![]() Replication of DNA strands is possible due to the presence of a hydrogen bond. ![]() The double-helical structure of DNA consists of hydrogen bonding between its base pairs. Recently there has been much interest in a special class of hydrogen bonds called 'strong' or 'low-barrier' and characterized by great strength, short distances, a low or vanishing barrier to hydrogen transfer, and distinctive features in the NMR spectrum. Carboxylic acids usually exist as dimeric pairs in non-polar media because of their tendency to “self-associate.” This tendency to hydrogen bond gives them increased stability as well as higher boiling points relative to the acid in an aqueous solution. Hydrogen bonds are a key feature of chemical structure and reactivity. In the hydrogen-bond definition we employ18,19, two water molecules separated by less than 3.5 A can be either bonded or not bonded, depending upon their. This helps them to participate in hydrogen bonding. The presence of the hydroxyl group makes it hydrogen bond donors. Due to the presence of the carbonyl group, it acts as a hydrogen bond acceptor. Hydrogen bond definition: a weak chemical bond between an electronegative atom, such as fluorine, oxygen, or. For example, intramolecular hydrogen bonding can be seen in the molecule of o-nitrophenol, whereas, p-nitrophenol shows intermolecular hydrogen bonding. An intermolecular attraction between a partially positively charged hydrogen in one molecule and a partially negatively charged oxygen, nitrogen, or fluorine in. This leads to the formation of a partial negative charge \(\left( \right)\) attached to the same carbon atom.Ĭarboxylic acids act as both hydrogen bond acceptors and donors. The bonding takes place between a functional group's hydrogen atom and the adjacent functional group's electronegative atom inside the same molecule. The making and breaking of hydrogen bonds profoundly affects the rates and dynamic equilibria, which are responsible for much of the biological activity of proteins. DEFINITION An electrostatic attractive force between the covalent bonded H- atom of one molecule and an electronegative atom (such as F,O,N ) of other molecule. As there is a large difference in the electronegativities of oxygen and hydrogen, the bonding pair of electrons lie very close to the oxygen atom. Hydrogen bonds are one of the major structural determinants, controlling active configurations by connecting protein structure in a fluxional equilibrium.
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