title: The photochemistry and photophysics of a series of non-peripherally substituted zinc phthalocyanines.
abstract: Photophysical and photochemical measurements have been made on a series of novel non-peripherally octa(alkyl-substituted) zinc phthalocyanines. Fluorescence quantum yields and lifetimes, triplet quantum yields and lifetimes and singlet delta oxygen quantum yields were measured in 1% v/v pyridine in toluene. The effects of alkyl substituents and increasing chain length relative to the unsubstituted parent molecule, zinc phthalocyanine (ZnPc), are discussed. ZnPc with alkyl substituents of chain length 5-15 carbons exhibited similar absorption and emission maxima (704 nm and 718 nm respectively) with the molar absorptivity of the Q-band approximately 10(5) M(-1) cm(-1). The series of compounds also exhibited triplet quantum yields of 0.78-0.84 and singlet oxygen quantum yields of 0.67-0.71.
authors.affiliation: School of Chemistry, University of East Anglia, Norwich, UK NR4 7TJ.
authors.forename: Magda
authors.initials: M
authors.lastname: van Leeuwen
authors.forename: Andrew
authors.initials: A
authors.lastname: Beeby
authors.forename: Stephen H
authors.initials: SH
authors.lastname: Ashworth
mesh_terms: D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D009942:Organometallic Compounds / Q000737:chemistry*; D010777:Photochemistry; D013053:Spectrophotometry; D017967:Zinc Compounds
chemical_list: D007211:Indoles; D054833:Isoindoles; D009942:Organometallic Compounds; D017967:Zinc Compounds; C052159:Zn(II)-phthalocyanine