title: Photophysical studies of newly derivatized mono substituted phthalocyanines grafted onto silica nanoparticles via click chemistry.
abstract: This work reports on the synthesis, characterization and photophysical studies of newly derived phthalocyanine complexes and the phthalocyanine-silica nanoparticles conjugates. The derived phthalocyanine complexes have one terminal alkyne group. The derived phthalocyanine complexes showed improved photophysical properties (ФF, ФT, ΦΔ and τT) compared to the respective phthalocyanine complexes from which they were derived. The derived phthalocyanine complexes were conjugated to the surface of an azide functionalized silica nanoparticles via copper (1) catalyzed cyclo-addition reaction. All the conjugates showed lower triplet quantum yields ranging from 0.37 to 0.44 compared to the free phthalocyanine complexes. The triplet lifetimes ranged from 352 to 484 μs for the conjugates and from 341 to 366 μs for the free phthalocyanine complexes.
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
authors.forename: Adedayo
authors.initials: A
authors.lastname: Fashina
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
authors.forename: Edith
authors.initials: E
authors.lastname: Amuhaya
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: D057930:Click Chemistry; D005453:Fluorescence; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D007211:Indoles; D054833:Isoindoles; D012822:Silicon Dioxide; C013647:phthalocyanine
keywords: Click chemistry; Fluorescence; Lifetimes; Phthalocyanine; Silica nanoparticles; Triplet quantum yields