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Robust Colloidal Nanoparticles of Pyrrolopyrrole Cyanine J‐Aggregates with Bright Near‐Infrared Fluorescence in Aqueous Media: From Spectral Tailoring to Bioimaging Applications
Author(s) -
Yang Cangjie,
Wang Xiaochen,
Wang Mingfeng,
Xu Keming,
Xu Chenjie
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201604741
Subject(s) - cyanine , fluorescence , chromophore , colloid , nanoparticle , aqueous solution , polymer , materials science , quantum yield , amphiphile , photochemistry , infrared , sonication , chemical engineering , nanotechnology , chemistry , copolymer , organic chemistry , chromatography , optics , physics , engineering , composite material
Colloidal nanoparticles (NPs) containing near‐infrared‐fluorescent J‐aggregates (JAGGs) of pyrrolopyrrole cyanines (PPcys) stabilized by amphiphilic block co‐polymers were prepared in aqueous medium. JAGG formation can be tuned by means of the chemical structure of PPcys, the concentration of chromophores inside the polymeric NPs, and ultrasonication. The JAGG NPs exhibit a narrow emission band at 773 nm, a fluorescence quantum yield comparable to that of indocyanine green, and significantly enhanced photostability, which is ideal for long‐term bioimaging.