Dissociation energy, determination

An alkyl radical and a nitroxide radical exist in an equlibrium with the corresponding alkoxyamine as their coupling product (Eq. 57). Moad and Rizzardo [213] and Kazmaier et al. [214] independently estimated the effects of the structure of the alkyl group and the nitroxide on the dissociation energy of various alkoxyamines into the radicals by semiempirical molecular orbital calculations. The bond dissociation energies determined are summarized in Table 5 ... 

Table 11. Bond dissociation energies determined by electron impact methods. (kJ mol )...

Problem 6.4 without looking at a table of bond dissociation energies, determine which bond in each pair has the higher bond dissociation energy. 

Table 3- Bond dissociation energies determined by Armentrout and coworkers (unless otherwise noted) for meteoric metal oxides and the respective ions.

The dissociation energy determination and lattice energy calculation for C102" BF4"(c), with other thermodynamic data given in Table VIII, provide the enthalpy change... 

M-H Bond-dissociation Energies Determined in Solvents other than Acetonitrile... 

Davis and Okabe (1 ) have determined the dissociation energy of FCN to F(g) and CN(g) by measuring the threshold energies of incident photon radiation to produce B l CN which is monitored by its fluorescence. The dissociation energy determined by this technique is 111 kcal mol" with an uncertainty of about 1 kcal in the determination of the limit. 

H-abstraction reactions of chlorine atoms are often the basis of bond dissociation energy determinations, viz. 

The nature of the molecular ionization and the final state of the dissociated cation must be understood for quantitative applications of these principles. In Table I, the bond dissociation energies for several homonuclear diatomic molecules are calculated using Equation 4 and are compared to the dissociation energies found by spectroscopic means. The dissociation energy determined from ionization energies decreases from... 

Fig. 2). Using these results a kinetics model based on the Arrhenius equation, in which the activation energy was determined from a fitting a Morse potential using the bond dissociation energy determined from the calculations ... 

Interestingly, the potential is in general rather isotropic terms of only 10-20 cm" in anisotropy are evident, in contrast with an approximately 130 cm" dissociation energy determined from psuedodiatomic calculations for a one-dimensional radial well. What anisotropy exists in-... 

Table I. Bond Dissociation Energies Determined from HF Infrared Chemiluminescence. 

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