scholarly journals Molar extinction coefficient of fullerenes and related hydrogenated derivatives “fulleranes”

2011 ◽  
Vol 7 (S283) ◽  
pp. 324-325 ◽  
Author(s):  
Franco Cataldo ◽  
Susana Iglesias-Groth ◽  
Arturo Manchado
Keyword(s):  
Infrared Spectra ◽  
Molar Absorptivity ◽  
Laboratory Scale ◽  
Extinction Coefficients ◽  
Protoplanetary Nebulae ◽  
Astrophysical Objects ◽  
Carbon Molecules ◽  
Derivatives Of ◽  
Molar Extinction Coefficients

AbstractFullerenes, the carbon molecules with 60 and 70 atoms, were recently detected in a series of planetary nebulae, in protoplanetary nebulae and in other astrophysical objects. The detection and the quantitative determination of these molecules was made possible by the measurement of their reference infrared spectra and the relative molar extinction coefficients and integrated molar absorptivity on laboratory scale. It is expected that also fulleranes the hydrogenated derivatives of C60 and C70 may be present in the same objects where fullerenes were detected. This prompted us to synthesize the hydrogenated fullerenes, to record their infrared spectra and the measure the molar extinction coefficients and integrated molar absorptivity on laboratory scale to have a reference in the search of these fullerene derivatives in space

scholarly journals Spectrophotometric Determination of the Ionization Constants for the Oximes – Cholinesterases Reactivators at Different Temperatures

2019 ◽  
Vol 2 (3) ◽  
pp. e00097
Author(s):  
T.V. Schäfer ◽  
A.A. Tyaptin ◽  
T.B. Pechurina
Keyword(s):  
Aqueous Solutions ◽  
Incubation Medium ◽  
Ph Value ◽  
Ionization Constants ◽  
Medium Ph ◽  
Extinction Coefficients ◽  
Spectrophotometric Data ◽  
Different Temperatures ◽  
Molar Extinction Coefficients

The goal of study was the determination of the ionization constants for the oximes – cholinesterases reactivators in aqueous solutions at different temperatures. The wavelengths of absorption maxima of the protonated and deprotonated oxime groups, the molar extinction coefficients of the various oximes species, and the ionization constants for the oxime cholinesterases reactivators (isonitrosin, pralidoxime, dipyroxime, toxogonin, methoxime, carboxime and asoxime) were obtained using spectrophotometric data (wavelength 190 to 450 nm) in solutions (pH 5 – 12) at 20°C, 25°C and 37°C. The proportion of nucleophilic forms involved in the oxime-induced reactivation of phosphorylated cholinesterases was shown to be is positively dependent on the incubation medium pH value and temperature. A hypothesis that the temperature affects the oximes ability to reactivate phosphorylated cholinesterases has been proposed.

Preparation and Spectral Compilation of FD&C Red No. 40 Intermediates and Subsidiary Dyes

1976 ◽  
Vol 59 (6) ◽  
pp. 1294-1311 ◽  
Author(s):  
Sandra J Bell
Keyword(s):  
Infrared Spectra ◽  
Extinction Coefficients ◽  
Analytical Standards ◽  
Identification Of Unknown Compounds ◽  
Molar Extinction Coefficients

Abstract FD&C Red No. 40 may contain higher or lower sulfonated subsidiary dyes, depending on the purity of intermediates used. Samples of 10 possible subsidiaries were prepared and purified. They are to serve as analytical standards to aid in the identification of unknown compounds frequently appearing during the analysis of certification samples. Visible, ultraviolet, and infrared spectra as well as absorptivities and molar extinction coefficients are given for each dye.

Determination of the molar extinction coefficients of the deuteroferriheme analogs of peroxidase enzyme compounds I and II

1992 ◽  
Vol 31 (7) ◽  
pp. 1144-1147 ◽  
Author(s):  
Fanny S. Woo ◽  
Ricardo E. Rodriguez ◽  
Dale A. Huckaby ◽  
Peter Jones ◽  
Henry C. Kelly
Keyword(s):  
Extinction Coefficients ◽  
Peroxidase Enzyme ◽  
Molar Extinction Coefficients

scholarly journals Determination of New IR and UV/VIS Spectroscopic Parameters of the C84-D2:22 Isomer for Its Quantitative Assessment, Identification and Possible Applications

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 757
Author(s):  
Tamara Jovanović
Keyword(s):  
Electronic Absorption ◽  
Theoretical Calculations ◽  
Antiviral Agents ◽  
Radical Scavenging ◽  
Carbon Cluster ◽  
Molar Absorptivity ◽  
Absorption Bands ◽  
Spectroscopic Parameters ◽  
Extinction Coefficients ◽  
Molar Extinction Coefficients

The stable isomers of the higher fullerenes C76-D2 and C84-D2:22, as well as fullerenes C60 and C70 were isolated from carbon soot by the new and improved extraction and chromatographic methods and processes. Characterizations of the C84-D2:22 isomer in this study were performed by infrared and electronic absorption spectroscopy. All of the experimentally observed IR and UV/VIS bands were in excellent agreement with the semi-empirical, DFT and TB potential theoretical calculations for this molecule. The molar extinction coefficients and the integrated molar extinction coefficients of the observed larger number of completely separated infrared absorption maxima and shoulders of fullerene C84-D2:22, as well as of its main convoluted maxima, in different and new relevant entire integration ranges, including neighboring, and all surrounding absorption shoulders were determined and their relative intensities compared. In addition, the molar absorptivity of the electronic absorption bands of this carbon cluster was found. The new IR and UV/VIS spectroscopic parameters that are significant for the quantitative determination, identification and numerous possible applications of C84-D2:22 are obtained and their changes compared to C76-D2 observed. Isolated and characterized C84-D2:22, as well as other fullerenes from this research can be used in electronic, optical, chemical and biomedical devices, superconductors, semiconductors, batteries, catalysts, polymers, sensors, solar cells, nanophotonic lenses with better optical transmission, refraction and wettability, diagnostic and therapeutic pharmaceutical substances, such as those against diabetes, cancer, neurodegenerative disorders, free radical scavenging, radio nuclear, antibacterial and antiviral agents that can inhibit HIV 1, HSV, COVID-19, influenza, malaria and so forth.

Chemical Syntheses and Properties of Hydroxycinnamoyl- Coenzyme A Derivatives

1975 ◽  
Vol 30 (5-6) ◽  
pp. 352-358 ◽  
Author(s):  
J. Stöekigt ◽  
M. H. Zenk
Keyword(s):  
Coenzyme A ◽  
Uv Spectra ◽  
Cinnamic Acids ◽  
Extinction Coefficients ◽  
Chromatographic Behaviour ◽  
Thiol Esters ◽  
Hydroxysuccinimide Esters ◽  
Derivatives Of ◽  
Molar Extinction Coefficients

Abstract Coenzyme A Thiol Esters, Cinnamic Acids Acyl-CoA derivatives of several hydroxylated cinnamic acids have been synthesized in 30 to 50% yield via a. acyl phenyl thiol esters, b. acyl N-hydroxysuccinimide esters, and c. glucocinnamoyl derivatives. Properties of the intermediates have been determined. The cinnamyol-CoA thiol esters were characterized by their chromatographic behaviour and UV spectra. The molar extinction coefficients of these important intermediates in plant phenylpropane metabolism have been unequivocally determined. Recently published values13 for the molar extinction coefficients of these derivatives are incorrect; the methodological reason for this error has been established.

Photochromism of peri-aryloxy-p-quinones. Determination of molar extinction coefficients of 6-phenoxy-5,11-naphthacenequinones

1979 ◽  
Vol 30 (5) ◽  
pp. 691-693
Author(s):  
Yu. E. Gerasimenko ◽  
A. A. Parshutkin ◽  
N. T. Poteleshchenko ◽  
V. P. Poteleshchenko ◽  
V. V. Romanov
Keyword(s):  
Extinction Coefficients ◽  
Molar Extinction Coefficients
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