Aromatic Hydrocarbon Cores

Debije MG, Piris J, de Haas MP, Warman JM, Tomoviae Z, Simpson CD, Watson MD, Mullen K. (2004) The optical and charge transport properties of discotic materials with large aromatic hydrocarbon cores. J Am Chem Soc 126 4641-4645. 

Mori, T, Takeuchi, H., Fujikawa, H. Field-effect transistors based on a polycyclic aromatic hydrocarbon core as a two-dimensional conductor. J. Appl. Phys. 97(6), 066102/1-066102/3 (2005). doi 10.1063/l.1862757... 

Debije, M.G., et al. The optical and chaige transpott properties of discotic materials with large aromatic hydrocarbon cores. J. Am. Chem. Soc. 126(14), 4641 4645 (2004). doi 10.1021/ja0395994... 

Flexible tubing for high pressure service, equipped with stainless steel overbraid plus tube adapter end connections, is commonly available with a carbon black-loaded PTFE core tube to dissipate static. Numerous other designs of conductive and antistatic tubing are available for low pressure applications. The utility of conductive tubing in preventing fires during transfer of aromatic hydrocarbon liquids is described in [165]. 

A surpnsing feature of the reactions of hexafluoroacetone, trifluoropyruvates, and their acyl imines is the C-hydroxyalkylation or C-amidoalkylaOon of activated aromatic hydrocarbons or heterocycles even in the presence of unprotected ammo or hydroxyl functions directly attached to the aromatic core Normally, aromatic amines first react reversibly to give N-alkylated products that rearrange thermally to yield C-alkylated products. With aromatic heterocycles, the reaction usually takes place at the site of the maximum n electron density [55] (equaUon 5). 

Sediment pollution. The concentrations of pollutants in the dated sediment cores have been determined in our laboratory by atomic absorption spectrophotometry (AAS). Donazzolo et al. (15) and Pavoni et al. (16) reported mainly heavy metal concentrations. Marcomini et al. (17) and Pavoni et al. (18) discussed the concentration profiles of organic pollutants such as chlorinated hydrocarbons and polycyclic aromatic hydrocarbons. 

Hydrocarbons. In other publications the historical trend of organic pollutant concentrations, namely polychlorinated biphenys (PCBs), chlorinated pesticides DDT and metabolites DDE, DDD, and polycyclic aromatic hydrocarbons (PAHs), have been reconstructed. For this purpose the sediments of the core sampled in the Lagoon area close to the industrial district were employed (16,17). 

McGroddy, S.E., Farrington, J.W. (1995) Sediment porewater partitioning of polycyclic aromatic hydrocarbons in three cores from Boston Harbor, Massachusetts. Environ. Sci. Technol. 29, 1542-1550. 

If solutions of CgQ in aromatic hydrocarbons are treated with Lewis acids, such as AICI3, AlBrj, FeBrj, FeClj, GaClj or SbClj, then a fullerylation of aromatics takes place (Scheme 8.11) [66, 88, 90, 91], In this case, the Lewis acid serves as a catalyst and increases the electrophilicity of the fullerene. Mixtures of polyarylated fullerenes are obtained. Depending on the reaction conditions and the aromatic used for the fullerylation, up to 16 aryl groups are covalently bound to the fullerene core [66, 88,... 

The reader may notice that only saturated hydrocarbons (with a possible exception of CCI4) have been observed to yield rapidly migrating solvent holes. As mentioned above, part of this bias is explained by the fact that the holes are usually short-lived, so their dynamic properties are difficult to study. However, in many liquids (such as aromatic hydrocarbons and sc CO2), the solvent holes are relatively stable, yet no rapid hole hopping is observed. In such liquids, the solvent hole has a well-defined dimer cation core with strong binding between the two halves (in the first place, it is this dimerization that... 

The M6X12 core (61 without terminal ligands) occurs in (3-Pd6Cl12235 and p-Pt6Cl12. These unique molecules are soluble in aromatic hydrocarbons, which probably function as electron donors to the metal atoms on the surface of the cluster.236 The same structure is proposed for the species [Bi OHJiJ6 on the basis of X-ray scattering from concentrated solutions, and vibrational spectra.237 The stoichiometry and the metal coordination stereochemistry are the same as those in the quite different cluster structure (6b). 

Aliphatic hydrocarbon solutes are primarily solubilized within the hydrocarbon core region of the surfactant micelles. Solubilization isotherms (activity coefLcient versus mole fraction, X) for these hydrophobic solutes exhibit curves that decrease from relatively large values at inLnite dilution to lower values as X increases toward unity (Figure 12.6). The aromatic hydrocarbons are intermediate in behavior between highly polar solutes, which are anchored in the micelle surface region, and aliphatic hydrocarbons, which preferentially solubilize in the hydrocarbon core region (Kondo et al., 1993). 

Heit M, Tan Y, Klusek C, et al. 1981. Anthropogenic trace elements and polycyclic aromatic hydrocarbon levels in sediment cores from two lakes in the Adirondack acid lake region. Water Air Soil Pollut 15 441-464. 

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