Fig. 3. The shape of the deformation density of Δρ₍₁₎, which is associated with ΔE_orb(1) in kcal mol⁻¹ calculated at the BP86(D3BJ)/TZ2P level; relativistic effects were considered with ZORA. It presents mainly the donation of electron density from the M–M σ-bond to the empty 5s orbital of Ag⁺. The eigenvalue ν₁ gives the value of the charge migration. The direction of the charge flow is from red to blue. Colour code: carbon – grey, oxygen – red, ruthenium – turquoise.