Bond dissociation energy properties, table

Physical Properties. Properties of some alkyl peroxyesters are Hsted in Table 13 and the properties of some alkyl areneperoxysulfonates are given in Table 14. Mass spectra (226), total energies, and dipole moments (227) oxygen—oxygen bond-dissociation energies (44,228) and boiling points, melting points, densities, and refractive indexes (44,168,213) have been reported for a variety of tert-huty peroxycarboxylates. 

Table 1 Physical properties and mean bond dissociation energies of some diorganozinc compounds...

Another characteristic property of organic halides is the bond dissociation energy. Table II lists bond energy values for carbon-halogen linkages... 

Table 1 summarizes the trends in the structures and bond dissociation energies of hydrides (MH , n = 1, 2 and 3 for M = As, Sb and Bi) calculated with the CASSCF/CI method together with the available experimental data. The spectroscopic properties and potential energy curves for monohydrides (MH) have been fully summarized by Balasubramanian. Even for simple hydrides, there are only few experimental data for comparison. As Table 1 shows, however, good agreement is seen between the calculated and limited experimental values. This will permit the periodic trends to be discussed on the basis of the calculated values. 

Values of average dissociation energies in text Table 2.4 are actually those for the property of bond enthalpy (see Chapter 6), measured at 298.15 K. The bond dissociation energies of diatomic molecules given in Table 2.3 apply at 0 K (absolute zero). 

Generalized to any type of carbon-centered radical, this approach has led to use of C—H bond dissociation energies for estimating the unpaired electron delocalization energies of these species. As shown in Tables XXXIII, XXXIV, and XXXV, bond dissociation energies which, except for a constant, are equal to heats of reaction do not provide satisfactory resonance (or stabilization) energies of free radicals. Indeed, as stated before, a heat of reaction can never be used for determining any property of one of the species involved in that reaction. 

As the localized charge concept, the electronegativity concept has been the subject of several definitions [e.g. 28,29], The earliest definitions, due to Pauling [30] and Mulliken [31], involve thermodynamic or spectroscopic properties, respectively. In Pauling s scheme [30,32] electronegativities are introduced as a set of differences Xa Xb between atoms A and B of the periodic table defined from single-bond dissociation energies D(X - T) (X, Y = A, B) as ... 

To use the cycle, you need to consider four properties that can be looked up in a data Table such as the ionization energy, electronic affinity, bond dissociation energies, and the heats of atomization. 

Frigden [429] has addressed the underlying causes of the differing hydrohalide acidities in terms of the physical properties of the compounds. As shown in Table 7.2, several properties such as the trend to lower bond dissociation energies (BDEs) and smaller differences in X-H electronegativi-ties fAri ) as one proceeds down a group in the periodic table are consistent... 

In order to explain the rationale behind such regioselective bcmd cleavage, the reactivity of the two bonds under consideraticMi must be taken into account. The reaction is governed by the inherent electrcMiic properties of the bonds, their bond dissociation energies, and by the nature of the reacting partner. Table 3.1 summarizes the reported bond dissociation energies (BDE) for some C-H, C-C and C-O bonds relevant to this reaction. 

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