Preparation And Application Of Metallophthalocyanines

In this thesis, a series of metal (II) phthalocyanines, including single-nuclear cobalt(II) phthalocyanine tetrasulphonates (s-CoPc), bi-nuclear cobalt(II) phthalocyanine hexasulphonates (b-CoPc), tri-nuclear cobalt(II) phthalocyanine octasulphonates (t-CoPc), homo/heterobinuclear metal (II) phthalocyanine hexasulphonates (b-ZnPc, b-MnPc, Co-ZnPc, Co-MnPc, Zn-MnPc), bicarboxyl cobalt phthalocyanine (CobcPc) and five tetracarboxymetallophthalocyanine complexes (FetcPc,CotcPc,NitcPc,CutcPc,ZntcPc), were synthesized and immobilized on nanocrystalline TiO₂ thin films. The UV–Vis spectra of MPc in aqueous and MPc/nanocrystalline TiO₂ thin films were compared, and the adsorption of MPc on the nanocrystalline TiO₂ thin films was investigated. The photocatalytic and catalytic activity of various MPc/nanocrystalline TiO₂ thin films were evaluated by degradation of methylene blue (MB) aqueous solution with air under visible light irradiation and dark condition. The redox behavior of s-CoPc, CobcPc and MtcPc was investigated by cyclic voltammetrym, and the photovoltaic performances of dye-sensitized solar cells (DSCs) with these MPc were measured.The results revealed that various metallophthalocyaninesulphonates can be firmly immobilized on nanocrystalline TiO₂ thin films by sulfonic groups and improve their photocatalytic activity obviously. Under visible light irradiation and dark condition, the photocatalytic and catalytic activity of multinuclear MPc/nanocrystalline TiO₂ thin films were higher than that of single-nuclear MPc/nanocrystalline TiO₂ thin films(t-CoPc > b-CoPc > s-CoPc), homobinuclear MPc/nanocrystalline TiO₂ thin films, especially Co-ZnPc, displayed higher photocatalytic and catalytic activity than homo ones(Co-ZnPc > Co-MnPc > Zn-MnPc > b-ZnPc > b-CoPc > b-MnPc). Moreover, the DSCs with ZntcPc gave relatively higher photoelectric conversion efficiency than others.