Interplay between conformational and solvent effects in UV-visible absorption spectra: curcumin tautomers as a case study

2019 ◽  
Vol 21 (28) ◽  
pp. 15504-15514 ◽  
Author(s):  
Alessandra Puglisi ◽  
Tommaso Giovannini ◽  
Liudmil Antonov ◽  
Chiara Cappelli
Keyword(s):  
Aqueous Solution ◽  
Experimental Study ◽  
Absorption Spectra ◽  
Solvent Effects ◽  
Visible Absorption ◽  
Tautomeric Forms ◽  
Uv Visible

We present a combined theoretical and experimental study on the UV-vis spectra of enol–keto (EK) and keto–keto (KK) tautomeric forms of curcumin dissolved in aqueous solution.

scholarly journals Solvent Effects on the UV/ Visible Absorption Spectra of Some Aminoazobenzene Dyes

2012 ◽  
Vol 1 (1) ◽  
pp. 1-8 ◽  
Author(s):  
M. S. ZAKERHAMIDI ◽  
A. GHANADZADEH ◽  
M. MOGHADAM
Keyword(s):  
Absorption Spectra ◽  
Solvent Effects ◽  
Visible Absorption ◽  
Uv Visible

Quantum Yields for the Photodegradation of Pollutants in Dilute Aqueous Solution: Phenol, 4-Chlorophenol and N-Nitrosodimethylamine

1996 ◽  
Vol 1 (2) ◽  
Author(s):  
Te-Fu L. Ho ◽  
James R. Bolton ◽  
Ewa Lipczynska-Kochany
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Quantum Yield ◽  
High Performance ◽  
Flash Photolysis ◽  
Quantum Yields ◽  
Visible Absorption ◽  
Dilute Aqueous Solution ◽  
Uv Visible ◽  
Photolysis Of Phenol

AbstractA broadband method has been applied to determine the quantum yields for the photochemical removal of three common pollutants: phenol, 4-chlorophenol and N-nitrosodimethylamine (NDMA) in dilute aqueous solution. Flash photolysis (xenon flash lamps) was used to cause a significant amount of photolysis without photolyzing intermediates. The analysis of reactant depletion following a single flash was carried out by high- performance liquid chromatography (HPLC) or UV/visible absorption spectroscopy. The method for determining quantum-yields employed p-benzoquinone as an actinometer and was validated by determining the average (200-400 nm) quantum yield for the generation of hydroxyl radicals from the photolysis of hydrogen peroxide (0.90 ± 0.10) and the quantum yields for the photolysis of phenol (0.13 ± 0.02) and 4-chlorophenol (0.24 ± 0.04). The values determined agree very well with the literature ones obtained with monochromatic radiation. The quantum yield for the direct photolysis of NDMA was found to be 0.11 ± 0.03 at neutral pH and 0.27 ± 0.02 at pH 2-4. Under conditions where hydrogen peroxide is the principal absorber, the NDMA quantum yield is 0.32 ± 0.04, independent of pH in the range 2-8.

Simulation of the UV/Visible Absorption Spectra of Fluorescent Protein Chromophore Models

ChemPhotoChem ◽  
2017 ◽  
Vol 1 (6) ◽  
pp. 281-296 ◽  
Author(s):  
Freddy Zutterman ◽  
Vincent Liégeois ◽  
Benoît Champagne
Keyword(s):  
Absorption Spectra ◽  
Fluorescent Protein ◽  
Visible Absorption ◽  
Uv Visible

The aggregation and reaction with oxygen of the tetrasodium salt of cobalt phthalocyanine-4,4',4'',4'''-tetrasulphonic acid

1973 ◽  
Vol 26 (2) ◽  
pp. 319 ◽  
Author(s):  
LC Gruen ◽  
RJ Blagrove
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Molecular Oxygen ◽  
Absorption Spectra ◽  
Alkaline Solution ◽  
Cobalt Phthalocyanine ◽  
Visible Absorption ◽  
Reversible Addition ◽  
Dimeric Form ◽  
Low Ionic Strength

The reversible addition of molecular oxygen to the tetrasodium salt of cobalt phthalocyanine-4,4?,4?,4??-tetrasulphonic acid in aqueous solution has been confirmed. Visible absorption spectra of the monomeric and dimeric species and of the oxygen adduct have been determined. A monomer-dimer system prevails at neutral pH, low ionic strength, and low dye concentrations. The oxygen adduct and the dimeric form of the dye predominate in alkaline solution.

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