Exploring the Non-Covalent Bonding in Water Clusters

QTAIM and source function analysis were used to explore the non-covalent bonding in twelve different water clusters (H2O)(n) obtained by considering n = 2-7 and various geometrical arrangements. A total of seventy-seven O-HMIDLINE HORIZONTAL ELLIPSISO hydrogen bonds (HBs) were identified in the systems under consideration, and the examination of the electron density at the bond critical point (BCP) of these HBs revealed the existence of a great diversity of O-HMIDLINE HORIZONTAL ELLIPSISO interactions. Furthermore, the analysis of quantities, such as |V(r)|/G(r) and H(r), allowed a further description of the nature of analogous O-HMIDLINE HORIZONTAL ELLIPSISO interactions within each cluster. In the case of 2-D cyclic clusters, the HBs are nearly equivalent between them. However, significant differences among the O-HMIDLINE HORIZONTAL ELLIPSISO interactions were observed in 3-D clusters. The assessment of the source function (SF) confirmed these findings. Finally, the ability of SF to decompose the electron density (?) into atomic contributions allowed the evaluation of the localized or delocalized character of these contributions to ? at the BCP associated to the different HBs, revealing that weak O-HMIDLINE HORIZONTAL ELLIPSISO interactions have a significant spread of the atomic contributions, whereas strong interactions have more localized atomic contributions. These observations suggest that the nature of the O-HMIDLINE HORIZONTAL ELLIPSISO hydrogen bond in water clusters is determined by the inductive effects originated by the different spatial arrangements of the water molecules in the studied clusters.