Black Roussin ammonium salt

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Structural formula
Structure of the ammonium ion Structure of the heptanitrosyltrithiotetraferrate anion
General
Surname Black Roussin ammonium salt
other names

Ammonium heptanitrosyl tri-μ 3 -thiotetraferrate

Molecular formula NH 4 [Fe 4 S 3 (NO) 7 ]
External identifiers / databases
CAS number
  • 54724-04-8
  • 53323-02-7 (monohydrate)
Wikidata Q61450158
properties
Molar mass 565.71 g mol −1
Physical state

firmly

safety instructions
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 .

Black Roussin's ammonium salt (after the French chemist François-Zacharie Roussin ) is a complex salt with the formula NH 4 [Fe 4 S 3 (NO) 7 ]. It is classified as a metal nitrosyl compound. It consists of the ammonium cation and the [Fe 4 S 3 (NO) 7 ] - - anion . The geometry of the anion cluster is an incomplete cube. The point group symmetry of the anion is C 3v . Other salts exist with the anion, such as the black Roussin sodium salt or the black Roussin iron salt .

Extraction and presentation

Black Roussin's salt is produced by passing nitrogen monoxide through a suspension of iron (II) sulfide in dilute alkali metal sulfide solution. It can also be formed from Roussin's red salt under mildly acidic conditions. This reaction is reversible and Roussin's red salt is formed back by alkalizing the reaction solution.

properties

The anion is structurally related to the iron-sulfur cluster , which occurs in various enzymes such as nitrogenase .

The monohydrate NH 4 [Fe 4 S 3 (NO) 7 ] × H 2 O crystallizes in the triclinic crystal system in the space group P 1 (space group no. 2) with the lattice parameters a  = 944  pm , b  = 994 pm, c  = 566 pm, α  = 117.2 °, β  = 101.3 ° and γ  = 101.1 ° as well as two formula units per unit cell . Template: room group / 2

use

Black Roussin's ammonium salt is a nitric oxide donor. The nitric oxide introduced by Black Roussin's salt has been shown to be toxic to some melanomas and tumor cells . Black Roussin's salt also has an antibacterial (disinfectant) effect, which z. B. is exploited in the food industry.

literature

Individual evidence

  1. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
  2. ↑ External identifiers of or database links to Black Roussin's sodium salt : CAS number: 12518-87-5, Wikidata : Q2254194 .
  3. ↑ Entry on Roussin's salts. In: Römpp Online . Georg Thieme Verlag, accessed on June 15, 2014.
  4. ↑ External identifiers of or database links to Roussin's red potassium salt : CAS number: 58204-17-4, Wikidata : Q7371347 .
  5. ↑ LL Martin, GD Fallon and B. Wu: Ammonium heptanitrosyltrithiotetraferrate monohydrate . In: Acta Cryst., 2004, 60, 3, pp. 37-39, doi : 10.1107 / S1600536804002338 .
  6. ↑ Agnieszka Janczyk, Agnieszka Wolnicka-Glubisz, Antonina Chmura, Martyna Elas, Zenon Matuszak, Grazyna Stochel, Krystyna Urbanska: NO-dependent phototoxicity of Roussin's black salt against cancer cells. In: Nitric Oxide . 2004, 10, 1, pp. 42-50, doi : 10.1016 / j.niox.2004.01.009 .