I like to know, in the case of cation-Pi interaction of the metal with the ligands/peptide  formed by the contribution of charge transfer or not? Actually, in more details, in NBO calculation, the orbital interaction between pi-carbon and metal could be affected or not? Since carbon is electron positive atom, therefore, I feel some confusing. But, in NBO calculation, I have found some significant amount of energy of second-order perturbation theory based on Fock matrix. So, I like to know, in different pattern of cation-Pi interaction of the metal, orbital interaction could be included or not??????

Please, help me, Sir/ Madam....

I am eagerly waiting for your kind reply...

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