Transition-Metal-Free C–H/C–Li Coupling of Nonaromatic 2H-Imidazole 1-Oxides with Pentafluorophenyl Lithium in the Design of Novel Fluorophores with Intramolecular Charge Transfer Effect

2020 ◽  
Vol 85 (17) ◽  
pp. 11124-11133
Author(s):  
Timofey D. Moseev ◽  
Mikhail V. Varaksin ◽  
Denis A. Gorlov ◽  
Valery N. Charushin ◽  
Oleg N. Chupakhin
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Intramolecular Charge Transfer ◽  
Transfer Effect ◽  
Metal Free

Diagnosis of Fatty Liver Disease by a Bright, Multiphoton-Active and Lipid-Droplet-Specific AIEgen with Nonaromatic Rotors

2020 ◽  
Author(s):  
Hojeong Park ◽  
Shijie Li ◽  
Guangle Niu ◽  
Haoke Zhang ◽  
Zhuoyue Song ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Liver Disease ◽  
Fatty Liver ◽  
Lipid Droplet ◽  
Fatty Liver Disease ◽  
Intramolecular Charge Transfer ◽  
Stokes Shift ◽  
Transfer Effect ◽  
Photon Absorption ◽  
Two Photon

Fatty liver disease (FLD) has become an increasing global health risk. However, an accurate diagnosis of FLD at an early stage remains a great challenge due to lack of suitable imaging tools. To this end, we developed the first fluorescent two-photon aggregationinduced emission (AIE) luminogen ABCXF for high-contrast imaging of FLD tissue. ABCXF has a large Stokes shift, good two-photon absorption cross-section, bright red emission, high fluorescence quantum yield in solid state, and excellent photostability. It shows abnormal intramolecular charge transfer effect instead of twisted intramolecular charge transfer effect in polar solvents. Photophysical and crystal data demonstrated that it exhibits nonaromatic rotors - trifluoromethyto contribute to its AIE effect. Biocompatible lipid droplet-targeting ABCXF can selectively light up lesions in the FLD tissue with a high signal-to-noise ratio. It shows superior imaging performances compared to Oil Red O. Thus, ABCXF can be a powerful tool for the diagnosis and evaluation of FLD from a liver biopsy.

An A–D–A′–D–A type small molecule acceptor with a broad absorption spectrum for organic solar cells

2018 ◽  
Vol 54 (3) ◽  
pp. 303-306 ◽  
Author(s):  
Junhui Miao ◽  
Bin Meng ◽  
Jun Liu ◽  
Lixiang Wang
Keyword(s):  
Absorption Spectrum ◽  
Solar Cells ◽  
Charge Transfer ◽  
Absorption Spectra ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Intramolecular Charge Transfer ◽  
Transfer Effect ◽  
Broad Absorption

The use of an A–D–A′–D–A strategy to develop small molecule acceptors with broad absorption spectra through suppressing the intramolecular charge transfer effect is studied.

Transient Absorption Properties of 1, 8, 15, 22-Tetra-N-Pentyloxy Metallophthalocyanines and Metal Free Phthalocyanine

2012 ◽  
Vol 557-559 ◽  
pp. 1117-1120
Author(s):  
Xi Ran Wei ◽  
Chun Ying He ◽  
Zhi Min Chen ◽  
Wei Na Song ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transient Absorption ◽  
Flash Photolysis ◽  
Transfer Effect ◽  
Absorption Properties ◽  
Metal Free ◽  
Triplet Lifetime ◽  
Triplet Absorption

In this paper, the triplet properties of a series of 1, 8, 15, 22-tetra-n-pentyloxy metallophthalocyanines [α-MPc(OC5H11)4), M=Fe, Ni, Cu, Zn] and metal free phthalocyanine [H2Pc((OC5H11)4)] were investigated using flash photolysis technique in solutions at the concentration of 10-5mol/L. The triplet absorption curves and triplet lifetimes were acquired. ZnPc(OC5H11)4 exhibits a strong triplet absorption and has long triplet lifetime due to the d-electron and charge transfer effect.

Synthesis and Optical Properties of Asymmetric Naphthylmethylene 1,3,4-Oxadiazole Derivatives

2014 ◽  
Vol 1033-1034 ◽  
pp. 1109-1113
Author(s):  
Ting Feng Tan ◽  
Bian Peng Wu ◽  
Li Gang Bai ◽  
Yan Xia Li ◽  
Ming Jie Zhang
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Fluorescence Spectroscopy ◽  
Fluorescence Intensity ◽  
Absorption Maximum ◽  
Intramolecular Charge Transfer ◽  
Bathochromic Shift ◽  
Transfer Effect ◽  
Uv Absorption ◽  
Oxadiazole Derivatives

Asymmetric 2-p-nitrophenyl-5-naphthylmethylene-1,3,4-oxadiazole and 2-p-aminophenyl-5-naphthylmethylene-1,3,4-oxadiazole were synthesized and characterized by IR、1HNMR and MS analysis, and their optical properties were detected using UV-vis absorption spectroscopy and fluorescence spectroscopy. The existence of electron-withdrawing oxadiazole units causes a significant bathochromic shift of the UV absorption maximum. The largest UV-absorption peak of target compounds is in the range of 298-317 nm, and a new emission band at 402 nm is formed. The fluorescence intensity is gradually enhanced, which strengthens the intramolecular charge transfer effect between the electron-withdrawing oxadiazole and electron-donating aniline.

Sign in / Sign up

Export Citation Format

Share Document