Photophysical properties and photo-induced intermolecular electron transfer of a novel aryl benzyl ester dendritic axially-substituted silicon (Ⅳ) phthalocyanine

摘要

The photophysical properties of a novel dendritic phthalocyanine di-{3,5-di-(4-methoxycarbonyl group benzyloxy) benzyloxy) benzyloxy} axially substituted silicon (Ⅳ) phthalocyanine (DSiPc) were studied by UV/Vis, steady state and time-resolved spectroscopic methods. The effect of dendritic structure on the photophysical properties and photoinduced intermolecular electron transfer were investigated. The maximum absorption, fluorescence intensity, lifetime and fluorescence quantum yield of DSiPc were greatly sensitized by the dendritic structure on the axially position of silicon (Ⅳ) phthalocyanine. The photoinduced intermolecular electron transfer between this novel macromolecule and benzoquinone (BQ) was studied. The results showed that the fluorescence emission of this dendritic phthalocyanine could be quenched by BQ with K_(sv) value of DSiPc is 52.84 dm~3 mol~(-1). The cyclic voltammogram and square wave voltammogram of DSiPc in DMF further evidenced the electron was transfer from DSiPc to BQ from thermodynamics. Therefore, this novel dendritic phthalocyanine was an effective new electron donor and transmission complex could be used as a potential artificial photosynthesis system.