scholarly journals A three-armed cryptand with triazine and pyridine units: synthesis, structure and complexation with polycyclic aromatic compounds

2018 ◽  
Vol 14 ◽  
pp. 1370-1377 ◽  
Author(s):  
Claudia Lar ◽  
Adrian Woiczechowski-Pop ◽  
Attila Bende ◽  
Ioana Georgeta Grosu ◽  
Natalia Miklášová ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Aromatic Hydrocarbons ◽  
Molecular Modelling ◽  
Aromatic Compounds ◽  
Substitution Reaction ◽  
Polycyclic Aromatic Compounds ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Aromatic Nucleophilic Substitution ◽  
Polycyclic Aromatic ◽  
Aromatic Nucleophilic Substitution Reaction

The aromatic nucleophilic substitution reaction based synthesis of a three-armed cryptand displaying 2,4,6-triphenyl-1,3,5-triazine units as caps and pyridine rings in the bridges, along with NMR, MS and molecular modelling-based structural analysis of this compound are reported. Appropriate NMR and molecular modelling investigations proved the formation of 1:1 host–guest assemblies between the investigated cryptand and some polynuclear aromatic hydrocarbons or their derivatives.

scholarly journals Determination of Selected Polycyclic Aromatic Compounds in Particulate Matter Samples with Low Mass Loading: An Approach to Test Method Accuracy

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Susana García-Alonso ◽  
Rosa María Pérez-Pastor ◽  
Víctor Archilla-Prat ◽  
David Sanz-Rivera ◽  
Enrique Rojas-García ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Particulate Matter ◽  
Aromatic Hydrocarbons ◽  
Aromatic Compounds ◽  
Polycyclic Aromatic Compounds ◽  
Test Method ◽  
Intermediate Precision ◽  
Recovery Rates ◽  
Polycyclic Aromatic ◽  
Low Mass

A miniaturized analytical procedure to determine selected polycyclic aromatic compounds (PACs) in low mass loadings (<10 mg) of particulate matter (PM) is evaluated. The proposed method is based on a simple sonication/agitation method using small amounts of solvent for extraction. The use of a reduced sample size of particulate matter is often limiting for allowing the quantification of analytes. This also leads to the need for changing analytical procedures and evaluating its performance. The trueness and precision of the proposed method were tested using ambient air samples. Analytical results from the proposed method were compared with those of pressurized liquid and microwave extractions. Selected PACs (polycyclic aromatic hydrocarbons (PAHs) and nitro polycyclic aromatic hydrocarbons (NPAHs)) were determined by liquid chromatography with fluorescence detection (HPLC/FD). Taking results from pressurized liquid extractions as reference values, recovery rates of sonication/agitation method were over 80% for the most abundant PAHs. Recovery rates of selected NPAHs were lower. Enhanced rates were obtained when methanol was used as a modifier. Intermediate precision was estimated by data comparison from two mathematical approaches: normalized difference data and pooled relative deviations. Intermediate precision was in the range of 10–20%. The effectiveness of the proposed method was evaluated in PM aerosol samples collected with very low mass loadings (<0.2 mg) during characterization studies from turbofan engine exhausts.

The formation of aromatic hydrocarbons at high temperatures. XXVII. The pyrolysis of isoprene

1966 ◽  
Vol 19 (6) ◽  
pp. 1023 ◽  
Author(s):  
GM Badger ◽  
JK Donnelly ◽  
TM Spotswood
Keyword(s):  
High Temperatures ◽  
Aromatic Hydrocarbons ◽  
Aromatic Compounds ◽  
Polycyclic Aromatic Compounds ◽  
Polycyclic Aromatic

As a further contribution to the study of the mode of formation of polycyclic aromatic compounds in cigarette tar, the pyrolysis of isoprene at 700� has been investigated. A complex tar containing many aromatic hydrocarbons was obtained and mechanisms for the formation of these compounds are discussed. Isoprene may be an important precursor of polynuclear hydrocarbons in cigarette tar.

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