Table 1. MEP Maxima (kcal/mol) on the 0.001 au Isodensity Surface of ZF₃ (Z = P, As, Sb, Bi) and HCN and CN^– Monomers, Calculated at the MP2/aug-cc-pVDZ Level of Theory.

molecule	VS,max (Z-F) σ-hole	VS,max π-hole below Z atom
PF3	35.6	9.7
AsF3	43.9	7.1
SbF3	51.6	10.6
BiF3	61.5	12.7

molecule	Vs,min
HCN	–31.4
NH3	–37.7
CN–	–137.7 (N) π
	–136.6 (N)
	–135.5(C)