Photoinduced electron transfer of platinum(ii) bipyridine diacetylides linked by triphenylamine- and naphthaleneimide-derivatives and their application to photoelectric conversion systemsElectronic supplementary information (ESI) available: Synthetic methods for compounds 8, 9, and 12, UV-visible and phosphorescence spectra of 3 (Fig. S1), redox potentials of 3 and 5 (Table S1), energy diagrams of 3 (Fig. S2) and 5 (Fig. S3), nanosecond laser flash photolyses of 3 (Fig. S4) and 12 (Fig. S5), the

The recently reported efficient charge-separated system based on bipyridinediacetylide platinum( ii ) complexes was applied to photoelectric conversion systems herein, based on the design and synthesis of two triads: MTAPtNDISAc ( 3 , MTA: dimethoxytriphenylamine, Pt: platinum( ii ) complex, NDISAc: thioacetate derivative linked to naphthalenediimide) and MTAPtMNICOOH ( 4 , MNICOOH: naphthaleneimide-4-carboxylic acid). The charge-separated (CS) states of triads 3 and 5 (MOM-protected 4 ) were effectively generated by photo-induced electron transfer in both THF and toluene, although the rate of formation of the CS state from 5 was relatively slow in toluene. The lifetimes of these CS states were determined to be 730 ns in toluene and 61 ns (70%) and 170 ns (30%) as a double exponential decay in THF for 3 , and 600 ns in toluene and 170 ns in THF for 5 . The acetylthio group of triad 3 was exploited in the preparation of a self-assembled monolayer (SAM) on a gold surface. Photocurrent was detected upon irradiation of an electrochemical cell comprising Au/ 3 /Na ascorbate/Pt, which was ascribed to the platinum( ii ) complex based on the action spectrum. The carboxylic acid group of triad 4 facilitated adsorption on the TiO 2 surface, and a dye-sensitized solar cell constructed based on FTO/TiO 2 / 4 /electrolyte (LiII 2 )/Pt exhibited a poor energy conversion efficiency ( = 0.20%) based on the incident photon-to-current conversion efficiency spectrum and the I V curve. This poor efficiency may be derived from the bent molecular shape of 4 , or may be due to a possible high energy barrier in the electron injection process through the adsorption site. The efficient charge-separated systems (DPtA) were applied to photoelectric conversion devices.