Russian Journal of Applied Chemistry, Journal Year: 2023, Volume and Issue: 96(3), P. 332 - 341
Published: March 1, 2023
Language: Английский
Journal of Structural Chemistry, Journal Year: 2023, Volume and Issue: 64(5), P. 766 - 852
Published: May 1, 2023
Language: Английский
Citations
11
Chemical Engineering Science, Journal Year: 2025, Volume and Issue: unknown, P. 121732 - 121732
Published: May 1, 2025
Language: Английский
Citations
0
Energy & Fuels, Journal Year: 2023, Volume and Issue: 37(16), P. 11797 - 11806
Published: Aug. 2, 2023
The work demonstrates the great potential of using a vanadyl porphyrin probe to study resin–paraffin aggregation processes in oils. dynamics and polarity local environment octaethylporphine (VOOEP), used as spin probe, specially introduced into oil with high content paraffins resins, have been studied. It has found that VOOEP does not enter paraffin crystallites even at temperatures 25 K below wax appearance temperature but forms aggregates composed resin molecules can be adsorbed onto surface paraffins. proposed approach precise simulation experimental ESR spectra based on Monte Carlo method range which partial averaging anisotropic interactions is observed showed decreases from 320 200 K, fraction capture increases 10 80%. incorporation accompanied by an increase consistent mechanism waxy
Language: Английский
Citations
7
Fuel, Journal Year: 2022, Volume and Issue: 324, P. 124289 - 124289
Published: May 6, 2022
Language: Английский
Citations
11
Fuel, Journal Year: 2022, Volume and Issue: 332, P. 126283 - 126283
Published: Oct. 15, 2022
Language: Английский
Citations
11
Analytical Letters, Journal Year: 2024, Volume and Issue: 57(18), P. 3050 - 3067
Published: Feb. 1, 2024
The global practice of blending bioethanol with petroleum fuels serves the dual purpose reducing fuel costs and mitigating vehicular emissions. However, variations from stipulated amount in can be detrimental to engine longevity performance. Notably, portable analytical devices capable swiftly accurately assessing samples without necessitating prior pretreatment have been developed by researchers. This review aims elucidate advances prevailing trends tools such as electrochemical, spectroscopic, electrical, optical fiber-based, physical parameter-based techniques for determination blended composition.
Language: Английский
Citations
2
ChemPlusChem, Journal Year: 2023, Volume and Issue: 88(5)
Published: May 1, 2023
A new complex of indium(III)chloride with etioporphyrin-I was synthesized and characterized. As naturally occurring extraligated etioporphyrins, the InCl-EtioP-I spectrum in solution has a very strong B-band more than an order magnitude weaker Q-band, but this difference diminishes solid films obtained by thermal evaporation vacuum. In solid, molecules have tight convex-convex arrangement 2D double layered structure interplane distance 3.066 Å. The conductivity can easily be activated action temperature or light. cells symmetrical lateral contacts photocurrent exceeds dark current about three orders magnitude, contribution photons Q-band range being greater expected from experimental calculated absorption spectrum. Q-bands contribute significantly to photovoltaic effect ITO/InCl-EtioP-I/Al sandwich cells. Such show untypically signal photodiode regime, which yields spectral detectivity 10^12 Jones.
Language: Английский
Citations
5
Bulletin of the Chemical Society of Japan, Journal Year: 2022, Volume and Issue: 95(11), P. 1553 - 1560
Published: Oct. 4, 2022
Abstract A nickel(II) complex of methyl pyropheophorbide-a bearing a vinyl group at the 3-position was treated with methanesulfonic acid in refluxing benzene to give smoothly corresponding 3-devinylated product. The 7- and 8-vinyl groups related chlorophyll-a/b derivatives were readily removed under same conditions, while 12-vinyl neighboring electron-withdrawing 13-keto carbonyl moiety hardly defunctionalized. devinylations blue-shifted all visible absorption bands dichloromethane. deethylation bathochromically moved redmost Qy maximum, dealkylations 7-, 8-, 12-positions hypsochromically Qy(0,0) maxima, which reproduced by time-dependent density functional theory calculation. Since no periphery free base counterparts mild nickel 3-unsubstituted deoxophylloerythroporphyrin geological samples would be produced via metalation chlorophylls-a/b/c from ancient phototrophs or their followed acidic 3-devinylation.
Language: Английский
Citations
7
Energies, Journal Year: 2022, Volume and Issue: 15(17), P. 6204 - 6204
Published: Aug. 26, 2022
The purpose of this work is to analyze the electron–nuclear interactions vanadyl-porphyrin (VP) complexes in oil asphaltenes. Asphaltenes from Athabasca sands were studied by HYperfine Sublevel CORrelation Spectroscopy (HYSCORE) electron paramagnetic resonance (EPR). It makes it possible resolve and interpret complex hyperfine spectra intrinsic VP with strong weak between magnetic moment various nuclear spins (1H, 14N, 51V). main parameters spin-Hamiltonian for spin system are determined. axially symmetric structure revealed, local environment center investigated. results can be used study asphaltene aggregates aim elucidating asphaltenes’ transformation(s) under influence external treatment.
Language: Английский
Citations
6
Fuel, Journal Year: 2022, Volume and Issue: 333, P. 126344 - 126344
Published: Oct. 19, 2022
Language: Английский
Citations
6