title: Photophysical properties of a new water soluble tetra thiamine substituted zinc phthalocyanine conjugated to gold nanorods of different aspect ratios.
abstract: A water soluble zinc phthalocyanine substituted with thiamine is reported in this work. The aggregation of this compound in aqueous solutions causes quenching of the fluorescence quantum yields. Gold nanospheres and nanorods were linked to the phthalocyanine. X-ray photoelectron spectroscopy showed that both the amine and the sulphur groups on the thiamine substituent of the zinc phthalocyanine were involved in the linking to gold nanoparticles. The Pc showed an increase in the fluorescence quantum yields in the presence of the nanoparticles. The singlet oxygen quantum yield increased when the Pc was conjugated to the nanoparticles and even higher for larger aspect ratio gold nanorods.
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa. t.nyokong@ru.ac.za.
authors.forename: Thandekile
authors.initials: T
authors.lastname: Mthethwa
authors.forename: Edith
authors.initials: E
authors.lastname: Antunes
authors.forename: Tebello
authors.initials: T
authors.lastname: Nyokong
mesh_terms: D065966:Absorption, Physicochemical; D006046:Gold / Q000737:chemistry*; D007211:Indoles / Q000138:chemical synthesis / Q000737:chemistry*; D054833:Isoindoles; D015394:Molecular Structure; D043942:Nanotubes / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D017319:Photosensitizing Agents / Q000138:chemical synthesis / Q000737:chemistry*; D011789:Quantum Theory; D012995:Solubility; D013499:Surface Properties; D013831:Thiamine / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D017967:Zinc Compounds
chemical_list: D007211:Indoles; D054833:Isoindoles; D009942:Organometallic Compounds; D017319:Photosensitizing Agents; D017967:Zinc Compounds; D014867:Water; C052159:Zn(II)-phthalocyanine; D006046:Gold; D013831:Thiamine