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Chemistry · Glossary

What is δ bond, quadruple bond?

Also known as: delta bond · quadruple bond

Definition 20.14 University Chemistry — Year 3 · Chapter 20 — Organometallic Chemistry: Bonding and Ligands

A δ\delta bond is a bond whose orbital has two nodal planes containing the internuclear axis, formed by the face-to-face overlap of two dd orbitals such as dxyd_{xy} and dxyd_{xy}. A quadruple bond combines one σ\sigma, two π\pi and one δ\delta bond between two metal atoms.

The component of the quadruple bond of [Re2Cl8]2-: the d_xy orbitals of the two rhenium atoms (four lobes each, signs blue and orange) face each other across the Re–Re axis, lobe over lobe of the same sign. The chlorides (green), eclipsed, lie along x and y, between the lobes.
The δ\delta component of the quadruple bond of [ReX2ClX8]X2−\ce{[Re2Cl8]^{2-}}: the dxyd_{xy} orbitals of the two rhenium atoms (four lobes each, signs blue and orange) face each other across the Re–Re axis, lobe over lobe of the same sign. The chlorides (green), eclipsed, lie along xx and yy, between the lobes.
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