[en] By the Hartree-Fock Roothaan method in CNDO/2 approximation equilibrium distances, binding energies and electronic density distribution for metalloporphyrin complexes Li⁺[PP]^2-, Na⁺[PP]^2-, Be²⁺[PP]^2- and Mg²⁺[PP]^2- with O₂, CO, OH^- and CN^- extraligands are calculated. It is shown that the interaction of oxygen molecule with metalloporphyrin containing Mg²⁺ ion, qualitatively differs from the interaction with other metalloporphyrins and extrligands. The calculations show that the binding energy ion-nitrogen alom of the porphyrin molecule which is equal for the ion 70 kJ/mol practically does not change in case of addition of extraligands