Results 21 to 30 of about 71,492 (345)

Direct C2–H alkylation of indoles driven by the photochemical activity of halogen-bonded complexes

Beilstein Journal of Organic Chemistry, 2023
A light-driven metal-free protocol for the synthesis of sulfone-containing indoles under mild conditions is reported. Specifically, the process is driven by the photochemical activity of halogen-bonded complexes formed upon complexation of a sacrificial ...
Martina Mamone, Giuseppe Gentile, Jacopo Dosso, Maurizio Prato, Giacomo Filippini   +4 more
doaj   +1 more source

High-spectral-resolution Fabry-Pérot interferometers overcome fundamental limitations of present volcanic gas remote sensing techniques

Frontiers in Earth Science, 2023
Remote sensing (RS) of volcanic gases has become a central tool for studying volcanic activity. For instance, ultraviolet (UV) skylight spectroscopy with grating spectrographs (GS) enables SO2 (and, under favourable conditions, BrO) quantification in ...
Jonas Kuhn, Jonas Kuhn, Nicole Bobrowski, Nicole Bobrowski, Guillaume Boudoire, Guillaume Boudoire, Sergio Calabrese, Sergio Calabrese, Giovanni Giuffrida, Marco Liuzzo, Katcho Karume, Dario Tedesco, Dario Tedesco, Thomas Wagner, Ulrich Platt, Ulrich Platt   +15 more
doaj   +1 more source

Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHC [PDF]

Geoscientific Model Development, 2023
The atmospheric chemistry of halogenated species (Cl, Br, I) participates in the global chemical sink of tropospheric ozone and perturbs the oxidising capacity of the troposphere, notably by influencing the atmospheric lifetime of methane.
C. Caram, S. Szopa, A. Cozic, S. Bekki, C. A. Cuevas, A. Saiz-Lopez   +5 more
doaj   +1 more source

Evidence for an Active, Transcrustal Magma System in the Last 60 ka and Eruptive Degassing Budget (H2O, CO2, S, F, Cl, Br): The Case of Dominica

Geochemistry, Geophysics, Geosystems, 2020
The Morne Trois Pitons‐Micotrin volcanic complex on the island of Dominica (Lesser Antilles) emitted a series of plinian eruptions between 18 and 9 ka BP.
T. d'Augustin, H. Balcone‐Boissard, G. Boudon, C. Martel, E. Deloule, P. Bürckel   +5 more
doaj   +1 more source

Probing halogen–halogen interactions in solution [PDF]

Physical Chemistry Chemical Physics, 2017
Weak but measurable: a supramolecular balance detects interactions between CBr3groups in solution and estimates the corresponding free energy (0.2 kJ mol−1).
Ayzac, V., Raynal, Matthieu, Isare, B., Idé, J., Brocorens, P., Lazzaroni, R., Etienne, T., Monari, A., Assfeld, Xavier, Bouteiller, Laurent   +9 more
openaire   +3 more sources

Preparo de amostras de combustíveis fósseis por piroidrólise para a determinação de flúor e cloro Fluoride and chloride determination in fossil fuels after sample preparation by pyrohydrolysis

Química Nova, 2010
Pyrohydrolysis is proposed for fossil fuels sample preparation for further fluorine and chlorine determination. Samples were heated during 10 min at temperatures up to 1000 °C.
Fabiane G. Antes, Fábio A. Duarte, Éder L. M. Flores, José Neri G. Paniz, Érico M. M. Flores, Valderi L. Dressler   +5 more
doaj   +1 more source

Defect Processes in Halogen Doped SnO₂

Applied Sciences, 2021
In the present study, we performed density functional theory calculations (DFT) to investigate structural changes and their impact on the electronic properties in halogen (F, Cl, Br, and I) doped tin oxide (SnO2).
Petros-Panagis Filippatos, Nikolaos Kelaidis, Maria Vasilopoulou, Dimitris Davazoglou, Alexander Chroneos   +4 more
doaj   +1 more source

Intramolecular halogen–halogen bonds?

Physical Chemistry Chemical Physics, 2013
By analysing the properties of the electron density in the structurally simple perhalogenated ethanes, X3C-CY3 (X, Y = F, Cl), a previously overlooked non-covalent attraction between halogens attached to opposite carbon atoms is found. Quantum chemical calculations extrapolated towards the full solution of the Schrödinger equation reveal the complex ...
Johansson, Mikael P., Swart, Marcel
openaire   +5 more sources

Composition of minerals (apatite, magnenite, ilmenite and others) as an index of conditions of layered massive ore formation in the laminated gabbro of Kusa intrusion (the Southern Urals)

Литосфера, 2019
Research subject. In this research, we carried out a series of mineralogical, petrological and geochemical studies to investigate ore zones present in the Kusa ilmenite-magnetite deposit located within the boundaries of a similarly-named laminated gabbro
T. D. Bocharnikova, V. V. Kholodnov, Y. S. Shagalov   +2 more
doaj   +1 more source

Analysis of products from the pyrolysis of plastics recovered from the commercial scale recycling of waste electrical and electronic equipment [PDF]

, 2007
Three plastic fractions from a commercial waste electrical and electronic equipment (WEEE) processing plant were collected and investigated for the possibility of recycling them by batch pyrolysis. The first plastic was from equipment containing cathode
Hall, W.J., Williams, P.T.
core   +1 more source