Nitrosylruthenium nitrato complexes in aqueous nitric acid

Addressing Ruthenium Speciation in Tri-n-butyl-phosphate Solvent Extraction Process by Fourier Transform Infrared, Extended X-ray Absorption Fine Structure, and Single Crystal X-ray Diffraction

“…Dissolution of fuels in nitric acid leads to the formation of aqueous pseudo-octahedral nitrosyl ruthenium complexes, 1,6,7 written under the form [RuNO(NO 3 ) x (NO 2 ) y (OH) z -(H 2 O) t ] (3-x-y-z)+ (x, y, z, and t coefficients are such that x + y + z + t = 5 and depend on pH and nitrates and/or nitrite concentrations). 2,3,8,9 Most of the aqueous Ru(IV) ions produced during the dissolution are quickly converted into RuNO 3+ species, which are highly stable in nitric solutions.…”

“…Dissolution of fuels in nitric acid leads to the formation of aqueous pseudo-octahedral nitrosyl ruthenium complexes, ,, written under the form [RuNO­(NO 3 ) x ­(NO 2 ) y (OH) z ­(H 2 O) t ] (3‑ x ‑ y ‑ z )+ ( x , y , z , and t coefficients are such that x + y + z + t = 5 and depend on pH and nitrates and/or nitrite concentrations). ,,, Most of the aqueous Ru­(IV) ions produced during the dissolution are quickly converted into RuNO 3+ species, which are highly stable in nitric solutions. Exchanges occur between the various species, and the slow kinetics of their equilibria have been characterized. , The groups in nitrosyl trans position (presented as 5 in Figure ) have been described as more labile ,, than others, because of the high trans effect of the nitrosyl ligand.…”

A theoretical investigation on the intermolecular potential curve between ruthenium tetroxide and NOX (X = 1, 2)

“…In the liquid waste, the ruthenium forms an octahedral nitrosyl complex with nitrito, nitrato, hydroxyl, and aqua ligands [10–17]. The nitrosyl ligand settles in the axial position and the position and number of other ligands depend on the concentration of nitric acid.…”

Experimental findings on actinide recovery utilizing oxidation by peroxydisulfate followed by ion exchange: Fuel cycle research & development

“…Consequently, the chemistry of ruthenium has been studied to understand the fate of ruthenium during reprocessing of irradiated nuclear fuels. For example, Fletcher, et al reported the formation of cationic, neutral, and anionic complexes of rutheniumnitrosyl, in which ruthenium is present as Ru II 11. Wallace reported on the extraction and ion-exchange characteristics of several nitrato nitrosylruthenium II complexes including the neutral trisnitratonitrosylruthenium II , (O 3 N) 3 Ru(NO)(H 2 O) 2 .…”