Rubidium hydrogen carbonate

Structural formula
General
Surname	Rubidium hydrogen carbonate
Molecular formula	RbHCO 3
Brief description	colorless crystals
External identifiers / databases
CAS number 19088-74-5 EC number 242-805-1 ECHA InfoCard 100,038,898 Wikidata Q2171586
properties
Molar mass	146.48 g · mol -1
Physical state	firmly
Melting point	175 ° C (decomposition)
solubility	good in water: 116 g l −1 (20 ° C) 537.3 g l −1 (100 ° C) bad in ethanol : 20 g l −1
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Rubidium hydrogen carbonate is a rubidium salt of carbonic acid .

Manufacturing

Rubidium hydrogen carbonate can be produced by introducing carbon dioxide into an aqueous solution of rubidium carbonate .

${\displaystyle \mathrm {Rb_{2}CO_{3}+CO_{2}+H_{2}O\longrightarrow 2\ RbHCO_{3}} }$

Another synthesis starts from rubidium hydroxide and dimethyl carbonate and gives the desired product by hydrolysis of the rubidium monomethyl carbonate formed as an intermediate.

${\displaystyle \mathrm {RbOH+(CH_{3})_{2}CO_{3}\longrightarrow Rb(CH_{3})CO_{3}+CH_{3}OH} }$

${\displaystyle \mathrm {Rb(CH_{3})CO_{3}+H_{2}O\longrightarrow RbHCO_{3}+CH_{3}OH} }$

properties

Physical Properties

Rubidium hydrogen carbonate crystallizes in the monoclinic crystal system in the space group C 2 / m (space group no.12 ) with the lattice parameters a = 1473.5 pm, b = 582.02 pm, c = 403.67 pm and β = 104.408 °. In the unit cell there are four  formula units . At room temperature it exists as a dimer ; two hydrogen carbonate ions form a complex anion [H ₂ C ₂ O ₆ ] ²⁻ via a hydrogen bond . At 245  K a phase transition takes place, the low-temperature phase crystallizes in the triclinic crystal system .

Rubidium hydrogen carbonate forms mixed crystals with potassium hydrogen carbonate .

Chemical properties

When heated, rubidium hydrogen carbonate decomposes, releasing carbon dioxide.

${\displaystyle \mathrm {2\ RbHCO_{3}\longrightarrow Rb_{2}CO_{3}+H_{2}O+CO_{2}\uparrow } }$

When a solution of rubidum hydrogen carbonate with rubidium periodate is slowly evaporated, rubidium orthoperiodate is formed.

${\displaystyle \mathrm {RbHCO_{3}+RbIO_{4}+H_{2}O\longrightarrow Rb_{2}H_{3}IO_{6}+CO_{2}\uparrow } }$

Individual evidence

1. ↑ ^{a b c d} Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists. 3. Elements, inorganic compounds and materials, minerals, volume 3. 4th edition, Springer, 1997, ISBN 978-3-5406-0035-0 , pp. 684f. ( limited preview in Google Book search).
2. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. CRC Press, 2009, ISBN 978-1-4200-9084-0 .
3. ↑ There is not yet a harmonized classification for this substance . A labeling of Rubidium hydrogen carbonate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), retrieved on July 29, 2019, is reproduced from a self-classification by the distributor .
4. ↑ ^{a b} R. Abegg, F. Auerbach: "Handbuch der inorganic Chemie". Verlag S. Hirzel, Vol. 2, 1908. P. 435. Full text
5. ↑ ^{a b c} Dissertation: "Contributions to the crystal chemistry of alkali metal carbonates and bicarbonates", Vytas Cirpus, University of Cologne 1997. PDF
6. ↑ GA Webb, CJ Jameson, H. Fukui, K. Kamienska-Trela: "Nuclear Magnetic Resonance", Verlag Royal Society of Chemistry, 2005, ISBN 9780854043521 , p. 311. ( limited preview in Google book search)
7. ^ Moon Il Kim: "The Crystal Structure of Rubidium Hydrogen Carbonate (RbHCO ₃ )" in Journal of the Korean Chemical Society 1969 , 13 (2), pp. 131-136. Abstract
8. ↑ C. Larvor, B. Stöger: The phase transition of rubidium hydrogen carbonate, RbHCO ₃ . In: Acta Crystallographica , E73, 2017, pp. 975-979, doi: 10.1107 / S2056989017008271 .
9. ↑ C. Odin: "Evidence of a phase transition of RbHCO ₃ from high-resolution solid-state ¹³ C and ⁸⁷ Rb NMR by comparison with KHCO _3. " in Magn. Reson. Chem 2004 , 42 (4), pp. 381-388 ( PMID 15022199 ).
10. ↑ R. Müller, G. Roth: "Matrix-free integration of image-plate diffraction data" in J. Appl. Cryst 2005 , 38 , pp. 280-290. doi : 10.1107 / S0021889804034089
11. ^ GV Shilov, ZK Nikitina, Yu. A. Dobrovol'skii, LS Leonova, LO Atovmyan: "Disubstituted Rubidium Orthoperiodate Rb2H3IO6: Crystal and Molecular Structures and Properties" in Russian Journal of Coordination Chemistry 2004 , 30 (7), pp. 449-452. doi : 10.1023 / B: RUCO.0000034783.23782.8d