Topic
Aromatic hydrocarbon
About: Aromatic hydrocarbon is a research topic. Over the lifetime, 5814 publications have been published within this topic receiving 55499 citations. The topic is also known as: arene & arenes.
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TL;DR: In this paper, the authors used the double focusing mass spectrometer (DFMS) onboard the Rosetta spacecraft and the laboratory twin model to derive the hydrocarbon bulk composition for the post-inbound equinox period at 1.52 AU in May 2015.
Abstract: Context. Unlike all previous cometary space missions, the Rosetta spacecraft accompanied its target, comet 67P/Churyumov-Gerasimenko, for more than two years on its way around the Sun. Thereby, an unexpected diversity and complexity of the chemical composition was revealed.Aims. Our first step of decrypting the exact chemical composition of the gaseous phase is the identifying and quantifying the bulk composition of the pure aromatic and aliphatic hydrocarbons.Methods. For this study, data from ROSINA–Double Focusing Mass Spectrometer (DFMS) onboard the Rosetta spacecraft and the laboratory twin model were used. A joint campaign of laboratory calibration measurements and space data analysis was performed to derive the hydrocarbon bulk composition for the post-inbound equinox period at 1.52 AU in May 2015. Furthermore, several other mission phases were investigated to determine the dependencies of season, location, and heliocentric distance on the relative abundances of hydrocarbons.Results. It is shown that the bulk composition of the gaseous phase includes a high number of aliphatic compounds such as methane, ethane, and propane, as well as the aromatic compounds benzene and toluene. Butane and pentane were successfully identified in measurements at closer distance to the comet in May 2016. Furthermore, the presence of hexane and heptane in the coma is confirmed on rare occasions during the mission. Their presence in DFMS space data appears to be linked to days or periods of high dust activity. In addition to the saturated aliphatic and aromatic compounds, a high number of remaining unsaturated species is present, which cannot be explained by fragmentation of saturated species or contribution from other organic molecules in addition to pure hydrocarbons. This indicates the existence of unsaturated aliphatic and aromatic hydrocarbon molecules in the coma of comet 67P.
32 citations
TL;DR: In this article, a series of copoly(methacrylates) with pendant phosphate and carbamoylphosphonate groups were synthesized, and the copolymer membranes were cross-linked by the chemical reaction of either ethylene glycol diglycidyl ether (EGDE) or toluene diisocyanate with hydroxyl or secondary amine groups in copolymers at 423 K.
32 citations
TL;DR: In this article, the main studies developed in recent years that seek to evaluate the potential of microporous materials in separating the different xylene isomers are presented. But they are based on the adsorption heat observed during their interaction with the adsorbent.
Abstract: Xylene is an aromatic hydrocarbon with a single ring and two methyl groups attached to this ring in positions 1-2, 1-3 and 1-4, called o-xylene, m-xylene, and p-xylene, respectively. Because of the similarities in their physicochemical properties, it is very difficult to obtain these isomers in a pure form. For this reason, numerous techniques have been developed with the objective of separating them. One technique is based on the adsorption of substances according to the adsorption heat observed during their interaction with the adsorbent. This review presents the main studies developed in recent years that seek to evaluate the potential of microporous materials in separating the different xylene isomers.
32 citations
TL;DR: A nonacyclic aromatic hydrocarbon 9,19‐dihydrodinaphtho[3,2,1‐de:3′,2′,1′‐op]pentacene, tethered with four 4‐hexylphenyl solubilizing groups is reported, achieving good power conversion efficiencies in DSCs.
Abstract: Continuous studies on the use of a polycyclic aromatic hydrocarbon as the central block of an organic photosensitizer have brought forth a new opportunity toward efficiency enhancement of dye-sensitized solar cells (DSCs). In this paper, a nonacyclic aromatic hydrocarbon 9,19-dihydrodinaphtho[3,2,1-de:3',2',1'-op]pentacene, tethered with four 4-hexylphenyl solubilizing groups is reported. The novel chromophore 9,9-19-19-tetrakis(4-hexylphenyl)-9,19-dihydrodinaphtho[3,2,1-de:3',2',1'-op]pentacene is further functionalized with diarylamines and 4-(7-ethynylbenzo[c][1,2,5]thiadiazol-4-yl)benzoic acid to produce two donor-acceptor (D-A) organic photosensitizers, achieving good power conversion efficiencies up to 10.2% in DSCs.
32 citations
TL;DR: X-ray analysis of the crystals shows that (+)- and (-)-bis-beta-naphthol and benzoquinone form a quinhydrone-type crystalline lattice with aromatic stacking and hydrogen bonding in which the third aromatic hydrocarbon component is accommodated.
32 citations