Filled Pentagons and Electron Counting Rule for Boron Fullerenes.

We have revisited the general constructing schemes for a large family of stable hollow boron fullerenes with 80 + 8n (n = 0, 2, 3, ...

Transition from moderate to strong hydrogen bonds: its identification and physical bases in the case of O-H...O intramolecular hydrogen bonds.

A systematic investigation aimed at identifying the transition from moderate (M) to strong (S) hydrogen bonds (HBs) and the physical bases of the main geometry-based HB strength classifications reported in the literature has been undertaken using the quantum theory of atoms in molecules (QTAIM). Correlations between the Laplacian of the electron density (rho) at the O..