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Pentamminechlororhodium dichloride is the dichloride salt of the coordination complex [RhCl(NH3)5]. It is a yellow, water-soluble solid. The salt is an intermediate in the purification of rhodium from its ores.
As shown by X-ray crystallography, the salt consists of the octahedral complex [RhCl(NH3)5] and two chloride counterions. It forms from the reaction of rhodium trichloride and ammonia in ethanol. Two chloride anions are labile, whereas the coordinated chloride ligand is not.
Treatment of [RhCl(NH3)5]Cl2 with zinc dust in the presence of ammonia gives the hydride complex .
Hambley, Trevor W.; Lay, Peter A. (1986). "Comparisons of pi-Bonding and Hydrogen Bonding in Isomorphous Compounds: Cl2 (M = Cr, Co, Rh, Ir, Ru, Os)". Inorganic Chemistry. 25 (25): 4553–4558. doi:10.1021/ic00245a020.
^ Osborn, J. A.; Thomas, K.; Wilkinson, G. (1972). "Pentaamminechlororhodium(III) Dichloride and Pentaamminehydridorhodium(III) Sulfate". Inorganic Syntheses. Vol. 13. pp. 213–215. doi:10.1002/9780470132449.ch43. ISBN978-0-470-13172-5.
Thomas, K.; Osborn, J. A.; Powell, A. R.; Wilkinson, G. (1968). "The Preparation of Hydridopentammine- and Hydridoaquotetramminerhodium(III) Sulphates and Other Salts; the Formation of Alkyl and Fluoroalkyl Derivatives". Journal of the Chemical Society A: 1801. doi:10.1039/j19680001801.