The chemical signature of intermolecular interactions was analyzed by the Atoms-in-Molecules (AIM) method . In this way, it was obtained the electron density (i) of the bond critical points (BCPs) connecting fragments through intermolecular bond paths and serves as a measure of the interaction strength. Under this framework, covalent bonds reach i values of 0.1-0.5 e/Bohr 3 (and depending on the polar bond character), coordinate and hydrogen bonds (closed-shell interactions) takes values of i0.04-0.10 e/Bohr 3 , and weak electrostatic interactions are characterized by ρi≤0.01 e/Bohr 3 . AIM, Mulliken charges, and wavefunction analyses were obtained in the Multiwfn 3.6 code .