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.

Molar extinction coefficients of IR absorption bands of Cu(II) dipivaloylmethanate

2000 ◽  
Vol 67 (1) ◽  
pp. 40-44
Author(s):  
L. F. Bakhturova ◽  
V. V. Bakovets ◽  
T. M. Levashova ◽  
I. P. Dolgovesova ◽  
V. O. Borisov
Keyword(s):  
Ir Absorption ◽  
Absorption Bands ◽  
Extinction Coefficients ◽  
Molar Extinction Coefficients

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 IR and UV/VIS Spectroscopic Characterization of the Higher Fullerene C76-D2 for Its Quantitative and Qualitative Determination

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Tamara Jovanović ◽  
Djuro Koruga ◽  
Aleksandra Mitrović ◽  
Dragomir Stamenković ◽  
Gordana Dević
Keyword(s):  
Theoretical Calculations ◽  
Spectroscopic Characterization ◽  
Molar Absorptivity ◽  
Engineering Industry ◽  
Ir Absorption ◽  
Absorption Bands ◽  
Optical Limiters ◽  
Carbon Soot ◽  
Synthesized Materials

The only stable isomer of the higher fullerene C76 of D2 symmetry was isolated from carbon soot by the new and advanced extraction and chromatographic methods and processes. Characterization of the isolated C76-D2 was performed by the IR(KBr) and UV/VIS method in the absorption mode. All of the experimentally observed infrared and electronic absorption bands are in excellent agreement with the theoretical calculations for this fullerene. The molar absorptivity ε and the integrated molar absorptivity Ψ of the observed entire new series of various characteristic, both deconvoluted and convoluted IR absorption bands of the C76-D2 isomer, in different integration ranges were determined. In addition, the molar extinction coefficients of its UV/VIS absorption bands were determined. The obtained novel IR and UV/VIS spectroscopic parameters are significant for the quantitative assessment of C76-D2. All the presented data are important both for its qualitative and quantitative determination, either in natural resources on Earth and in space or in artificially synthesized materials, electronic and optical devices, optical limiters, sensors, polymers, solar cells, nanophotonic lenses, diagnostic and therapeutic agents, pharmaceutical substances, for targeted drug delivery, incorporation of metal atoms, in biomedical engineering, industry, applied optical science, batteries, catalysts and so forth.

scholarly journals Grape Canes from Typical Cultivars of Campania (Southern Italy) as a Source of High-Value Bioactive Compounds: Phenolic Profile, Antioxidant and Antimicrobial Activities

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2746
Author(s):  
Giuseppe Squillaci ◽  
Carla Zannella ◽  
Virginia Carbone ◽  
Paola Minasi ◽  
Veronica Folliero ◽  
...  
Keyword(s):  
Southern Italy ◽  
Radical Scavenging Activity ◽  
Antiviral Agents ◽  
Radical Scavenging ◽  
Antimicrobial Activities ◽  
Total Phenolic ◽  
Antioxidant Power ◽  
Herpes Simplex Viruses ◽  
Ferric Reducing Antioxidant Power ◽  
Antioxidant And Antimicrobial Activities

The purpose of the current study was to determine the phenolic composition, antioxidant, and antimicrobial activities in grape cane extracts from typical cultivars of Southern Italy. Aqueous extracts at different pHs (1–13) were prepared from “Aglianico”, “Fiano”, and “Greco” grape canes. The results demonstrated that an alkaline pH (13.00) produced the best polyphenol-rich extracts, as the total phenolic content was more than double when compared to the respective extracts prepared at pH 1.00. “Greco” grape canes gave the highest quantity of phenolic compounds at each pH, ranging from 42.7 ± 0.4 to 104.3 ± 3.0 mg Gallic Acid Equivalents (GAE)/g Dry Extract (DE) from pH 1.00 to 13.00. The Radical Scavenging Activity (RSA) and the Ferric Reducing Antioxidant Power (FRAP) were measured. The highest antioxidant activity was showed by “Greco” extract at pH 7.00. Seventy-five compounds were identified in the extracts by HPLC-MS with six of them described for the first time in grape canes. Procyanidins were highly abundant in extracts at pH 7.00, whereas stilbenoids were the most represented compounds at pH 13.00. Very strong antiviral activity against herpes simplex viruses was recorded for the extracts at pH 7.00 and 13.00 that were active in the early stages of infection by acting directly against the viral particles. The overall results suggest that grape canes, currently underutilized, can be usefully valorised by providing active extracts to use as antioxidant and antiviral agents.

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