Centered Transitions

Comparison of the tanS curves (Figure 10b) results in similar conclusions the titanium containing TEOS-PTMO hybrids are distinctly different from the pure TEOS-PTMO hybrids. Both the 15 and 30wt% Ti materials exhibit broad tanS transitions centered at approximately -30°C while the comparable 0wt% Ti material exhibited a "sharper" tanS transition at approximately -5°C. Furthermore, the magnitude of the transitions decreased (from 0.5 to less than 0.2) upon the addition of titanium. The decrease in the magnitude of the glass transition could... 

Solutions of isolated dioxiranes, characteristically dimethyldioxirane (DMD) in acetone, possess a pale yellow color, which serves as a convenient analytical index for monitoring the dioxirane consumption in oxidation reactions and kinetic studies. For DMD, the absorption maximum (n-jt transition ) centers at ca 325 nm, with a molar extinction coefficient (e) of 12.5 0.5 M cm in acetone. The alternative and more rigorous analytical method for dioxirane quantification utilizes iodometry (Kl/starch). 

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Fluorescence of poly(phenylsilane) at room temperature was not detected. Poly(chlorophenylsilane) has a long wavelength tail out to 380 nm with a transition centered at 330 nm. Substitution of the Si-Cl bonds of the... 

Fig. 38. The agreement between simulated and experimental CD spectra for the PD complex was very good after a red-shift of 0.25 eV was applied to the excitation energies. Analysis of the computed spectrum showed the intense bands to originate predominately from n-to-n transitions within an extended n framework of the phosp-hole-helicene ligands. Unlike initially expected, the various bands in the CD spectrum cannot be assigned to transitions centered separately on the helicene and phosphole moieties, respectively. The experimentally measured molar rotation of the Pd complex was 23.1 103 deg cm2 dmol 1 2% in dichloromethane. For an analogous Cu complex it was 13.1 103 2%, a staggering 104 deg cm2 dmol 1 lower.

A detailed study between 80 and 300 K of the temperature dependence of the polarized reflection spectra of TEA(TCNQ)2 single crystals has been performed quite recently by Olejniczak and Graja [52]. The observed thermal evolution of the spectra is consistent with a wide semiconductor-to-semiconductor transition centered at about 220 K. The transition is... 

The duplexes differed only by the presence or absence of an abasic site at position X. In the absence of an abasic site, X becomes T, and the two strands can associate to form a fully paired Watson-Crick helix (referred to as thc/W duplex). Three abasic derivatives were created by placing different moieties in site X, each containing a synthetically modified 2-deoxyribose moiety (modified with either a tetrahydrofuran group, A F an ethyl group, A E or a propyl group, A P). HSDSC measurements showed that the A T duplex indicated a transition centered around... 

C, whereas the three abasic derivatives showed smaller transitions centered 60°C. In other words, the presence of an abasic site can decrease the stability, transition enthalpy, and transition entropy of a duplex structure compared with its Watson-Crick form. 

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