Poly ionization potential

Platinum-cobalt alloy, enthalpy of formation, 144 Polarizability, of carbon, 75 of hydrogen molecule, 65, 75 and ionization potential data, 70 Polyamide, 181 Poly butadiene, 170, 181 Polydispersed systems, 183 Polyfunctional polymer, 178 Polymerization, of butadiene, 163 of solid acetaldehyde, 163 of vinyl monomers, 154 Polymers, star-shaped, 183 Polymethyl methacrylate, 180 Polystyrene, 172 Polystyril carbanions, 154 Potential barriers of internal rotation, 368, 374... 

Related Polymer Systems and Synthetic Methods. Figure 12A shows a hypothetical synthesis of poly (p-phenylene methide) (PPM) from polybenzyl by redox-induced elimination. In principle, it should be possible to accomplish this experimentally under similar chemical and electrochemical redox conditions as those used here for the related polythiophenes. The electronic properties of PPM have recently been theoretically calculated by Boudreaux et al (16), including bandgap (1.17 eV) bandwidth (0.44 eV) ionization potential (4.2 eV) electron affinity (3.03 eV) oxidation potential (-0.20 vs SCE) reduction potential (-1.37 eV vs SCE). PPM has recently been synthesized and doped to a semiconductor (24). 

S. Janietz, D.D.C. Bradley, M. Grell, C. Giebeler, M. Inbasekaran, and E.P. Woo, Electrochemical determination of the ionization potential and electron affinity of poly(9,9-dioctylfluorene), Appl. Phys. Lett., 73 2453-2455, 1998. 

Figure 6.5 Relationship of ionization potential to van der Waals volume. Compounds , alkylbenzenes, and, poly chlorobenzenes. Number beside symbols see Table 6.4.

A number of poly(arylene vinylene) (PAV) derivatives have been prepared. Attachment of electron-donating substituents, such as dimethoxy groups (structure 19.3), acts to stabilize the doped cationic form and thus lower the ionization potential. These polymers exhibit both solvatochromism (color changes as solvent is changed) and thermochromism (color is temperature-dependent). 

There has been a great deal of interest since the mid 1970s in photoelectron spectrometry and the ionization potentials of various A,B-diheteropentalenes have been summarized <84CHEC-I(4)1037>. The photoelectron spectrum of thieno[3,2-6]thiophene (12) was measured in the solid state as well as in the gas phase and has been investigated in comparison with linearly polycondensed poly thiophenes, (66) and (67) <92JCS(P2)765>. 

PRADO AND HOWARD Hydfocarbon Ions in Sooting Flames 165 Table A-I. Ionization Potential of Poly aromatic Molecules... 

For poly(9,9-di-n-octylfluorene) (PFO), which is deemed a model polymer in PFs, Janietz and coworkers reported its HOMO (equivalent to ionization potential, Ip) and LUMO (equivalent to electron affinity, Ea) levels as 5.8 and 2.12 eV below the vacuum level, respectively, as determined from cyclic voltammetry (CV) measurements of PFO thin solid film [11] as shown in Fig. la. However, the HOMO and LUMO levels provide a larger band gap of 3.68 eV than the value of 2.95 eV determined from the onset position in the ultraviolet-visible (UV) absorption spectrum of PFO film. If the band gap is taken as 2.95 eV and the HOMO level as 5.8 eV, the LUMO level of PFO... 

A special problem in the application of the polymer theory is the knowledge of the equilibrium constant of the poly-condensation reaction A n. The values of the dimerization constants in some binary Me0-Si02 systems (M = Ca, Mn, Pb, Fe, Co, Ni) were calculated by Masson (1977). Balta and Balta (1971) found a linear relationship between the logarithm of the equilibrium constant and the ionization potential of the metallic cation, which allows estimation of the equilibrium constant in systems, where the experimental data are missing, e.g. for cations with a ionization potential close to the second ionization potential of Mg, Masson (1977) published for Mn at 1773 K and Pb at 1273 K the values of the equilibrium constant Ku = 0.19 K and Ku = 0.196, respectively. 

This peak potential also fits the linear correlation established between pola-rographic oxidation half-wave potentials for substituted aromatic compounds and their ionization potentials [161]. It should be noted that the radical cation of 66 may be either a 7r-delocalized or S,S 2c, 3e o species. Compound 67 shows a reversible first oxidation potential in acetonitrile with E1/2=0.87 V vs SCE [162]. Perylene derivative 68 exhibits a first oxidation peak in nitrobenzene at 0.65 V vs Ag/AgCl [163]. Because of the good thermal stability and high electrical conductivity of the radical cation of 68 [164], functionalized analogues have also been prepared and studied [165]. Poly(alkylthio)pyracyclene has been studied [166]. 

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