Intramolecular charge-inverted hydrogen bond

It is shown that the Siδ+Hδ-⋯⊃Al interaction, where '⊃' denotes the electron lone-pair vacancy, may exist if Siδ+Hδ- and ⊃Al subunits belong to the same molecule, i.e. they may form the intramolecular charge-inverted hydrogen bond. Its influence to the molecular geometry is studied by comparison with geometries of several reference systems. In studied molecules this kind of interaction is formed even if it leads to large structural deformations of the system and is even energetically profitable in the case of the presence of strong strain forces in the five-membered quasi-ring molecule.