Fig. 4. (a) Absorption spectra of an Ar-saturated DMA/water (9 : 1 v/v) solution containing trans(Cl)–Ru(bpy)(CO)2Cl2 (0.20 mM), [Ru(bpy)3](PF6)2 (0.50 mM) and BNAH (0.10 M) during photo-irradiation with λ > 400 nm light with an intensity of 7.5 × 10–7 einstein s–1. (b) Absorption spectrum of [Ru(bpy)(CO)2Cl]2 (0.40 mM) in DMA/water (9 : 1 v/v). (c) Absorption spectra of CO2-saturated DMA/water (9 : 1 v/v) solutions containing trans(Cl)–Ru(bpy)(CO)2Cl2 (0.10 mM), [Ru(bpy)3](PF6)2 (0.50 mM) and BNAH (0.10 M) by photo-irradiation with λ > 400 nm light of 7.5 × 10–7 einstein s–1 and (d) 3.8 × 10–8 einstein s–1 (total incident light: 2.3 × 10–4 einstein).
