A three-center two-electron (3c–2e) bond is an electron-deficient chemical bond where three atoms share two electrons. The combination of three atomic...

A 4-center 2-electron (4c–2e) bond is a type of chemical bond in which four atoms share two electrons in bonding, with a net bond order of 1⁄2. This type...

The 3-center 4-electron (3c–4e) bond is a model used to explain bonding in certain hypervalent molecules such as tetratomic and hexatomic interhalogen...

metal-to-metal bonding, agostic interactions, bent bonds, three-center two-electron bonds and three-center four-electron bonds. The term covalent bond dates from...

are two types of three-center bonds: Three-center two-electron bond, found in electron-deficient compounds such as boranes Three-center four-electron bond...

atoms share two electrons. Other types include the double bond, the triple bond, one- and three-electron bonds, the three-center two-electron bond and three-center...

two lone pairs and two bond pairs. The four electron pairs are spread so as to point roughly towards the apices of a tetrahedron. However, the bond angle...

pair of valence electrons that are not shared with another atom in a covalent bond and is sometimes called an unshared pair or non-bonding pair. Lone pairs...

aromaticity" or homoaromaticity. This four-center two-electron bond involves one pair of electrons delocalized among the four bridgehead atoms. Most reactions...

"Exceptionally Long (2.9 Å) C–C Bonds between [TCNE]− Ions: Two-Electron, Four-Center π*–π* C–C Bonding in π-[TCNE]22−". Angewandte Chemie International Edition...