Chemical bonding involving d-orbitals

Abstract

The landmark 1954 J. Chem. Soc. paper by Craig et al. exploring the role of d-orbitals in chemical bonding is discussed. This paper set the agenda for discussions that continue until the present about topics in inorganic chemistry such as hypervalency, arguably the most significant bonding phenomenon to differentiate the chemistry of the 2p main group elements from their heavier congeners.