79747-03-8Relevant academic research and scientific papers
Ground- and excited-state electron-transfer reactions: Photoinduced redox reactions of poly(pyridine)ruthenium(II) complexes and cobalt(III) cage compounds
Mok, Chup-Yew,Zanella, Andrew W.,Creutz, Carol,Sutin, Norman
, p. 2891 - 2897 (2008/10/08)
Rate constants for the quenching of poly(pyridine)ruthenium(II) (RuL32+) excited states by caged cobalt(III) amine complexes (Co(cage)3+) range from 2 × 108 to 1 × 109 M-1 s-1 at 25°C. The quenching process involves parallel energy transfer (ken ～ 1 × 108 M-1 s-1) and electron transfer (kel = (0.1-1) × 109 M-1 s-1) from *RuL32+ to Co(cage)3+. The rate constants for electron-transfer quenching are consistent with expectations based on an adiabatic semiclassical model. The yields of electron-transfer products range from 0.3 to 1.0, increasing as the rate constants for the back-reaction of RuL33+ with Co(cage)2+ diminish. The relatively low magnitudes of the back-reaction rate constants, (0.08-8) × 108 M-1 s-1, are consistent with the high yields of electron-transfer products and derive from poor coupling of the RuL33+ and Co(cage)2+ orbitals.
