Benzene ionisation potential

However, because of the very similar ionisation potentials (and electrochemical oxidation potentials) of the precursors and products (e. g., benzene, 9.25 eV fluorobenzene, 9.21 eV p-difluorobenzene, 9.15 eV) selective mono-fluorination is often difficult to achieve. 

The magnitude of the benzene-induced upfield shifts in the acceptor alkenes increases with increasing ionisation potential of the alkene. No such relation was found between the downfield shifts of the donor alkenes and their ionization po-... 

Fig. 12. Vertical ionisation energies, Fermi (E.) and vacuum levels (V. L.) for gaseous (1), condensed and chemisorbed phases of (a) benzene, (b) acetylene and (c) ethylene, all plotted relative to cr-orbital ionisation potentials (I. P.) for the gas phase. Relaxation shifts are given by the vacuum level shifts while bonding shifts are given by relevant jr-orbital shifts. [Reproduced with permission from J. E. Demuth and D. E. Eastman, Phys. Rev. Letters 32, 1123 (1974)]...

Table Z Data of the photopolymerization of methyl methacrylate with ketone-amine initiator systems (IE = ionisation potential, 3k H = quenching constant of ketone triplet state with amine in benzene, AV/At = dilatometric contraction) [1]...

Benzene exhibits a lowest ionisation potential of 9.241 eV in the gas phase and an electronic level B. a little more than halfway between (4.72 eV = 38086 cm ) originating from the excitation of an e n-electron to an e n-orbital. If the spectral structures of the REMFI spectrum are compare to the LIF spectra observing the fluorescence from the intermediate state back to the ground state there is complete conformity of the spectral positions and no new peaks are found (Fig. 2). However, the ion yields of some excitation bands show considerable variations (>50%) which can be assigned to structures in the ionizing step. 

This simple method to calculate classical rates is conveniently illustrated by the deprotonation of the conjugated acid of azulene in aqueous solution, mechanism (13.XXIV). In the absence of data on the radical ion of azulene, we take the ionisation potential and electron affinity of the molecule, 7p = 7.42 eV and Ea = 0.79 eV, to calculate m = 1.238. The e,HA> Pba and HA,eq values of the two acidic C-H bonds of azulene can be taken from those of benzene. Using these parameters and eq. (13.89), we obtain AV, j = 56.1 kJ mol . With e,HA> Pha and /nA.eq... 

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