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BOND DISSOCIATION ENERGIES

Jin-Pei Cheng

The bond dissociation energy (enthalpy) is also referred to as bond disruption energy, bond energy, bond strength, or binding energy (abbreviation: BDE, BE, or D). It is defined as the standard enthalpy change of the following fission: R−X → R + X. The BDE, denoted by D°(R−X), is usually derived by the thermochemical equation, D°(R−X) = Δ_fH° (R) + Δ_fH°(X) – Δ_fH°(RX). The enthalpy of formation Δ_fH° of a large number of atoms, free radicals, ions, clusters, and compounds is available from the Web sites of NIST, NASA, CODATA, and IUPAC. Most authors prefer to use the BDE values at 298.15 K.

The following seven tables provide essential information of experimental BDE values of R−X and R⁺−X bonds. The data in these tables have been revised through September 2021.

Table 1: Bond Dissociation Energies in Diatomic Molecules
Table 2: Enthalpy of Formation of Gaseous Atoms
Table 3: Bond Dissociation Energies in Polyatomic Molecules
Table 4: Enthalpies of Formation of Free Radicals and Other Transient Species
Table 5: Bond Dissociation Energies of Some Organic Molecules
Table 6: Bond Dissociation Energies in Diatomic Cations
Table 7: Bond Dissociation Energies in Polyatomic Cations

Bond Dissociation Energies in Diatomic Molecules

The BDEs in diatomic species have usually been measured by spectroscopy or mass spectrometry. In the absence of data on the enthalpy function, the values at 0 K, D°(A−B), are converted to D°₂₉₈ by the approximate equation:

D°₂₉₈(A−B) ≈ D°(A−B) + (3/2)RT = D°(A−B) + 3.7181 kJ mol^–1

Column definitions for Table 1 are as follows.

Column heading	Definition
Mol. form.	Molecular formula for diatomic molecule A–B; table has been arranged in alphabetical order of atom A
D°₂₉₈	Bond dissociation energy, in units kJ mol^-1
Ref.	Reference number

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TABLE 1. Bond Dissociation Energies in Diatomic Molecules

Mol. form.	D°₂₉₈/kJ mol^–1	Ref.
Continued on next page...
Ac−O	794	1
Ac–S	505 ± 68	22
Ag−Ag	162.9 ± 2.9	1
Ag−Al	183.7 ± 9.2	1
Ag−Au	202.5 ± 9.6	1
Ag−Bi	192 ± 42	1
Ag−Br	280.3 ± 1.3	1
Ag−Cl	279.1 ± 8.4	1
Ag−Cu	171.5 ± 9.6	1
Ag−D	226.8	1
Ag−Dy	130 ± 19	1
Ag−Eu	127 ± 13	1
Ag−F	356.9 ± 5.8	1
Ag−Ga	159 ± 17	1
Ag−Ge	174.5 ± 21	1
Ag−H	202.4 ± 9.1	1
Ag−Ho	124 ± 19	1
Ag−I	234 ± 29	1
Ag−In	166.5 ± 4.9	1

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BOND DISSOCIATION ENERGIES

Bond Dissociation Energies in Diatomic Molecules

TABLE 1. Bond Dissociation Energies in Diatomic Molecules

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