Abstract
The ground state and 1B2 excited state of Cu(C2H4)+ and of CuX(C2H4) (X = F, Cl) have been investigated by the Hartree-Fock-Slater (HFS) method. The main metal-ligand interactions in the ground state are ethene π → Cu 4s donation and Cu 3dπ → ethene π* backdonation, which have comparable contributions
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