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Unusual Aggregation of Nanosized Six‐Arm Star Oligofluorenes
Author(s) -
Han Yang,
Fei Zhuping,
Sun Minghao,
Bo Zhishan,
Liang WanZhen
Publication year - 2007
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200700012
Subject(s) - molecule , alkyne , dispersity , fluorescence , star (game theory) , materials science , benzene , photochemistry , nanotechnology , physics , chemistry , polymer chemistry , catalysis , optics , organic chemistry , astrophysics
Abstract A series of monodisperse six‐arm benzene‐cored star oligofluorenes are prepared by a divergent/convergent strategy, starting from the repetitive divergent synthesis of symmetrical ethynyl‐bridged oligofluorenes to the convergent Co‐catalyzed alkyne cyclotrimerization. The structures of these six‐arm molecules are fully characterized. The diameter of the largest molecule SF3 reaches ca. 3 nm. These highly substituted star‐shaped oligomers exhibit extremely high fluorescent quantum yields in solution and unexpected red‐shifted and broadened emission with fine structure in the film as a result of the formation of stable aggregates.