scholarly journals Detection of the aromatic molecule benzonitrile (c-C6H5CN) in the interstellar medium

Science ◽  
2018 ◽  
Vol 359 (6372) ◽  
pp. 202-205 ◽  
Author(s):  
Brett A. McGuire ◽  
Andrew M. Burkhardt ◽  
Sergei Kalenskii ◽  
Christopher N. Shingledecker ◽  
Anthony J. Remijan ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Interstellar Medium ◽  
Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbons ◽  
Nitrogen Heterocycles ◽  
Aromatic Molecules ◽  
Polycyclic Aromatic ◽  
Hydrocarbon Formation ◽  
The Universe

Polycyclic aromatic hydrocarbons and polycyclic aromatic nitrogen heterocycles are thought to be widespread throughout the universe, because these classes of molecules are probably responsible for the unidentified infrared bands, a set of emission features seen in numerous Galactic and extragalactic sources. Despite their expected ubiquity, astronomical identification of specific aromatic molecules has proven elusive. We present the discovery of benzonitrile (c-C6H5CN), one of the simplest nitrogen-bearing aromatic molecules, in the interstellar medium. We observed hyperfine-resolved transitions of benzonitrile in emission from the molecular cloud TMC-1. Simple aromatic molecules such as benzonitrile may be precursors for polycyclic aromatic hydrocarbon formation, providing a chemical link to the carriers of the unidentified infrared bands.

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

scholarly journals Efficient and stable radiolabeling of polycyclic aromatic hydrocarbon assemblies: in vivo imaging of diesel exhaust particulates in mice

2019 ◽  
Vol 55 (4) ◽  
pp. 447-450 ◽  
Author(s):  
Chang Heon Lee ◽  
Ha Eun Shim ◽  
Lee Song ◽  
Hi Gyu Moon ◽  
Kyuhong Lee ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbons ◽  
Diesel Exhaust ◽  
In Vivo Imaging ◽  
Radioactive Iodine ◽  
Polycyclic Aromatic ◽  
Radioanalytical Method

As a robust radioanalytical method for tracking carbonaceous particulates in vivo, polycyclic aromatic hydrocarbons from diesel exhaust were labeled with a radioactive-iodine-tagged pyrene analogue.

scholarly journals Complete Genome Sequence of Pseudomonas putida BS3701, a Promising Polycyclic Aromatic Hydrocarbon-Degrading Strain for Bioremediation Technologies

2020 ◽  
Vol 9 (40) ◽  
Author(s):  
Andrey Filonov ◽  
Yanina Delegan ◽  
Irina Puntus ◽  
Leonid Valentovich ◽  
Artur Akhremchuk ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Pseudomonas Putida ◽  
Russian Federation ◽  
Aromatic Hydrocarbons ◽  
Complete Genome Sequence ◽  
Circular Chromosome ◽  
Content Type ◽  
Polycyclic Aromatic

ABSTRACT The strain Pseudomonas putida BS3701 was isolated from soil contaminated with coke by-product waste (Moscow Region, Russian Federation). It is capable of degrading crude oil and polycyclic aromatic hydrocarbons (PAHs). The P. putida BS3701 genome consists of a 6,337,358-bp circular chromosome and two circular plasmids (pBS1141 with 107,388 bp and pBS1142 with 54,501 bp).

scholarly journals Polycyclic aromatic hydrocarbon contamination in water, sediments and aquatic life of Nigerian inland and coastal waters

2021 ◽  
Vol 1 (3) ◽  
pp. 01-012
Author(s):  
Onome Augustina Bubu-Davies ◽  
Benjamin Bameyi Otene ◽  
Mpakaboari Vellington Cephas Ebini
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbons ◽  
Coastal Waters ◽  
Aquatic Organisms ◽  
Hydrocarbon Contamination ◽  
Aquatic Life ◽  
Polycyclic Aromatic ◽  
Public Monitoring

formed during incomplete combustions of organic substances but few to be mention such as cigarettes, coal etc. They are usually found as a mixture containing two or more compounds such as soot. The emissions of PAHs in Nigeria have contributed significantly to the environment and live of aquatic organisms. Thus, this paper reviewed the contamination of polycyclic aromatic hydrocarbon (PAHs) in the water, sediments and organisms in inland and coastal waters. Methodology: Literatures of relevant and previous studies of polycyclic aromatic hydrocarbons in the water, sediment and organism within and outside Nigeria were reviewed. Results: The contamination of polycyclic aromatic hydrocarbons (PAHs) was known to be carcinogenic, mutagenic, teratogenic and can cause adverse effect on human health, wildlife and aquatic lives with no report on mammals in the aquatic environments. Conclusion and Recommendation: Polycyclic aromatic hydrocarbons (PAHs) reviewed displayed different effects caused in the lives of human and aquatic organism based on the concentration level. Their sources were more of anthropogenic than natural source with varied concentrations at various source points due to different activities in question. The positive impact of polycyclic aromatic hydrocarbon on fish and other aquatic organisms as a result of bioconcentration, biotransformation and biomagnification become a threat to humans that rely on eighty percent of aquatic resources. Therefore, conceived efforts should be made to reduce these effects, general public monitoring of polycyclic aromatic hydrocarbon on discharge sources in the biosphere.

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