scholarly journals Fluorescence Quantum Yield and Free Rotor Effect

1984 ◽  
Vol 4 (1-6) ◽  
pp. 305-310 ◽  
Author(s):  
M. S. A. Abdel-Mottaleb
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Internal Conversion ◽  
Structural Changes ◽  
Wave Length ◽  
Solvent Viscosity ◽  
Dependent Rate ◽  
Picosecond Time Scale ◽  
Viscous Media ◽  
Different Parts

It was found that the weakly fluorescent trans-2(4′-N,N-dimethylaminostyryl)- pyridinium betaine dyestuff (1) becomes efficiently fluorescent in very viscous media. The fluorescence quantum yield (φF) for dyestuff (1) approaches unity in ethanol–ether (1 : 1) glass at 98 K. Moreover, the fluorescence wave-length is blue shifted (1874 cm−1) when the temperature is lowered to 98 K. The results are rationalized as being due to solvent viscosity dependent rate constant for a radiationless internal conversion process, involving rotation of the different parts of the molecule, a free rotor effect. The rate of internal rotation was estimated to be 3.4 × 1011 s−1. The results suggest that this molecule can be used as a fluorescent probe to study microscopic structural changes in surrounding media occurring on the picosecond time scale.

Internal Conversion with 3,5-Dimethyl-4-(methylamino)benzonitrile in Alkane Solvents

2000 ◽  
Vol 214 (11) ◽  
Author(s):  
I. Rückert ◽  
A. Hebecker ◽  
A.B.J. Parusel ◽  
K.A. Zachariasse
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Internal Conversion ◽  
Alkane Solvents

With 3,5-dimethyl-4-(methylamino)benzonitrile (MHD) in n-hexane and n-hexadecane at 25°C, relatively small values are obtained for the fluorescence quantum yield Φ

Dramatic reduction in fluorescence quantum yield in mutants of Green Fluorescent Protein due to fast internal conversion

1998 ◽  
Vol 237 (1-2) ◽  
pp. 183-193 ◽  
Author(s):  
Andreas D Kummer ◽  
Christian Kompa ◽  
Harald Lossau ◽  
Florian Pöllinger-Dammer ◽  
Maria E Michel-Beyerle ◽  
...  
Keyword(s):  
Green Fluorescent Protein ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Internal Conversion ◽  
Fluorescent Protein ◽  
Dramatic Reduction ◽  
Green Fluorescent

Ultrafast internal conversion dynamics of bilirubin bound to UnaG and its N57A mutant

2019 ◽  
Vol 21 (5) ◽  
pp. 2365-2371 ◽  
Author(s):  
Xiaodan Cao ◽  
Changcheng Zhang ◽  
Ziheng Gao ◽  
Yangyi Liu ◽  
Yuzheng Zhao ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Hydrogen Bonds ◽  
Fluorescence Quantum Yield ◽  
Internal Conversion ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

High fluorescence quantum yield of BR in UnaG is due to direct hydrogen bonds to the endo-vinyl dipyrrinone moiety.

scholarly journals Synthesis of carbon nitride oligomer as a precursor of melon with improved fluorescence quantum yield

2021 ◽  
Vol 2 (18) ◽  
pp. 6083-6093
Author(s):  
Yuto Miyake ◽  
Goichiro Seo ◽  
Kotaro Matsuhashi ◽  
Noriyuki Takada ◽  
Kaname Kanai
Keyword(s):  
Optical Properties ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Carbon Nitride

Melem tetramer, the newly synthesized carbon nitride compound is composed of oligomers with four melem units, is stable in air, and has improved optical properties compared to melon.

UV-Trained and Metal-Enhanced Fluorescence of Biliverdin and Biliverdin Nanoparticles

Nanoscale ◽  
2021 ◽  
Author(s):  
Parinaz Fathi ◽  
Ayman Roslend ◽  
Kritika Mehta ◽  
Parikshit Moitra ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Biomedical Imaging ◽  
Enhanced Fluorescence ◽  
Metal Enhanced Fluorescence

Increasing the fluorescence quantum yield of fluorophores is of great interest for in vitro and in vivo biomedical imaging applications. At the same time, photobleaching and photodegradation resulting from continuous...

New soluble 4-(4-formyl-2,6-dimethoxyphenoxy) substituted phthalocyanines: Synthesis, characterization, photophysical and photochemical properties

2021 ◽  
pp. 1-10
Author(s):  
Ibrahim Erden ◽  
Betül Karadoğan ◽  
Fatma Aytan Kılıçarslan ◽  
Göknur Yaşa Atmaca ◽  
Ali Erdoğmuş
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Fluorescence Quantum Yield ◽  
Metal Ion ◽  
Mass Spectra ◽  
Quantum Yields ◽  
Therapeutic Outcomes ◽  
Ft Ir ◽  
Photochemical Properties ◽  
New Compounds

This work describes the synthesis, spectral and fluorescence properties of bis 4-(4-formyl-2,6-dimethoxyphenoxy) substituted zinc (ZnPc) and magnesium (MgPc) phthalocyanines. The new compounds have been characterized by elemental analysis, UV-Vis, FT-IR, 1H-NMR and mass spectra. Afterward, the effects of including metal ion on the photophysicochemical properties of the complexes were studied in biocompatible solvent DMSO to analyze their potential to use as a photosensitizer in photodynamic therapy (PDT). The fluorescence and singlet oxygen quantum yields were calculated as 0.04–0.15 and 0.70–0.52 for ZnPc and MgPc, respectively. According to the results, MgPc has higher fluorescence quantum yield than ZnPc, while ZnPc has higher singlet oxygen quantum yield than MgPc. The results show that the synthesized complexes can have therapeutic outcomes for cancer treatment.

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