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E CPint for the π-complex of SnH2 with benzene (left) and the σ-complex of SnH2 with pyridine (right) as a function of the geometrical parameter d. Fourteen DFT methods were combined with the aug-cc-pVTZ basis set. The E CPint curves obtained at the CCSD(T)/aug-cc-pVTZ level are also shown for comparison
