Abstract
The nature of the bonding between the two cobalt atoms in dicobalt hexacarbonyl diphenylacetylene is discussed in terms of simple molecular‐orbital theory. It is shown that, in addition to bonding via the π orbitals of the acetylene residue, it is essential to consider direct overlap between the 4p orbitals of the cobalt atoms. Master formulas and numerical tables are derived for the integrals S(4pσ4pσ), S(4pπ4pπ).

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