title: Spectral, photophysical and photochemical properties of tetra- and octaglycosylated zinc phthalocyanines.
abstract: Photophysical and photochemical properties of a series of tetra- and octaglycosylated zinc phthalocyanines (ZnPcs) substituted with glucose and galactose moieties have been reported. Spectral properties of these phthalocyanines are compared in DMSO. Absorption spectra of the non-peripherally tetra-substituted ZnPcs 2 showed a significant red shift in their Q-band maxima as compared to the peripherally substituted analog 1. All the complexes gave high triplet quantum yields ranging from 0.68 to 0.88, whereas triplet lifetimes were in the range of 100-430 μs in argon-saturated solutions. The octagalactosylated ZnPc 3b showed the highest triplet quantum yield and singlet oxygen quantum yield of 0.88 and 0.69, respectively. The fluorescence quantum yields and lifetimes of all the compounds under investigation were within the range of zinc phthalocyanine complexes.
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
authors.forename: Zafar
authors.initials: Z
authors.lastname: Iqbal
authors.forename: Nkosiphile
authors.initials: N
authors.lastname: Masilela
authors.forename: Tebello
authors.initials: T
authors.lastname: Nyokong
authors.forename: Alexey
authors.initials: A
authors.lastname: Lyubimtsev
authors.forename: Michael
authors.initials: M
authors.lastname: Hanack
authors.forename: Thomas
authors.initials: T
authors.lastname: Ziegler
mesh_terms: D004121:Dimethyl Sulfoxide / Q000737:chemistry; D005690:Galactose / Q000737:chemistry; D005947:Glucose / Q000737:chemistry; D006031:Glycosylation; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D009942:Organometallic Compounds / Q000737:chemistry*; D055668:Photochemical Processes; D011789:Quantum Theory; D026082:Singlet Oxygen / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D017967:Zinc Compounds
chemical_list: D007211:Indoles; D054833:Isoindoles; D009942:Organometallic Compounds; D017967:Zinc Compounds; C052159:Zn(II)-phthalocyanine; D026082:Singlet Oxygen; D005947:Glucose; D005690:Galactose; D004121:Dimethyl Sulfoxide