title: Photophysical properties of zinc phthalocyanine-uridine single walled carbon nanotube--conjugates.
abstract: The photophysical properties of the conjugate of uridine and zinc mono carboxy phenoxy phthalocyanine (ZnMCPPc-uridine, 4) are reported in this work. The conjugate was also adsorbed onto single walled carbon nanotubes (ZnMCPPc-uridine-SWCNT, 5). The X-ray photoelectron spectroscopy of 4 showed three N 1s peaks while that of 5 showed four N 1s peak, a new peak at 399.4 eV of 5 was assigned to pyrrolidonic nitrogen, due to the interaction of the pyrrolic nitrogen of 4 with the oxygen moiety of SWCNT-COOH in 5. The triplet lifetime, triplet and singlet oxygen quantum yields of the zinc mono carboxy phenoxy phthalocyanine increased by over 40% in the presence of uridine. SWCNTs resulted in only a small quenching of the triplet state parameters of 4.
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
authors.forename: Racheal O
authors.initials: RO
authors.lastname: Ogbodu
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
authors.forename: Edith K
authors.initials: EK
authors.lastname: Amuhaya
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
authors.forename: Philani
authors.initials: P
authors.lastname: Mashazi
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa. Electronic address: t.nyokong@ru.ac.za.
authors.forename: Tebello
authors.initials: T
authors.lastname: Nyokong
mesh_terms: D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D026082:Singlet Oxygen / Q000737:chemistry; D014529:Uridine / Q000737:chemistry*; D017967:Zinc Compounds
chemical_list: D007211:Indoles; D054833:Isoindoles; D037742:Nanotubes, Carbon; D009942:Organometallic Compounds; D017967:Zinc Compounds; C052159:Zn(II)-phthalocyanine; D026082:Singlet Oxygen; D014529:Uridine
keywords: Carboxy phenoxy phthalocyanine; Singlet oxygen quantum yields and triplet lifetime; Triplet quantum yields; Uridine