Rubidium permanganate

Crystal structure
	__ Rb + __ O 2− __ Mn 7+
Crystal system	orthorhombic
Space group	Pnma (No. 62)
Lattice parameters	a = 954.11 pm, b = 573.926 pm, c = 763.63 pm
General
Surname	Rubidium permanganate
other names	Rubidium tetraoxomanganate (VII); Rubidium manganate (VII); Super manganese acid rubidium;
Ratio formula	RbMnO 4
Brief description	purple needle- / octahedral crystals
External identifiers / databases
PubChem	23674440
ChemSpider	13389592
Wikidata	Q2171598
properties
Molar mass	204.404 g mol −1
Physical state	firmly
density	3.325 g cm −3
Melting point	295 ° C (decomposition)
solubility	slightly soluble in water (10.6 g l −1 at 19 ° C)
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Rubidium permanganate is the rubidium salt of permanganic acid , HMnO _{4, which is} unknown in the free state . The manganese is in its highest oxidation state + VII.

Manufacturing

Rubidium permanganate can be made from potassium permanganate and rubidium chloride.

{\ displaystyle {\ ce {RbCl + KMnO4 -> KCl + RbMnO4 v}}}

properties

Physical Properties

Rubidium permanganate is not very soluble in water, the solubility increases with increasing temperature. At 7 ° C, 1 liter of the saturated solution contains 6.03 g, at 19 ° C 10.6 g and at 60 ° C 46.8 g. It crystallizes in the orthorhombic crystal system in the space group Pnma (space group no. 62) with the lattice parameters a = 954.1 pm , b = 573.9 pm and c = 763.6 pm. In the unit cell contains four formula units . The crystals are isomorphic to cesium permanganate , ammonium permanganate and potassium permanganate . Template: room group / 62

Chemical properties

Like potassium permanganate, rubidium permanganate decomposes in two stages, with rubidium manganate (VI) being formed as an intermediate . Manganese (IV) oxide , rubidium oxide and elemental oxygen are formed as further decomposition products . The decomposition takes place between 200 and 300 ° C. The mass loss due to the evolution of oxygen is 8.0%.

{\ displaystyle {\ ce {10RbMnO4 -> 3Rb2MnO4 + 7MnO2 + 2Rb2O + 6O2 ^}}}

{\ displaystyle {\ ce {2Rb2MnO4 -> 2MnO2 + 2Rb2O + O2}}}

use

In qualitative analysis , rubidium permanganate is used as a reagent for the detection of perchlorate ions. It is produced as an intermediate from rubidium nitrate and potassium permanganate and, with the presence of perchlorate ions, precipitates as RbClO ₄ · RbMnO ₄ mixed crystal.

Individual evidence

↑ ^a ^b R. Hoppe, D. Fischer, J. Schneider: On the knowledge of oxides A [MO ₄ ]: About LiMnO ₄ , KMnO ₄ , RbMnO ₄ , CsMnO ₄ and RbIO ₄ and CsIO ₄ . (- What does “the crystal structure of ...” actually mean? -) . In: Journal of Inorganic and General Chemistry . tape 625 , no. 7 , 1999, p. 1521-3749 , doi : 10.1002 / (SICI) 1521-3749 (199907) 625: 7 <1135 :: AID-ZAAC1135> 3.0.CO; 2-L .
↑ ^a ^b ^c Dale L. Perry, Sidney L. Phillips: Handbook of inorganic compounds . CRC Press, 1995, ISBN 978-0-8493-8671-8 , p. 336 ( limited preview in Google book search).
↑ ^a ^b Aterton Seidell: Solubilities of Organic Compounds . tape 1 , 1940, p. 1438 ( full text ).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ ^a ^b Michael W. Beck, Michael E. Brown: Thermal analysis of antimony / potassium permanganate pyrotechnic compositions . In: Thermochimica Acta . tape 65 , no. 2-3 , 1983, pp. 197–212 , doi : 10.1016 / 0040-6031 (83) 80022-7 ( PDF ( memento of October 29, 2013 in the Internet Archive )).
^ PJ Herley, EG Prout: The Thermal Decomposition of Rubidium Permanganate . In: The Journal of Physical Chemistry . tape 64 , no. 5 , 1960, pp. 675-677 , doi : 10.1021 / j100834a503 .
^ Austin M. Patterson: Solubilities of Permanganates of the Alkali Metals . In: Journal of the American Chemical Society . tape 28 , no. 12 , 1906, pp. 1734–1736 , doi : 10.1021 / ja01978a009 .
↑ ^a ^b Z. Gontarz, B. Pisarska: Thermal decomposition stages of potassium, rubidium and cesium permanganates . In: Journal of Thermal Analysis and Calorimetry . tape 6 , no. 6 , September 1990, pp. 2113-2117 , doi : 10.1007 / BF01914135 .
↑ E. Gerdes: Qualitative inorganic analysis . A companion for theory and practice. 2nd Edition. Springer, 2001, ISBN 978-3-540-67875-5 , pp. 139 ( limited preview in Google Book search).

[Hoppe-1] R. Hoppe, D. Fischer, J. Schneider: On the knowledge of oxides A [MO ₄ ]: About LiMnO ₄ , KMnO ₄ , RbMnO ₄ , CsMnO ₄ and RbIO ₄ and CsIO ₄ . (- What does “the crystal structure of ...” actually mean? -) . In: Journal of Inorganic and General Chemistry . tape 625 , no. 7 , 1999, p. 1521-3749 , doi : 10.1002 / (SICI) 1521-3749 (199907) 625: 7 <1135 :: AID-ZAAC1135> 3.0.CO; 2-L .

[Perry-2] Dale L. Perry, Sidney L. Phillips: Handbook of inorganic compounds . CRC Press, 1995, ISBN 978-0-8493-8671-8 , p. 336 ( limited preview in Google book search).

[Seidell-3] Aterton Seidell: Solubilities of Organic Compounds . tape 1 , 1940, p. 1438 ( full text ).

[NV-4] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Beck-5] Michael W. Beck, Michael E. Brown: Thermal analysis of antimony / potassium permanganate pyrotechnic compositions . In: Thermochimica Acta . tape 65 , no. 2-3 , 1983, pp. 197–212 , doi : 10.1016 / 0040-6031 (83) 80022-7 ( PDF ( memento of October 29, 2013 in the Internet Archive )).

[Herley-6] PJ Herley, EG Prout: The Thermal Decomposition of Rubidium Permanganate . In: The Journal of Physical Chemistry . tape 64 , no. 5 , 1960, pp. 675-677 , doi : 10.1021 / j100834a503 .

[Patterson-7] Austin M. Patterson: Solubilities of Permanganates of the Alkali Metals . In: Journal of the American Chemical Society . tape 28 , no. 12 , 1906, pp. 1734–1736 , doi : 10.1021 / ja01978a009 .

[Gontarz-8] Z. Gontarz, B. Pisarska: Thermal decomposition stages of potassium, rubidium and cesium permanganates . In: Journal of Thermal Analysis and Calorimetry . tape 6 , no. 6 , September 1990, pp. 2113-2117 , doi : 10.1007 / BF01914135 .

[Gerdes-9] E. Gerdes: Qualitative inorganic analysis . A companion for theory and practice. 2nd Edition. Springer, 2001, ISBN 978-3-540-67875-5 , pp. 139 ( limited preview in Google Book search).