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Synthesis and Characterization of Highly Soluble Two‐Photon‐Absorbing Chromophores with Multi‐Branched and Dendritic Architectures
Author(s) -
Lin TzuChau,
Lin WeiLun,
Wang ChihMing,
Fu ChihWei
Publication year - 2011
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201001165
Subject(s) - chromophore , chemistry , nanosecond , fluorene , photochemistry , femtosecond , two photon absorption , excited state , molecule , absorption (acoustics) , fluorescence , laser , monomer , acetylide , polymer , optics , organic chemistry , atomic physics , physics
A set of novel multi‐polar compounds composed of four fluorene‐based derivatives with systematic alteration of the molecular structure was synthesized and their nonlinear optical properties in the femtosecond and nanosecond time domain were examined. Preliminary experimental results show that the two‐photon activities of the model compounds are connected to structural parameters, such as the number of peripheral electron‐donating groups and/or the size of the π‐domain in a dye molecule. It is also found that these model chromophores possess large nonlinear attenuation under the irradiation of laser pulses working at nanosecond regimes, indicating that these compounds may have strong two‐photon‐assisted excited‐state absorption within the studied spectral region. Effective optical‐power‐limiting behaviors of the dendritic fluorophores were also demonstrated to show that such dye molecules can be potential materials for use as broadband and rapid‐responsive optical limiters, especially against laser lights with longer pulses.