An exemplary relationship between the extent of cofacial aggregation and fluorescence quantum yield as exhibited by quaternized amphiphilic phthalocyanines

2014 ◽  
Vol 43 (15) ◽  
pp. 5886-5892 ◽  
Author(s):  
Thiago Teixeira Tasso ◽  
Yasuhiro Yamasaki ◽  
Taniyuki Furuyama ◽  
Nagao Kobayashi
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Fluorescence Properties

A good correlation between aggregation and fluorescence properties of amphiphilic phthalocyanines can be observed.

Synthesis and fluorescence properties of novel squarylium–boron complexes

2017 ◽  
Vol 4 (8) ◽  
pp. 1522-1527 ◽  
Author(s):  
Yasuhiro Kubota ◽  
Masahiro Tsukamoto ◽  
Katsuhiro Ohnishi ◽  
Jiye Jin ◽  
Kazumasa Funabiki ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Fluorescence Properties ◽  
Enhanced Fluorescence ◽  
Boron Complexes ◽  
Squarylium Dyes

Novel squarylium–boron complexes showed a significantly enhanced fluorescence quantum yield compared to the corresponding uncomplexed squarylium dyes.

THE EFFECT OF DIMETHYLSULFOXIDE ON THE FLUORESCENCE PROPERTIES OF SOME 4-HYDROXYQUINOLINES

2021 ◽  
Vol 55 (2 (255)) ◽  
pp. 112-117
Author(s):  
Karine R. Grigoryan ◽  
Hasmik A. Shilajyan ◽  
Iskuhi L. Aleksanyan ◽  
Zara L. Grigoryan ◽  
Lilit P. Hambardzumyan
Keyword(s):  
Charge Transfer ◽  
Quantum Yield ◽  
Aqueous Solutions ◽  
Electron Density ◽  
Aromatic Ring ◽  
Fluorescence Quantum Yield ◽  
Tautomeric Equilibrium ◽  
Fluorescence Properties ◽  
Fluorescence Efficiency ◽  
Dmso Concentration

Fluorescence properties of 4-hydroxy-2-methylquinoline (1) and 2-(5-mercapto-1,3,4-oxadiazol-2-yl)-6-methylquinoline-4-ol (2) were studied in dimethylsulfoxide (DMSO) aqueous solutions. The fluorescence properties of 1 and 2 exhibit substantial dependence on the DMSO concentration. The fluorescence quantum yield $(\Phi_f)$ of 1 decreases upon adding DMSO due to the shift in the keto-enol (E) tautomeric equilibrium toward E form․ On the contrary 2 demonstrates a tendency of increase of $\Phi_f$ upon adding DMSO due to intermolecular charge transfer from DMSO to the aromatic ring of quinoline, which increases the electron density on the ring and hence the fluorescence efficiency.

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...

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

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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