Anion-ligand interactions: ab initio study of the binding of H2O,CO2 and SO2 to the nitrite ion

Binding enthalpies of single attachment of H₂O, CO₂ and SO₂ to NO^?₂ in the gas phase are reproduced with striking accuracy by SCF ab initio computations using a minimal basis set with counterpoise correction. The positions of binding to NO^?₂ are predicted. The charge-transfer character of the binding, small for water, is slightly increased for CO₂ and appreciable for SO₂.