Concept

Bond energy

In chemistry, bond energy (BE), also called the mean bond enthalpy or average bond enthalpy is a measure of bond strength in a chemical bond. IUPAC defines bond energy as the average value of the gas-phase bond-dissociation energy (usually at a temperature of 298.15 K) for all bonds of the same type within the same chemical species. 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 Do(R - X), is usually derived by the thermochemical equation, The enthalpy of formation ΔHfo of a large number of atoms, free radicals, ions, clusters and compounds is available from the websites of NIST, NASA, CODATA, and IUPAC. Most authors prefer to use the BDE values at 298.15 K. For example, the carbon–hydrogen bond energy in methane BE(C–H) is the enthalpy change (∆H) of breaking one molecule of methane into a carbon atom and four hydrogen radicals, divided by four. The exact value for a certain pair of bonded elements varies somewhat depending on the specific molecule, so tabulated bond energies are generally averages from a number of selected typical chemical species containing that type of bond. Bond energy (BE) is the average of all bond-dissociation energies of a single type of bond in a given molecule. The bond-dissociation energies of several different bonds of the same type can vary even within a single molecule. For example, a water molecule is composed of two O–H bonds bonded as H–O–H. The bond energy for H2O is the average of energy required to break each of the two O–H bonds in sequence: Although the two bonds are the equivalent in the original symmetric molecule, the bond-dissociation energy of an oxygen–hydrogen bond varies slightly depending on whether or not there is another hydrogen atom bonded to the oxygen atom. When the bond is broken, the bonding electron pair will split equally to the products.

Official source

https://en.wikipedia.org/wiki/Bond_energy

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Related courses (32)

CH-435: Asymmetric catalysis for fine chemicals synthesis

The asymmetric synthesis of fine chemicals is a research topic of growing importance for the synthesis of modern materials, drugs and agrochemicals. In this lecture, the concepts of asymmetric catalysis for fine chemical synthesis are introduced. ...

MSE-431: Physical chemistry of polymeric materials

The student has a basic understanding of the physical and physicochemical principles which result from the chainlike structure of synthetic macromolecules. The student can predict major characteristics of a polymer from its chemical structure and molecular ...

CH-431: Physical and computational organic chemistry

This course introduces modern computational electronic structure methods and their broad applications to organic chemistry. It also discusses physical organic concepts to illustrate the stability and reactivity of organic molecules. ...

Related lectures (32)

Chemical Bonds: Types and Properties

Explores various chemical bond types and interactions between atoms through electrons, emphasizing the significance of understanding these bond characteristics.

Chemical Bonding: Hybridization and Molecular Shape

Explores chemical bonding through hybridization, molecular shape, and bond characteristics.

Molecular Interactions: Atoms, Bonds, and DNA

Covers energy changes, hydrogen bonds, amino acids, DNA base pairing, and DNA replication.

Related publications (23)

Alcohol‐Directed Carboamination of Conjugated Enynes

We report a Pd‐catalyzed carboamination of conjugated enynes for the direct synthesis of functionalized allenic amines. The reaction proceeds through a selective 1,4‐coupling of anilines and aryl triflates with enynes, utilizing a free alcohol as a native directing group. The obtained allenes undergo versatile transformations, including cyclization to dihydropyrans, hydroamination, and tandem carboamination sequences. Notably, the use of primary anilines enables a second carboamination to generate multifunc

Wiley2026

Substituent engineering of dynamic covalent bonds enables simultaneous enhancement of performance and recyclability

Incorporating β-ketoester into dynamic oxime–urethane bond leads to enhanced intermolecular hydrogen bonding and a lowered equilibrium constant for bond dissociation, thus improving both the performance and recyclability of the resulting networks.

Royal Society of Chemistry (RSC)2026

Photocatalytic and Copper-Catalyzed 1,3-Aminoarylation of Aryl Cyclopropanes: Complementary Mechanistic Strategies for Synthesizing 3,3‑Diarylpropylamines

A regioselective 1,3-aminoarylation of aryl cyclopropanes is reported through two complementary catalytic strategies based on distinct reactivity. First, photoactivation of N-chloro-N-(phenylsulfonyl)benzenesulfonamide (NCBSI) enables a rapid and efficient 1,3-aminochlorination of aryl cyclopropanes. This transformation could be combined with a Friedel–Crafts arylation in a two-step, one-pot sequence, affording the corresponding arylated products bearing electron-rich arenes. Second, a copper-catalyzed prot

chemRxiv2026

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Official source

https://en.wikipedia.org/wiki/Bond_energy

About this result

Related courses (32)

CH-435: Asymmetric catalysis for fine chemicals synthesis

MSE-431: Physical chemistry of polymeric materials

CH-431: Physical and computational organic chemistry

Related lectures (32)

Chemical Bonds: Types and Properties

Explores various chemical bond types and interactions between atoms through electrons, emphasizing the significance of understanding these bond characteristics.

Chemical Bonding: Hybridization and Molecular Shape

Explores chemical bonding through hybridization, molecular shape, and bond characteristics.

Molecular Interactions: Atoms, Bonds, and DNA

Covers energy changes, hydrogen bonds, amino acids, DNA base pairing, and DNA replication.

Related publications (23)

Alcohol‐Directed Carboamination of Conjugated Enynes

Wiley2026

Substituent engineering of dynamic covalent bonds enables simultaneous enhancement of performance and recyclability

Royal Society of Chemistry (RSC)2026

Photocatalytic and Copper-Catalyzed 1,3-Aminoarylation of Aryl Cyclopropanes: Complementary Mechanistic Strategies for Synthesizing 3,3‑Diarylpropylamines

chemRxiv2026

Related people (30)

Harald Brune

Originaire de Münich en Allemagne, né en 1961, Harald Brune obtient son diplôme en physique de l'Université Ludwig Maximilians en 1989. Après une thèse en chimie physique à l'Institut Fritz-Haber de la Société Max-Planck à Berlin il obtient son titre de docteur ès sciences en 1992. Dès cela, il rejoint le groupe du Prof. K. Kern à l'Institut de physique expérimentale à l'EPFL. En 1995 il est chercheur invité à Copenhague travaillant en modélisation chez le Prof. J. Nørskov. De retour à l'EPFL, il se voit décerné le prix Latsis EPFL 1996 pour ses études par microscopie à effet tunnel de processus atomiques déterminants la croissance cristalline de couches minces. En 1998 il obtient son habilitation (venia legendi) en Physique et est nommé Maître d'enseignement et de recherche (MER) en nanophysique à l'EPFL. La même année il recoit une offre de Professeur Ordinaire (C4) de l'Université Philipps de Marburg. Début 1999 il réfuse cette offre et accepte un poste de Professeur Extraordinaire à l'EPFL et s'installe au sein de l'Institut de la Physique des Nanostructures. Il est nommé Professeur Ordinaire en 2005. Sa recherche porte sur les propriétés physiques (en particulier le magnétisme et la structure électronique) de nouvelles formes de la matière condensée comme des nanostructures et des couches ultra-minces. Il s'intéresse également à la catalyse hétérogène sur des systèmes inspirés dans leur composition et taille par celle des sites actives dans les enzymes en biologie. Il enseigne la Physique Générale pour ingénieurs, la Physique des matériaux solides pour physiciens, les méthodes expérimentales pour physiciens, ainsi que la Physique des surfaces, interfaces et nanostrcutures à l'école doctorale.

Cezar Zota

Teaching & PhD PhD Students Soujanya Madasu Past EPFL PhD Students as codirector Alberto Ferraris Courses Nanoscale MOSFETs and beyond CMOS devices MICRO-611 This course provides the trends in nanoelectronics for scaling, better performances and lower energy per function. It covers fundamental phenomena of nanoscale devices, beyond CMOS steep slope switches, emerging architectures, cryo electronics, non-volatile memories and energy efficient smart sensin

Jérôme Waser

Jérôme Waser biography and CV's are available on the following website: http://lcso.epfl.ch/waser

Jieping Zhu

Teaching & PhD PhD Students Morgane Elodie Marie Delattre, Paul Jean Gri, Clément Paul Adrien Rols, Yun Hao Shawn Teh Past EPFL PhD Students Jean-Baptiste Gualtierotti, Ala Bunescu, Thomas Buyck, Olivier Wagnières, Minh Tu Ha, Dylan Jean Robert Dagoneau, Antonin François Roland Clemenceau, Cyril Piemontesi, Nicolas David Gaeng, Mathias Mamboury, Raphaël Beltran, Balázs Budai, Teerawat Songsichan, Alexandre Julien Florent Leclair, Bastien Delayre, Rémi Julien Sylvain Andres, Dina Boyarskaya, Rémi Lavernhe,

Pierre-Etienne Bourban

Background 1990 Ingénieur en science des matériaux 1993 PhD in materials science Activities 1993-1994 Research at the Center for Composite Materials, University of Delaware, USA (ccm.udel.edu), SNSF grant Since 1994 Research and teaching at EPFL, Composites, (LTC, LPAC) 1995-1999 Coordination Swiss Priority Program on Materials research: 2.2: Composites Since 1998 Biocomposites 2004-2009 Direction of the EPFL Transdisciplinary programme in Sport and Rehabilitation 2005-2008 Member of the EPFL Vice-Presidency for Innovation and Valorisation and direction a.i.EPFL-LTC Since 2016 Direction Discovery Learning Labs Materials/Bioengineering and Engineering

Yury Tsybin

Xile Hu

Xile Hu was born in 1978 in Putian, southeastern China. He entered the Peking University in Beijing in 1996. Besides learning too little chemistry, his biggest regret in the college was not able to correct his southern accent in Mandarin. After graduated from PKU, he went to the United States and began his doctoral studies at the University of California, San Diego. In December 2004, he finished with a Ph.D. in chemistry and some fond memories of the beautiful city of San Diego. He then moved to the Los Angeles area and become a postdoctoral scholar at the California Institute of Technology. There he enjoyed numerous stimulating scientific (and other) discussions with friends and colleagues. He also made plenty of friends outside the campus and was a frequent in many local Chinese restaurants. In 2007, after two pleasant visits to Switzerland, he decided to move across the continent one more time and join the faculty of the École Polytechnique Fédérale de Lausanne (EPFL). He now directs the Laboratory of Inorganic Synthesis and Catalysis and is interested in developing chemistry for synthesis, energy and sustainability.

Enrique Corres Sojo

Teaching & PhD Courses TRC LC3 Research Platform Fribourg PENS-308 The UE TRC-LC3 Research Platform Fribourg will develop prototypes of structural elements in textile reinforced concrete (TRC) and Limestone Calcined Clay Cement (LC3) concrete that allow the continuation of the TRC prototype pavilion started at EPFL in 2019. The UE will take place in EPFL Fribourg.

Lothar Helm

Teaching & PhD Past EPFL PhD Students Oleg Yazyev, Loïck Moriggi, Gabriella Eva Bodizs, Hugues Jaccard, Bibimaryam Mousavi, Shima Karimi, Estel Canet Martinez Past EPFL PhD Students as codirector Meriem Benmelouka, Estel Canet Martinez

Frank Nüesch

Teaching & PhD PhD Students Elodie Didier, Ceren Mitmit, João Pedro Ferreira Assunção, Vahid Charkhesht Past EPFL PhD Students Hui Zhang, Simon Johannes Dünki, Yee Song Ko, Lei Wang, Sandra Christina Jenatsch, Nicolas Alexandre Serge Leclaire, Donatas Gesevicius, Surendra Babu Anantharaman, Markus Regnat, Philip Horst Caspari, Patrik Schürch, David Reber, Karen Verena Strassel, Sina Abdolhosseinzadeh, Matthias Diethelm, Francis Owusu, Camilla Arietta Vael-Garn, Yeerlan Adeli, Wei-Hsu Hu, Cansu Zeytun Kara

Related units (21)

Chair of Atomic Scale Simulation

ISIC - Divers

Laboratory of Computational Chemistry and Biochemistry

Related concepts (8)

Bond-dissociation energy

The bond-dissociation energy (BDE, D0, or DH°) is one measure of the strength of a chemical bond . It can be defined as the standard enthalpy change when is cleaved by homolysis to give fragments A and B, which are usually radical species. The enthalpy change is temperature-dependent, and the bond-dissociation energy is often defined to be the enthalpy change of the homolysis at 0 K (absolute zero), although the enthalpy change at 298 K (standard conditions) is also a frequently encountered parameter.

Fluorine

Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative reactive element, it is extremely reactive, as it reacts with all other elements except for the light inert gases. Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance.

Joule per mole

The joule per mole (symbol: J·mol−1 or J/mol) is the unit of energy per amount of substance in the International System of Units (SI), such that energy is measured in joules, and the amount of substance is measured in moles. It is also an SI derived unit of molar thermodynamic energy defined as the energy equal to one joule in one mole of substance. For example, the Gibbs free energy of a compound in the area of thermochemistry is often quantified in units of kilojoules per mole (symbol: kJ·mol−1 or kJ/mol), with 1 kilojoule = 1000 joules.

Related exercises (2)

Spring in a box

A closed box of mass M is resting on a table. Inside the box is a marble of mass m, attached to the lid by a spring with spring constant k and rest length l₀. What’s the minimal amplitude A of the marble’s vertical oscillation for the box to lift from the table? We assume l₀ and k to be large enough for the marble to avoid hitting the lid or the table before the box takes off. u2005 Indication: treat both the box and the marble as material points. The box will take of if its bonding force with the table

Pendulum in a rotating referential

A pendulum is composed of a material point P with weight mg⃗ and a massless thread of length L. The pendulum oscillates in a vertical plane that’s rotating around a fixed vertical axis that’s in the plane, with constant angular velocity ω⃗in the referential of inertia linked to the reference frame Ox₁x₂x₃ (see diagram). The pendulum is attached to a point A in the vertical plane, a distance R from the rotational axis. To describe the system, we use a rotating referential that’s linked to the reference frame

Related notebooks (2)

Wavepacket construction and propagation in 1D tight-binding model

"# Wavepacket construction and propagation along the 1D chain \n", "\n", "## Introduction\n", "In this notebook, we demonstrate the wavepacket construction and propagation, which is at the heart of the semiclassical approximation. For simplicty, we will consider the familiar 1D chain described using the tight-binding Hamiltonian. We will have to take a sufficiently large number of sites

N

and impose periodic boundary conditions. For simplicity, in the code below we assume lattice constant $a =

Classical Monte Carlo Simulations of the Ising Model on Square Lattice

"## Classical Monte-Carlo simulations of the Ising model on square lattice\n", "\n", "The Ising model considers the following Hamiltonian\n", "\n", "

\\hat{\\mathcal{H}} = -J\\displaystyle\\sum_{}\\sigma_i \\sigma_j

,\n", "\n", "in which spins

\\sigma_i

can take only two discrete values

\\sigma_i \\in \\{-1,+1\\}

. Below, we will consider spins on two-dimensional square lattice taking into account couplings

J

only for the nearest neighbor sites. For

J > 0

the ferromagneti