Oxonium Salts in the Synthesis and Spectral Behavior of Pyrano(pyrylium)‐mono methine Cyanine Dyes

2019 ◽  
Vol 56 (6) ◽  
pp. 1722-1732
Author(s):  
Ahmed I. M. Koraiem ◽  
Hassan A. Shindy ◽  
Ragab M. Abu‐El‐Hamd ◽  
Ahmed M. A. Motaleb
Keyword(s):  
Cyanine Dyes ◽  
Spectral Behavior ◽  
Oxonium Salts

ChemInform Abstract: SYNTHESIS, SPECTRAL BEHAVIOR AND BIOLOGICAL ACTIVITY OF PYRAZOLO-PYRIMIDINE CYANINE DYES

1985 ◽  
Vol 16 (30) ◽  
Author(s):  
M. A. EL-MAGHRABY ◽  
A. I. M. KORAIEM ◽  
F. M. E. ABD EL-LATIF
Keyword(s):  
Biological Activity ◽  
Cyanine Dyes ◽  
Spectral Behavior

Synthesis, spectral behavior and biological activity of some novel 1,3,4-oxadiazine cyanine dyes

2015 ◽  
Vol 6 (2) ◽  
pp. 151-156
Author(s):  
Hassan Abazied Shindy ◽  
Maha Mubark Goma ◽  
Nemat Abd El-Rahman Harb
Keyword(s):  
Biological Activity ◽  
Cyanine Dyes ◽  
Spectral Behavior

The use of oxonium salts in the synthesis of mono-, ?-substituted dimethine and styryl cyanine dyes

2005 ◽  
Vol 66 (3) ◽  
pp. 201-209 ◽  
Author(s):  
R ABDELAAL ◽  
A KORAIEM ◽  
Z KHALIL ◽  
A ELKODEY
Keyword(s):  
Cyanine Dyes ◽  
Oxonium Salts

A New Method for the Synthesis of Heptamethine Cyanine Dyes:  Synthesis of New Near Infrared Fluorescent Labels

1997 ◽  
Vol 62 (26) ◽  
pp. 9387-9387 ◽  
Author(s):  
Narasimhachari Narayanan ◽  
Lucjan Strekowski ◽  
Malgorzata Lipowska ◽  
Gabor Patonay
Keyword(s):  
Near Infrared ◽  
Cyanine Dyes ◽  
New Method ◽  
Fluorescent Labels

Synthesis, photosensitization and antimicrobial activity evaluation of some novel Merocyanine dyes

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Aspergillus Flavus ◽  
Elemental Analysis ◽  
Cyanine Dyes ◽  
Fungal Strains ◽  
Activity Evaluation ◽  
Visible Spectra ◽  
Merocyanine Dyes

Novel acyclic and cyclic merocyanine dyes derived from the nucleu of furo [(3,2-d) pyrazole; ( d 2 , 3 )imidazole]were prepared. The electronic visible absorptionspectra of all the synthesized new cyanine dyes were examined in 95% ethanolsolution to evaluate their photosensitization properties. Antibacterial andantifungal activities for some selected dyes were tested against various bacterialand fungal strains (Escherichia coli, Staphylococcus aureus, Aspergillus flavus andCandida albicans) to evaluate their antimicrobial activity. Structural identificationwas carried out via elemental analysis, visible spectra, IR and 1H NMRspectroscopic data.

Synthesis and in vitro evaluation of the antitumoral phototherapeutic potential of squaraine cyanine dyes derived from indolenine

2019 ◽  
Vol 167 ◽  
pp. 98-108 ◽  
Author(s):  
Eurico Lima ◽  
Octávio Ferreira ◽  
Vanessa S.D. Gomes ◽  
Adriana O. Santos ◽  
Renato E. Boto ◽  
...  
Keyword(s):  
Cyanine Dyes ◽  
In Vitro Evaluation

ChemInform Abstract: Cyanine Dyes (VI), (VII), (IX), (XI), (XIII), (XV) from 4-Methyl-6-hydroxyquinoline (I).

ChemInform ◽  
1988 ◽  
Vol 19 (43) ◽  
Author(s):  
I. L. MUSHKALO ◽  
O. A. IL'CHENKO ◽  
A. I. TOLMACHEV ◽  
B. M. GUTSULYAK
Keyword(s):  
Cyanine Dyes

scholarly journals Effect of Laser Irradiation on Emissivity of Flame-Generated Nanooxides

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2303
Author(s):  
Silvana De Iuliis ◽  
Roberto Dondè ◽  
Igor Altman
Keyword(s):  
Laser Irradiation ◽  
Light Emission ◽  
Energy Gap ◽  
Particle Temperature ◽  
Electron Excitation ◽  
Flame Spray ◽  
Energy Bands ◽  
Light Emitting ◽  
Spectral Behavior ◽  
The Difference

The application of pyrometry to retrieve particle temperature in particulate-generating flames strictly requires the knowledge of the spectral behavior of emissivity of light-emitting particles. Normally, this spectral behavior is considered time-independent. The current paper challenges this assumption and explains why the emissivity of oxide nanoparticles formed in flame can change with time. The suggested phenomenon is related to transitions of electrons between the valence and conduction energy bands in oxides that are wide-gap dielectrics. The emissivity change is particularly crucial for the interpretation of fast processes occurring during laser-induced experiments. In the present work, we compare the response of titania particles produced by a flame spray to the laser irradiation at two different excitation wavelengths. The difference in the temporal behavior of the corresponding light emission intensities is attributed to the different mechanisms of electron excitation during the laser pulse. Interband transitions that are possible only in the case of the laser photon energy exceeding the titania energy gap led to the increase of the electron density in the conduction band. Relaxation of those electrons back to the valence band is the origin of the observed emissivity drop after the UV laser irradiation.

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