L. Bouslama et al., THEORETICAL-STUDY OF SPECIES FORMED BY I-A AND I-B METALS OR IONS ANDA CN LIGAND, Journal of molecular structure. Theochem, 330, 1995, pp. 187-190
Multireference second-order perturbation calculations have been carrie
d out for copper and sodium complexes involving one CN ligand. Neutral
compounds are strongly linked, cyanides M-CN being more stable than i
socyanides M-NC (M = Cu, Na) as in the case of the pair HCN/HNC. Catio
ns are much less strongly linked, Cu-NC+ being predicted to be the onl
y system having a fairly bound structure, at variance with the dominan
ce of the cyanide form in the HCN+/HNC+ pair.