2026/06/01 by D. L. Galkin, D.L. Galkin, G. A. Kostin +1
Biochemistry, Genetics and Molecular Biology · Chemistry · Medicine · #Electron Spin Resonance Studies #Metal complexes synthesis and properties #Metal-Catalyzed Oxygenation Mechanisms
paper · doi:10.1134/s0036023626600991
crossref issued 2026/06/01 · crossref published 2026/06/01 · crossref published-print 2026/06/01 · openalex publication_date 2026/06/01 · crossref published-online 2026/07/28 · crossref created 2026/07/28 · openalex created_date 2026/07/29 · openalex updated_date 2026/07/30 · crossref deposited 2026/07/31 · crossref indexed 2026/07/31
Abstract It is shown that diammine–nitrate complexes of nitrosylruthenium [RuNO(NH3)2(NO3)3] undergo rapid aquation in acidic aqueous solutions yielding [RuNO(NH3)2(H2O)3]3+ cations. The acid dissociation processes of the mer/fac-[RuNO(NH3)2(H2O)3]3+ were studied by potentiometric titration and IR spectroscopy. The dissociation constants (pKa1,2,3 = 1.29, 3.65, 7.12 and 2.29, 5.06, 7.1 for the mer- and fac-isomers, respectively) and the thermodynamic parameters (ΔH°, ΔS°) of the dissociation processes were determined. The greatest difference in the dissociation process is observed for the second step (pKa2) due to differences in the coordination of water molecules. IR spectroscopy confirmed that the first dissociation step in both isomers corresponds to the deprotonation of the aqua ligand coordinated in the trans position to the nitrosyl group.