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Stacking herring-bone

Figure 4 Herring-bone stacking arrangement of the dimer units of the 4-phenyl-1,2,3,5-diselenadiazolyl... Figure 4 Herring-bone stacking arrangement of the dimer units of the 4-phenyl-1,2,3,5-diselenadiazolyl...
An x-ray crystallographic analysis of bcnzo[J,2,3- / 4,5,6-cV ]bis(thieno)[2,3-c]thiophene (61) demonstrated that the molecule is planar and symmetrical but has strained bond angles. The crystal structure comprises herring-bone type column stacking with intercolumnar heteroatom interactions. Compound (61) showed the same oxidation potential as perilene and, like perilene, formed an iodine complex with the relatively high electroconductivity of 0.11 S cm-1 <93BCJ2033>. [Pg.8]

The dominant intermolecular interactions in crystals of the smaller PAHs are between hydrogen atoms and carbon atoms, giving, as just described, a herring-bone structure. As the PAH becomes larger, the carbon-to-hydrogen ratio increases and intermolecular carbon-carbon interactions become relatively more important. The result is that the PAH molecules stack one above the other. These findings may be expressed by the potential energy expression - ... [Pg.648]

Cudzilo et al. and Huczko et al. noted that silicon and many silicides such as CaSi2 would yield nanofibrous mono-crystaUine SiC on reaction with PTFE [13,14]. Figure 15.10a,b shows the bulk of these fibres as obtained after purification steps. Figure 15.11a,b shows HRTEM of single SiC fibre with either stack or herring bone structure and amorphous SiO coating. [Pg.252]


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See also in sourсe #XX -- [ Pg.12 ]




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