cis-Aquachlorobis(ethane-1,2-diamine)ruthenium(III) trifluoromethanesulfonate: Crystal structure and hydrolysis kinetics

Abstract

The pale yellow ruthenium(III) complex cis-[Ru(H₂NCH₂CH₂NH₂)₂(OH₂)Cl] (CF₃S0₃)₂.H₂O crystallized in the space group P1, a 11.661(2), b 9.961(2), c 9.130(2) Å, α 78.83(3), β70.42(2), γ 85.29(2)º, Z 2. The Ru-N, Ru-Cl and Ru-O bond distances in the essentially octahedral ion are 2.10 (average), 2.323(1) and 2.093(2) Å respectively. The complex hydrolyses with retention of configuration in aqueous acid (0.01 M HOSO₂CF₃, k_aq 2.70 x 10^-5S^-1 at 25ºC, ∆H ? 90.6(± 1.5) kJ mol^-1, ∆S ?-28 (± 5) 5 K^-1 mol^-1) and base (0.01 M NaOH, k_oh 0.44 mol^-1 1. s^-1 at 25ºC, ∆H^‡ 73.5(± 2.0) kJ mol^-1, ∆^S‡-43(± 7) JK-1 mol^-1).