A hydrogen bond is an attraction between two atoms that already participate in other chemical bonds. One of the atoms is hydrogen, while the other may be any electronegative atom, such as oxygen, chlorine, or fluorine. Hydrogen bonds may form between atoms within a molecule or between two sep...
An intramolecular hydrogen bond is exemplified by that in proteins and nucleic acids.DNA, for instance, has a double helical structure that is largely due to the hydrogen bonds between paired nitrogenous bases. Intermolecular and intramolecular hydrogen bonds may occur at the same time in a biologic...
Hydrogen bondsare a type of dipole-dipole interaction formed between any X group-attached proton, where X is an electronegative atom, and an electronegative atom (Y) containing a pair of nonbonded electrons. The importanthydrogen bondsoccur in molecules where X and Y are N, O, or F atoms [...
Find all the latest on hydrogen bonds at Medical Xpress. Your go-to source for news, research, and medical breakthroughs.
formation of hydrogen bonds between water molecules and oxygen-containing groups on the surface of NPs may weaken heteroaggregation arising from hydrogen bonding[47]. Hydrogen bonds (5–10kT) are generally stronger than common van der Waals bonds (~1kT) but weaker than typicalcovalent bonds(~100...
For single bonds between similar types of atoms, how does the strength of the bond relate to the size of the atoms? Explain. Explain the differences between the H-C-H bond angle in methane, CH4, and the bond angles in trichloromethane, CHCl3 (Be sure to co...
However, over three-quarters of these interactions are either the weaker components of bifurcated hydrogen bonds (so likely to be incidental contacts) or occur in structures where there is a clear insufficiency of good hydrogen-bond acceptors such as oxygen, nitrogen or halide. In structures where...
The energies of interaction are of an order of magnitude less than covalent bonds but greater than the very simple non-directional non-covalent forces (van der Waals or dispersion forces) that occur between all molecules. The unit A is generally oxygen, nitrogen or halogen but S–H and in ...
Low-barrier hydrogen bonds and enzymic catalysis Short, strong (low barrier) hydrogen bonds occur when the pK values of the atoms sharing the proton are similar. The overall distance is 2.5 Å or less, ... WW Cleland,MM Kreevoy - 《Science》 被引量: 1231发表: 2000年 Low-barrier hydrog...
What types of bonds exist between the atoms in a molecule of H2O? Which type of bond occur between bases in a DNA base-pair? a. covalent bonds b. ionic bonds c. hydrogen bonds What will happen if some of the hydrogen bonding capable groups such as C=O, O-H or N-H do not form...