title: Synthesis and photophysical properties of annulated dinuclear and trinuclear phthalocyanines.
abstract: Metal-free mononuclear, dinuclear and trinuclear phthalocyanines were prepared by a mixed cyclotetramerisation of a 1,2,4,5-tetracyanobenzene derivative and 4,5-bis(2,6-dimethylphenoxy)phthalonitrile. For the first time, a pi-electron-conjugated trinuclear phthalocyanine was synthesised with phthalocyanine units connected by common annulated benzene rings. The Q band of the trinuclear compound in solution occurs at lambda = 944 nm whereas those of the dinuclear and mononuclear compounds are at lambda = 853/830 and 701/664 nm, respectively. Fluorescence quantum yields, fluorescence lifetimes and singlet-oxygen quantum yields of the compounds were determined.
authors.affiliation: Institut für Organische und Makromolekulare Chemie, Universität Bremen, P.O. Box 330440, 28334 Bremen, Germany.
authors.forename: Sergey
authors.initials: S
authors.lastname: Makarov
authors.forename: Christian
authors.initials: C
authors.lastname: Litwinski
authors.forename: Eugeny A
authors.initials: EA
authors.lastname: Ermilov
authors.forename: Olga
authors.initials: O
authors.lastname: Suvorova
authors.forename: Beate
authors.initials: B
authors.lastname: Röder
authors.forename: Dieter
authors.initials: D
authors.lastname: Wöhrle
mesh_terms: D005453:Fluorescence; D007211:Indoles / Q000138:chemical synthesis / Q000737:chemistry*; D054833:Isoindoles; D015394:Molecular Structure; D010777:Photochemistry; D011838:Radiation-Sensitizing Agents / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D007211:Indoles; D054833:Isoindoles; D011838:Radiation-Sensitizing Agents; C013647:phthalocyanine