Table 2.

Intramolecular charge-transfer stabilization energies (kJ·mol⁻¹) for complexes of C₃H₄O₂ with acids.

Complex	Olp1→σ*O–H	Olp2→σ*O–H	Total
Isolated monomer C3H4O2	16.9	105.5	122.5
C3H4O2:LiH at C=O	15.2	84.9	100.1
at O–H	21.0	162.5	183.6
C3H4O2:LiF at C=O	15.1	91.7	106.8
at O–H	20.7	157.7	178.4
C3H4O2:BeH2 at C=O	26.1	53.6	79.7
at O–H	22.9	168.6	191.5
C3H4O2:BeF2 at C=O	30.5	43.6	74.1
at O–H	24.1	188.7	212.8