Coulombic stabilization energy

Moving toward the left of Fignre 3.10, the potential energy of the system decreases rapidly dne to the attractive Coulomb stabilization energy (the second term in Eq. 3.21), reaching a minimnm at the equilibrinm bond length, R = 2.17 A. If... 

Here, F is the Faraday constant, potentials of the donor and acceptor, respectively, Es is the singlet-state energy of the dye, and AEc is the coulombic stabilization energy. Typical dyes and coinitiators are presented in Tables 10.5 and 10.6, respectively. 

Problem 5.6 The molecular structure of KO2 (potassium superoxide) in sohd argon has been determined by vibrational spectroscopy. The molecule is T-shaped [2]. Can this result be understood if we assume the molecule to consist of K" " and O2 ions Hint The total electron density of the OJ ion is probably very similar to that of the F2 molecule. See Fig. 9.3. Where is the center of gravity of the negative charge on the anion Where would you place the cation to maximize the Coulomb stabilization energy ... 

Ey2 (D/D ), Ei/2 (A/A ) = oxidation and reduction potential of donor and acceptor, respectively Es = singlet-state energy of the sensitizer AEc = coulombic stabilization energy... 

If the assumption that the substituents do not cause any great change of electron distribution is valid, and if one assumes that as a first approximation it is only the inductive effect of the methyl groups which causes the change of the Coulomb integral, then the additional stabilization energy can be specified as... 

Dissociative Low-Energy Electron Attachment to the C-S Bond of H3CSCH3 Influenced by Coulomb Stabilization... 

Figure 3 Energies, as functions of the S-S bond length, of the parent charged polypeptide (top), of ground and excited-Rydberg states localized on the protonated amine side chain, and of the SS CT -attached state in the absence of (upper curve) and in the presence of (lower curve) Coulomb stabilization (appears as Figure 1 in ref. 3s).

A and that is sufficiently Coulomb stabilized by nearby positive charges to render positive its electron binding energy,... 

When the effective on-site Coulomb repulsive energy (Geff) of the solid composed of Tt-radical molecules is smaller than the bandwidth (W), then the solid becomes a half-filled metal provided that the molecules stack uniformly without dimerization and can be described by a band picture. So far, no such radical molecules have been prepared. In order to decrease Ues and stabilize radical molecules chemically, a push-pull effect and an extension of the re-system have been implemented, though a large U ff and high reactivity (polymerization) are stiU crucial for the metallic transport. Table 2 summarizes selected organic conductors of neutral 7t-radical molecules. 

Of the reactions listed in Table II, the only process that leads to a decrease of the energy of molecular oxygen is the formation of the free superoxide ion, Oj ( — 10.15 kcal/mol). The superoxide ion would therefore be expected to be the dioxygen species most commonly formed on oxide surfaces and in fact it is the species most studied, both in the bulk of various matrices and on surfaces. The other species (Oj and Oj ) are not stable in the gas phase, although they can be stabilized in the solid state (Table I) due to the additional coulombic stabilization from the lattice. 

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