Pentacene INDEX

Fig. 7. Correlation of the UV spectra (in In units), In X(B), with connectivity index, x(T), (Eq. 11) for three homologous series of hydrocarbons 1 = benzene 5 = pentacene 6 = chrysene, 9 = L1A2(L2)jA2L1 10 = phenanthrene 13 = L1(L2)3A2L1. Circles correspond to beta absorption bands while triangles correspond to para bands...

Using the first peak of each pair of doublets, the peaks are indexed to a rectangular in-plane unit cell with dimensions a = 5.99 k,b = 7.66 A, and y = 90.0°. For 2, a similar in-plane unit cell was found with a = 5.98 k,b = 7.64 A, and y = 90.0°. There are two molecules per unit cell similar to the pentacene bulk crystal structure... 

Here pis the quantum efficiency of the sensitizer (ti = Tp/xp = l/3forpentacene)in the O4 site of p-terphenyl at 4 K, n is the index of refraction (n = 1.7 for the p-terphenyl crystal), and Na is the Avogadro s number. The integral in (H9) is calculated from the normalized fluorescence spectrum/(v) and the decadic molar extinction coefficient e(v) of pentacene at O4 site. The critical interaction distance is the sensitizer-activator separation for which the transfer rate is equal to the intrinsic decay time. Although derived for low temperatures. Equation H9 is also vaUd for arbitrary temperatures. In fact, the temperature dependence of the resonant energy transfer rate is contained in the spectral overlap integral. 

FIGURE 3.13 The colors of the molecular paths v. are determined by the CFD hierarchy within the Wiener indexing framework. Examples of t(x j reactive members are computed here for pentacene. Entry Kx)n parameters are considered... 

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