Problems of the calculation of intermolecular interactions on complexes with strong delocalized π-bonds within the PCILO framework

Strong delocalized π-bonds must be approximated by localized π-bonds within the PCILO framework. From this approximation some difficulties result in the calculation of intermolecular interactions. If only one subsystem involves delocalized π-bonds the difficulties seem to be not very important. But if both subsystems involve such bonds, the PCILO results are not reasonable in some cases.