Transition‐Metal Anions in Solids and Their Implications on Bonding

Abstract

A negative disposition: Electronic-band-structure calculations reveal that in La2M2In (M=Pt, Cu) the transition-metal atoms can be regarded as anions with fully occupied nd orbitals and bonding characters similar to that of the Ge3− ions in La2Ge2In. The orbital sequence in La2M2In is (n+1)s<nd<(n+1)p, as a result of the low oxidation states of the transition metals (see graph).