeFe4·7H2O[23] | ||||||
lead tetrafluoroberyllate | PbBeF4 | 292.2 | 6.135[14] | ||||
hydrazinium tetrafluoroberyllate | N2H6BeF4 | 119.0668 | a = 5.58 Å, b = 7.337 Å, c = 9.928 Å, α = 90°, β = 98.22°, γ = 90°[19] | ||||
triglycine tetrafluoroberyllate | (NH2CH2COOH)3·H2BeF4 | 312.221 | 2396-72-7 | monoclinic[26][27] | |||
ethylene diamine fluoroberyllate | (NH2CH2CH2NH2)·H2BeF4[28] | decomposes 330 °C | |||||
propylenediamine tetrafluoroberyllate | (NH2CH2CH2CH2NH2)·H2BeF4[29] | ||||||
propylene-1,2-diamine tetrafluoroberyllate | (NH2CH(CH3)CH2NH2)·H2BeF4[28] | monoclinic a = 5.535 Å, b = 13.560 Å, c = 9.6048 Å, β = 106.73 Å, V = 690.4 Å3, Z = 4[30] | 1.55 | ||||
benzidine fluoroberyllate | (NH2C6H4C6H4NH2)·H2BeF4[28] | ins | |||||
tetramethyl ammonium tetrafluoroberyllate | [N(CH3)4]2BeF4[14] | ||||||
tetramine silver tetrafluoroberyllate | [Ag(NH3)2]2BeF4[31] | ||||||
[Cu(NH3)2]2BeF4[31] | |||||||
[Cu(NH3)4]2BeF4·H2O[31] | |||||||
[Zn(NH3)4]2BeF4[31] | |||||||
[Cd(NH3)4]2BeF4[31] | |||||||
[Ni(NH3)6]2BeF4[31] | |||||||
[Ni(NH3)4]2BeF4·2H2O[31] | |||||||
[Ni(NH3)2]2BeF4[31] | |||||||
[Co(NH3)6]2BeF4·3H2O[31] |
Sodium tetrafluoroberyllate has several crystalline forms. Below 220 °C it takes the same form as orthorhombic olivine, and this is called γ phase. Between 220 °C and 320 °C it is in the α′ form. When temperature is raised above 320 °C it changes to the hexagonal α form. When cooled the α′ form changes to β form at 110 °C and this can be cooled to 70 °C before changing back to the γ form.[32] It can be formed by melting sodium fluoride and beryllium fluoride.[32] The gas above molten sodium tetrafluoroberyllate contains BeF2 and NaF gas.[11]
Lithium tetrafluoroberyllate takes on the same crystal form as the mineral
Potassium tetrafluoroberyllate has the same structure as anhydrous potassium sulfate, as does rubidium and caesium tetrafluoroberyllate. Potassium tetrafluoroberyllate can make solid solutions with potassium sulfate.[11] It can be used as a starting point to make the non-linear optic crystal KBe2BO3F2 which has the highest power handling capacity and shortest UV performance of any borate.[34] It is quite soluble in water, so beryllium can be extracted from soil in this form.[35]
Ammonium tetrafluoroberyllate decomposes on heating by losing NH4F vapour, progressively forming NH4BeF3, then NH4Be2F5 and finally BeF2.[11]
Thallium tetrafluoroberyllate can be made by dissolving
Radium tetrafluoroberyllate is used as a standard neutron source. The alpha particles from the radium cause neutrons to be emitted from the beryllium. It is precipitated from a radium chloride solution mixed with potassium tetrafluoroberyllate.[12]
Magnesium tetrafluoroberyllate can be precipitated from a hot saturated solution of ammonium tetrafluoroberyllate and a magnesium salt.[11] However, if the temperature reaches boiling point MgF2 is precipitated instead.[36]
Calcium tetrafluoroberyllate resembles zircon in the way it melts and crystallises.[11]
Strontium tetrafluoroberyllate can be made in several forms. The γ form is produced by cooling a melt of SrF2 and Be2 and the β form is made by precipitating from a water solution. When melted and heated to 850–1145 °C, Be2 gas evaporates leaving behind molten SrF2.[11]
The barium tetrafluoroberyllate is very insoluble and can be used for gravimetric analysis of beryllium.[11]
H2BeF4 is an acid that can be produced from Ag2BeF4 and
Triglycine tetrafluoroberyllate (TGFB) is
Double salts
Tuttons salts
The Tuttons salt (NH4)2Mn(BeF4)2·6(H2O) is made from a solution of NH4BeF3 mixed with NH4MnF3.[11] The equivalent of alums are hard to make because the trivalent ion will often form a complex with fluoride in preference to the beryllium fluoride. However the violet coloured acid and rubidium chrome alum exist at chilly temperatures for a few hours.[38]
Tutton's salts (also called schoenites) containing magnesium with fluoroberyllate are difficult to produce, as the solutions tend to precipitate insoluble MgF2.[39]
name | formula | molecular weight | CAS | crystal form | density | melting point | solubility g/100ml |
---|---|---|---|---|---|---|---|
potassium lithium tetrafluoroberyllate | KLiBeF4 | 131.05 | P63, a = 8.781 Å, b = 5.070 Å c = 8.566 Å[40] | ||||
rubidium lithium tetrafluoroberyllate | RbLiBeF4 | 177.41 | P6322, a = 8.980 Å, b = 5.185 Å c = 8.751 Å[40] | ||||
caesium lithium tetrafluoroberyllate | CsLiBeF4 | 224.852 | P21/n, a = 9.328 Å b = 5.356 Å, c = 8.736 Å, γ = 89.82°[40] | ||||
acid chromium fluoroberyllate tetracosihydrate | H2Cr2(BeF4)4·24H2O[38] | 878.40 | |||||
ammonium chromium fluoroberyllate tetracosihydrate | (NH4)2Cr2(BeF4)4·24H2O[38] | 912.46 | |||||
rubidium chromium fluoroberyllate tetracosihydrate | Rb2Cr2(BeF4)4·24H2O[38] | 1047.32 | |||||
manganese ammonium fluoroberyllate hydrate | (NH4)2Mn(BeF4)2·6H2O[39] | 369.118 | 1.758[41] | ||||
Rb2Fe(BeF4)2·6H2O[39] | 504.884 | ||||||
ferrous ammonium fluoroberyllate hydrate | (NH4)2Fe(BeF4)2·6H2O[39] | 370.025[41] | |||||
nickel potassium fluoroberyllate hydrate | K2Ni(BeF4)2·6H2O[39] | 414.913[41] | |||||
nickel rubidium fluoroberyllate hydrate | Rb2Ni(BeF4)2·6H2O[39] | 507.732 | |||||
Cs2Ni(BeF4)2·6H2O[39] | 602.608 | ||||||
nickel ammonium fluoroberyllate hydrate | (NH4)2Ni(BeF4)2·6H2O[39] | 372.874 | P21/a, a = 9.201 Å, b = 12.482 Å, c = 6.142 Å, β = 106.57 Å, V = 676.0 Å3 Z = 2[42] | 1.843[41] | |||
cobalt potassium fluoroberyllate hydrate | K2Co(BeF4)2·6H2O[39] | 415.233[41] | |||||
cobalt rubidium fluoroberyllate hydrate | Rb2Co(BeF4)2·6H2O[39] | 507.972 | |||||
cobalt ammonium fluoroberyllate hydrate | (NH4)2Co(BeF4)2·6H2O[39] | 372.874 | 1.821[41] | ||||
copper rubidium fluoroberyllate hydrate | Rb2Cu(BeF4)2·6H2O[39] | 512.585 | |||||
copper ammonium fluoroberyllate hydrate | (NH4)2Cu(BeF4)2·6H2O[39] | 377.726 | 1.858[41] | ||||
zinc rubidium fluoroberyllate hydrate | Rb2Zn(BeF4)2·6H2O[39] | 514.42 | |||||
zinc ammonium fluoroberyllate hydrate | (NH4)2Zn(BeF4)2·6H2O[39] | 379.56 | 1.859[41] | ||||
cadmium rubidium fluoroberyllate hydrate | Rb2Cd(BeF4)2·6H2O[39] | 561.45 | |||||
cadmium ammonium fluoroberyllate hydrate | (NH4)2Cd(BeF4)2·6H2O[39] | 426.591 |
Alums
Tetrafluoroberyllate salts equivalent to
name | formula | molecular weight | CAS | crystal form | density | melting point | solubility g/100ml |
---|---|---|---|---|---|---|---|
ammonium aluminium tetrafluoroberyllate alum | NH4AlBeF4·12H2O | [43] | |||||
potassium aluminium tetrafluoroberyllate alum | KAlBeF4·12H2O | [43] | |||||
potassium chromium tetrafluoroberyllate alum | KCrBeF4·12H2O | [43] | |||||
ammonium chromium tetrafluoroberyllate alum | NH4CrBeF4·12H2O | cubic a = 12.218 Å, Z = 4[43] | |||||
rubidium chromium tetrafluoroberyllate alum | RbCrBeF4·12H2O | 12.214 Å[43] | |||||
caesium chromium tetrafluoroberyllate alum | CsCrBeF4·12H2O | 12.323 Å[43] | |||||
thallium chromium tetrafluoroberyllate alum | TlCrBeF4·12H2O | 12.195 Å[43] | |||||
rubidium iron tetrafluoroberyllate alum | RbFeBeF4·12H2O | [43] | |||||
caesium iron tetrafluoroberyllate alum | CsFeBeF4·12H2O | [43] | |||||
monomethyl chromium tetrafluoroberyllate alum | CH3NH3CrBeF4·12H2O | 12.496 Å[44] | |||||
guanidium chromium tetrafluoroberyllate alum | C(NH2)3CrBeF4·12H2O | 12.538 Å[44] | on heating forms a rhombohedral hexahydrate stable from 30 °C to 90 °C |
References
- ^ "Beryllium tetrafluoride". pubchem.ncbi.nlm.nih.gov. Retrieved 30 January 2019.
Depositor-Supplied Synonyms beryllium tetrafluoride Tetrafluoroberyllate
- ^ "tetrafluoroberyllate(2−) (CHEBI:30497)" (table). www.ebi.ac.uk. 26 January 2009. Retrieved 30 January 2019.
Synonyms Sources tetrafluoroberyllate(2−) IUPAC
- ^ "Tetrafluoroberyllate(2−)". www.chemspider.com. p. Names. Retrieved 30 January 2019.
Tetrafluoroberyllate(2-) [ACD/IUPAC Name]
- ^ "tetrafluoroberyllate(2−) (CHEBI:30497)". www.ebi.ac.uk. 26 January 2009. Retrieved 30 January 2019.
IUPAC Name tetrafluoridoberyllate(2−)
- ^ "Tetrafluoroberyllate(2−)". www.chemspider.com. p. More details. Retrieved 30 January 2019.
Systematic name Tetrafluoroberyllate(2−)
- ^ "Tetrafluoroberyllate(2−)". www.chemspider.com. p. Data Sources. Retrieved 30 January 2019.
30497
- ^ "tetrafluoroberyllate(2-) (CHEBI:30497)". www.ebi.ac.uk. 26 January 2009. Retrieved 30 January 2019.
ChEBI ID CHEBI:30497
- ^ "Tetrafluoroberyllate(2−)". www.chemspider.com. p. More details. Retrieved 30 January 2019.
SMILES [Be-2](F)(F)(F)F
- ^ "tetrafluoroberyllate(2−) (CHEBI:30497)" (table). www.ebi.ac.uk. 26 January 2009. Retrieved 30 January 2019.
SMILES F[Be--](F)(F)F
- ^ "tetrafluoroberyllate(2−) (CHEBI:30497)" (table). www.ebi.ac.uk. 26 January 2009. Retrieved 30 January 2019.
Registry Number Type Source 2035 Gmelin Registry Number Gmelin
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- )
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- JSTOR 44109476.
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- ^ Sastri, Malladi Narasimha (1958). Radiochemical measurements on neutron sources (PDF) (Thesis). Durham University. pp. 18–20.
- ^ Kaduk, J. A. (2019). "Section 4.9.4. Chemical reasonableness". In Gilmore, C. J.; Kaduk, J. A.; Schenk, H. (eds.). International Tables for Crystallography Volume H Powder diffraction. pp. 496–508.
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- ^ a b Lari-Lavassani, Abbasse; Avinens, Christian; Cot, Louis (15 June 1970). "Sur l'existence et la cristallographie de quelques nouveaux fluorobéryllates doubles de chrome [CH3NH3]Cr(BeF4)2·12H2O, [C(NH2)3]Cr(BeF4)2·12H2O et [C(NH2)3]Cr(BeF4)2·6H2O" [On the existence and crystallography of several new double chrome fluoroberyllates [CH3NH3]Cr(BeF4)2·12H2O, [C(NH2)3]Cr(BeF4)2·12H2O and [C(NH2)3]Cr(BeF4)2·6H2O]. Comptes rendus hebdomadaires des séances de l'Académie des sciences (in French). C270. Paris: 1973–1975.