Synthesis and Photoinduced Intramolecular Processes of Light-Harvesting Sili...

 

 

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Synthesis and Photoinduced Intramolecular Processes of Light-Harvesting Silicon Phthalocyanine-Naphthalenediimide-Fullerene Connected Systems

przez Chemistry - A European Journal autor: Mohamed E. El-Khouly, Jung Hoon Kim, Kwang-Yol Kay, Chan Soo Choi, Osamu Ito, Shunichi Fukuzumi dnia 09-04-03

Photoinduced intramolecular processes of a newly synthesized pentad composed of silicon phthalocyanine (SiPc) that is connected with two units of naphthalenediimide (NDI) and fullerene C60 to form SiPc-(NDI)2-(C60)2 have been studied and the results are compared with the reference compounds, namely, the SiPc-(NDI)2 triad and NDI-C60 dyad. Upon photoexcitation, the main quenching pathway in polar solvents involved electron transfer via the singlet excited states of SiPc-(NDI)2-(C60)2 and SiPc-(NDI)2, but not NDI-C60 for which the energy transfer is dominant. The occurrence of electron-transfer processes of SiPc-(NDI)2-(C60)2 and SiPc-(NDI)2 were studied by time-resolved emission and transient absorption techniques and confirmed by redox measurements and molecular orbital calculations with ab initio B3 LYP/3-21G(*) methods. Fast and efficient charge-separation processes via the singlet excited states of NDI and SiPc were monitored, followed by charge recombination to populate the C60 and SiPc triplet states. The lifetimes of charge-separated states were estimated as 1000 and 250 ps for SiPc-(NDI)2-(C60)2 and SiPc-(NDI)2, respectively.

 

 

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