scholarly journals Identification of Polycyclic Aromatic Hydrocarbons

1987 ◽  
Vol 120 ◽  
pp. 557-558
Author(s):  
A. Léger ◽  
L. D'Hendecourt
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Organic Molecules ◽  
Polycyclic Aromatic ◽  
Small Grains ◽  
Ir Emission ◽  
Graphitic Material

The nature of the Very Small Grains evidenced by K. Sellgren (1985) is discussed. Their stability suggests that they are graphitic material and specifically Polycyclic Aromatic Hydrocarbons (PAHs). The expected IR emission of a typical PAH, coronene, gives an impressive spectroscopic agreement with the five observed “Unidentified IR Emission Features”, leading to an unambiguous identification. Those PAHs are the most abundant organic molecules detected to this date (f ~ 10−5).

scholarly journals Theoretical Modelling of the Infrared Fluorescence by Interstellar Polycyclic Aromatic Hydrocarbons

1992 ◽  
Vol 150 ◽  
pp. 137-138
Author(s):  
W. A. Schutte ◽  
A. G. G. M. Tielens ◽  
L. J. Allamandola
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Size Distribution ◽  
Aromatic Hydrocarbons ◽  
Theoretical Modelling ◽  
Polycyclic Aromatic ◽  
Ir Emission

We modelled the IR emission of interstellar PAHs. Substantial differences between the IR properties of interstellar and laboratory PAHs are found, possibly resulting from ionization. The various IR features being dominated by distinctly different size PAHs, their observed relative intensities are sensitive indicators of the size distribution. A number of applications of our model related to future ISO and SIRTF IR data are pointed out.

scholarly journals Application of Binary Diagnostic Ratios of Polycyclic Aromatic Hydrocarbons for Identification of Tsunami 2004 Backwash Sediments in Khao Lak, Thailand

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Siwatt Pongpiachan
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Marine Sediments ◽  
Aromatic Hydrocarbons ◽  
Organic Molecules ◽  
Three Dimensional ◽  
Diagnostic Ratios ◽  
Tsunami Deposit ◽  
Tsunami Deposits ◽  
Sedimentary Characteristics ◽  
Polycyclic Aromatic

Identification of Tsunami deposits has long been a controversial issue among geologists. Although there are many identification criteria based on the sedimentary characteristics of unequivocal Tsunami deposits, the concept still remains ambiguous. Apart from relying on some conventional geological, sedimentological, and geoscientific records, geologists need some alternative “proxies” to identify the existence of Tsunami backwash in core sediments. Polycyclic aromatic hydrocarbons (PAHs) are a class of very stable organic molecules, which can usually be presented as complex mixtures of several hundred congeners; one can assume that the “Tsunami backwash deposits” possess different fingerprints of PAHs apart from those of “typical marine sediments.” In this study, three-dimensional plots of PAH binary ratios successfully identify the Tsunami backwash deposits in comparison with those of global marine sediments. The applications of binary ratios of PAHs coupled with HCA are the basis for developing site-specific Tsunami deposit identification criteria that can be applied in paleotsunami deposits investigations.

scholarly journals Efficient synthetic methods for the installation of boron–nitrogen bonds in conjugated organic molecules

2016 ◽  
Vol 45 (14) ◽  
pp. 5920-5924 ◽  
Author(s):  
Matthew M. Morgan ◽  
Warren E. Piers
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Organic Molecules ◽  
Synthetic Methods ◽  
Conjugated Organic Molecules ◽  
Polycyclic Aromatic ◽  
Device Applications ◽  
Nitrogen Bonds ◽  
Boron Nitrogen

New synthetic methods for preparing gram quantities BN analogs of polycyclic aromatic hydrocarbons are highlighted. Such methods are key to proper evaluation of these materials in device applications.

The Assessment of Contamination and Source of Polycyclic Aromatic Hydrocarbons from the Sediments of the Someş River

2019 ◽  
Vol 64 (1) ◽  
pp. 55-67
Author(s):  
Vlad Pӑnescu ◽  
◽  
Mihaela Cӑtӑlina Herghelegiu ◽  
Sorin Pop ◽  
Mircea Anton ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic

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>

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