A delta bond involves sideways orbital overlap with two nodal planes containing the internuclear axis. In suitable metal-metal bonds, d-orbital overlap can supply this component in addition to sigma and pi bonding.
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A delta bond is a type of chemical bond that occurs in certain coordination complexes and is related to the interaction of d-orbitals in transition metal complexes. Delta bonding is usually considered in the context of molecular orbitals formed from d-orbitals. Specifically, it involves the overlap of the d-orbitals from central metal atoms with the d-orbitals of surrounding ligands, leading to a unique bonding arrangement.