Square Planar Pt(II) Ion as Electron Donor in Pnictogen Bonding Interactions

It has been proposed that late transition metals with low coordination numbers (square planar or linear) can act as nucleophiles and participate in ?-hole interactions electron donors. This is due to the existence, this type of metal complexes, a pair electrons located at high energy d-orbitals (dz2 dx2-y2), which are adequate for interacting antibonding ?-orbitals [?*(X–Y)] where Y usually an withdrawing element X p-block. d[M]??*(X–Y) interaction reported groups 9–11 oxidation states +1 +2 (d8 d10) donors ?-holes halogen chalcogen atoms acceptors. To our knowledge, it not described pnictogen atoms. In manuscript, evidence existence bonding involving square Pt(II) donor Sb acceptor provided by using X-ray structure retrieved from Cambridge Structural Database (CSD) theoretical calculations. particular, quantum theory molecules (QTAIM), noncovalent plot (NCIPlot) molecular electrostatic potential (MEP) methods were used. Moreover, further confirm nature Sb···Pt(II) contact, recently developed method was used density (ED) (ESP) distribution compared along bond path.