02810 IUPAC Gold Book - heterolytic bond-dissociation energy 10.1351/goldbook.H02810 H02810 current 1 The energy required to break a given bond of some specific compound by heterolysis. For the dissociation of a neutral molecule $\ce{AB}$ in the gas phase into $\ce{A^{+}}$ and $\ce{B^{−}}$ the heterolytic bond-dissociation energy $D(\ce{A^{+}B^{−}})$ is the sum of the bond dissociation energy, $D(\ce{A–B})$, and the adiabatic ionization energy of the radical $\ce{A^{.}}$; minus the electron affinity of the radical $\ce{B^{.}}$. adiabatic https://goldbook.iupac.org//terms/view/A00141 bond dissociation https://goldbook.iupac.org//terms/view/B00698 bond-dissociation energy https://goldbook.iupac.org//terms/view/B00699 dissociation https://goldbook.iupac.org//terms/view/D01801 electron affinity https://goldbook.iupac.org//terms/view/E01977 heterolysis https://goldbook.iupac.org//terms/view/H02809 ionization energy https://goldbook.iupac.org//terms/view/I03199 PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1121 (https://doi.org/10.1351/pac199466051077) https://goldbook.iupac.org/terms/view/H02810/html https://goldbook.iupac.org/terms/view/H02810/json https://goldbook.iupac.org/terms/view/H02810/plain Citation: 'heterolytic bond-dissociation energy' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.H02810 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-06-30T05:10:32+00:00