To gain insights into the photoinduced processes of prbim-RuPt, the first electron transfer step, which occurs following the absorption of visible light, was investigated by means of ultrafast transient absorption (TA) spectroscopy. To comprehend the role of the catalytic Pt(II) center on the photoinduced processes, we compare the fs-TA data collected for the heterodinuclear complex (prbimRuPt, see Figure - c) with that of the mononuclear counterpart (prbimRu, see Figure ). For both complexes, the TA spectra were collected in acetonitrile upon 400 nm excitation, i.e., in resonance with the tpphz-centered MLCT states (see Section A).