The coulombic σ-hole model describes bonding in CX3I⋯Y− complexes completely

Abstract

Contrary to recent reports, the σ-hole interaction energies of complexes between the carbon tetrahalides CX₃I (X = F, Cl, Br, I) and halide anions Y⁻ (Y = F, Cl, Br, I) are described very well by the simple Coulombic σ-hole concept if it is applied properly. There is no need to invoke charge transfer, which in any case is not uniquely distinguishable from polarization.