28320-34-5Relevant articles and documents
Toward two-photon absorbing dyes with unusually potentiated nonlinear fluorescence response
Benitez-Martin, Carlos,Li, Shiming,Dominguez-Alfaro, Antonio,Najera, Francisco,Pérez-Inestrosa, Ezequiel,Pischel, Uwe,Andréasson, Joakim
, p. 14854 - 14858 (2020)
The combination of two two-photon-induced processes in a F?rster resonance energy transfer (FRET)-operated photochromic fluorene-dithienylethene dyad lays the foundation for the observation of a quartic dependence of the fluorescence signal on the excitat
Design, synthesis and properties of near-infrared molecular switches containing a fluorene ring
Chen, Peng,Wang, Hai-Ming,Liu, Guo-Jie,Zhang, Sean Xiao-An
, p. 4456 - 4463 (2016/06/06)
Three molecular switches containing a fluorene ring were designed and synthesized. The introduction of the amino group substituted fluorene ring resulted in the target molecular switches having some optical properties in the near-infrared region. It was demonstrated that the N-substituents on the fluorene rings and the switch units both had great influence on the molecular switch optical properties including the absorption maximum, absorption intensity and fluorescence quantum yield. The open-ring forms IA and IIA showed obvious solvatochromic behaviour. The closed-ring forms IIB and IIIB showed obvious hydrochromic behaviour in MeCN/water binary solvent systems and acidichromic behaviour in MeCN solution with high reversibility. Especially, the distinct off-on fluorescence signal in the near-infrared region using the stimuli of acid means that the designed compounds have great potential application value in the field of biological sensing.
Design of donor-acceptor geometry for tuning excited-state polarization: Fluorescence solvatochromism of push-pull biphenyls with various torsional restrictions on their aryl-aryl bonds
Sasaki, Shunsuke,Niko, Yosuke,Klymchenko, Andrey S.,Konishi, Gen-Ichi
, p. 7551 - 7559 (2014/12/10)
In this work, push-pull biphenyl analogs (4-(N,N-dimethylamino)-4′-formylbiphenyl) with a modulated dihedral angle of the aryl-aryl bond, using a bridged structure or methyl groups, were synthesized. Photophysical measurements of the synthesized compounds revealed the effect of the torsion between N,N-dimethylaniline (donor) and benzaldehyde moieties (acceptor) on their solvatochromic properties. Our data showed that the sensitivity of the fluorescence maxima to solvent polarity gradually increases as the biphenyl chromophore was restricted to a twisted conformation. This finding indicates that changing the torsional restrictions on the donor-acceptor system can be a factor to take into account for the development of novel solvatochromic dyes.