Tags Bonding Hydrogen Hydrogen bonding Molecules Water In summary, when drawing hydrogen bonds between a water molecule and H3PO4 or acetic acid, the hydrogen bond is formed between the polarized hydrogen atom and either the oxygen or hydrogen atom of the compound. In the case of acetic acid,...
Figure 2-C-3.Hydrogen bonds.(a)The general form. D: donor; A: acceptor.(b)The hydrogen bond between two water molecules.(c)The hydrogen bond in a polypeptide, e.g., in an α helix or between two β strands.(d)The hydrogen bond between residue 45 (a threonine) of RNase A and i...
A hydrogen bond is a type of attractive (dipole-dipole) interaction between an electronegativeatomand ahydrogenatombondedto another electronegative atom. This bond always involves a hydrogen atom.Hydrogen bondscan occur betweenmoleculesor within parts of a single molecule. A hydrogen bond tends to be...
The energy required to break a hydrogen bond between two groups in vacuum is in the range of 25 kJ/mol for a peptide hydrogen bond [5,7]. However, in water, such exposed groups are more prone to create new hydrogen bonds with nearby water molecules, canceling the impact. Thus, the de...
Its unique ability to attract an exceptionally large number of hydrogen bonds induces the formation of a dense "hydrogen bond network" that has the potential to modify the properties of the surrounding molecules and their reactivities. The crucial role that water molecules play is described in this...
The strength of this dipole-dipole attraction (described in more detail here) is less than that of a normal chemical bond, and so it is completely overwhelmed by ordinary thermal motions in the gas phase. Hydrogen bonding in water But when the H2O molecules are crowded together in the liquid...
Proton affinities for SH and H 2 S, and, as their difference, the energy of the proton transfer between two H 2 S molecules, are also calculated. Despite the limited basis set used, the results are consistent with experimental data.
After many years of intensive experimental and theoretical studies, the water dimer is now a textbook example of hydrogen bonding. Not only its structure with a near-linear hydrogen bond and its binding energy are important, but also the observation that it has eight equivalent hydrogen-bonded equ...
A hydrogen bond (H-bond) is a partial intermolecular bonding interaction between a lone pair on an electron-rich atom, mainly the second-row elements fluorine, oxygen, or nitrogen, and the antibonding molecular orbital of H and a more electronegative atom. ...
For the structures possessing two hydrogen-bonds, the X–H···Y bond angles are between 119° and 166°. These values are within the X–H···Y bond angles range that is characteristic of hydrogen-bond complexes, thus indicating the formation of hydrogen-bond interactions in these ...