Full text to the above-mentioned article:
Synthesis, Electrochemistry, and Reactivities of trans-[Ru(L)O2]2+ (L = N,N'-dimethyl-N,N'-bis(2-pyridylmethyl)propylenediamine
Chi-Ming Che, Wai-Tong Tang, and Chi-Keung Li
J. Chem. Soc. Dalton Trans 3735-3739 (1990) (https://www.thevespiary.org/rhodium/Rhodium/pdf/thf2gbl.ruo2l2.pdf)
(https://www.thevespiary.org/rhodium/Rhodium/pdf/thf2gbl.ruo2l2.pdf)
Abstract
The synthesis and characterization of the ligand N,N'-dimethyl-N,N'-bis(2-pyridylmethyl)propylenediamine (L) and the complex trans-[Ru(L)O2]2+ are described. The complex has been characterized by uv-visible [dxy ? d?* (d?* = dxz,dyz) at 380-420 nm] and IR [Vasym(RuO2) at 860 cm-1] spectroscopy. At pH 1.0 it exhibits three reversible couples RuVI-RuIV RuIV-RuIII, and RuIII-RuII at potentials of 0.89, 0.60, and 0.28 V respectively vs. saturated calomel electrode. The RuVI-RuIV couple splits into two reversible one-electron couples RuVI-RuV and RuV-RuIV in alkaline solutions (pH > 9). The complex is a powerful oxidant, capable of oxidizing toluene to benzaldehyde, alcohols to aldehydes/ketones, tetrahydrofuran to ?-butyrolactone, and norbornene to exo-2,3-epoxy-norbornane in high yields at room temperature. Oxidation of cis- and trans-stilbenes gave benzaldehyde and trans-stilbene oxides.