Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles
The syntheses of zinc(II) tetra–[3–(4–phenoxy) (propanoic acid) phthalocyanine] (2) and zinc(II) mono–[3–(4–phenoxy) (propanoic acid) phthalocyanine (3) are reported in this work. Compounds 2 and 3 were covalently linked to glutathione capped silver (AgNPs–GSH), gold (AuNPs–GSH) and silver-gold allo...
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Journal of Photochemistry and Photobiology A: Chemistry
2020
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Online Access: | https://www.sciencedirect.com/science/article/abs/pii/S1010603017311528 http://hdl.handle.net/11408/3852 |
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author | Dube, Edith Oluwole, David, O Nyokong, Tebello Nwaji, Njemuwa Mack, John |
author_facet | Dube, Edith Oluwole, David, O Nyokong, Tebello Nwaji, Njemuwa Mack, John |
author_sort | Dube, Edith |
collection | DSpace |
description | The syntheses of zinc(II) tetra–[3–(4–phenoxy) (propanoic acid) phthalocyanine] (2) and zinc(II) mono–[3–(4–phenoxy) (propanoic acid) phthalocyanine (3) are reported in this work. Compounds 2 and 3 were covalently linked to glutathione capped silver (AgNPs–GSH), gold (AuNPs–GSH) and silver-gold alloy (Ag3Au1NPs–GSH) nanoparticles (NPs) via an amide bond formation to afford the conjugates: 2–AgNPs–GSH, 3–AgNPs–GSH, 2–AuNPs–GSH, 3–AuNPs–GSH, 2-Ag3Au1NPs–GSH and 3-Ag3Au1NPs–GSH. The photophysicochemical behaviours of the compounds and their conjugates with NPs were assessed in solution. The conjugates afforded a decrease in fluorescence quantum yields and lifetimes with improved triplet quantum yields in comparison to the compounds. Accordingly, the AgNPs and AuNPs conjugates with the compounds afforded high singlet quantum yields. On the contrary, the conjugates of the alloy afforded decreased singlet quantum yields probably due to the screening effect. The compounds and their conjugates with NPs could serve as a viable and efficacious photosensitizer for photodynamic therapy. |
format | Article |
id | ir-11408-3852 |
institution | My University |
language | English |
publishDate | 2020 |
publisher | Journal of Photochemistry and Photobiology A: Chemistry |
record_format | dspace |
spelling | ir-11408-38522022-06-27T13:49:06Z Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles Dube, Edith Oluwole, David, O Nyokong, Tebello Nwaji, Njemuwa Mack, John zinc phthalocyanine Ag-Au nanoparticles triplet quantum yield singlet oxygen quantum yield The syntheses of zinc(II) tetra–[3–(4–phenoxy) (propanoic acid) phthalocyanine] (2) and zinc(II) mono–[3–(4–phenoxy) (propanoic acid) phthalocyanine (3) are reported in this work. Compounds 2 and 3 were covalently linked to glutathione capped silver (AgNPs–GSH), gold (AuNPs–GSH) and silver-gold alloy (Ag3Au1NPs–GSH) nanoparticles (NPs) via an amide bond formation to afford the conjugates: 2–AgNPs–GSH, 3–AgNPs–GSH, 2–AuNPs–GSH, 3–AuNPs–GSH, 2-Ag3Au1NPs–GSH and 3-Ag3Au1NPs–GSH. The photophysicochemical behaviours of the compounds and their conjugates with NPs were assessed in solution. The conjugates afforded a decrease in fluorescence quantum yields and lifetimes with improved triplet quantum yields in comparison to the compounds. Accordingly, the AgNPs and AuNPs conjugates with the compounds afforded high singlet quantum yields. On the contrary, the conjugates of the alloy afforded decreased singlet quantum yields probably due to the screening effect. The compounds and their conjugates with NPs could serve as a viable and efficacious photosensitizer for photodynamic therapy. 2020-10-23T11:31:10Z 2020-10-23T11:31:10Z 2017-12-01 Article https://www.sciencedirect.com/science/article/abs/pii/S1010603017311528 http://hdl.handle.net/11408/3852 en Vol.349 , 148 - 161; open Journal of Photochemistry and Photobiology A: Chemistry |
spellingShingle | zinc phthalocyanine Ag-Au nanoparticles triplet quantum yield singlet oxygen quantum yield Dube, Edith Oluwole, David, O Nyokong, Tebello Nwaji, Njemuwa Mack, John Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles |
title | Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles |
title_full | Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles |
title_fullStr | Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles |
title_full_unstemmed | Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles |
title_short | Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles |
title_sort | investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles |
topic | zinc phthalocyanine Ag-Au nanoparticles triplet quantum yield singlet oxygen quantum yield |
url | https://www.sciencedirect.com/science/article/abs/pii/S1010603017311528 http://hdl.handle.net/11408/3852 |
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