hydrogen bonding


Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia.

hydrogen bonding

the attractive force of compounds in which a hydrogen atom covalently linked to an electronegative element such as oxygen, nitrogen, or fluorine has a large degree of positive character relative to the electronegative atom, thereby causing the compound to possess a large dipole and to associate strongly with other like molecules.

hydrogen

a chemical element, atomic number 1, atomic weight 1.00797, symbol H. See Table 6. It exists as the mass 1 isotope (protium, or light or ordinary hydrogen), mass 2 isotope (deuterium, heavy hydrogen), and mass 3 isotope (tritium).

hydrogen bonding
weak electrostatic attraction between one electronegative atom and the hydrogen atom covalently linked to a second electronegative atom.
hydrogen breath test
detects hydrogen production as a product of bacterial fermentation of carbohydrates, an indicator of inflammatory bowel disease or carbohydrate malabsorption.
hydrogen cyanide
hydrocyanic acid.
heavy hydrogen
hydrogen having double the mass of ordinary hydrogen; deuterium.
hydrogen ion balance
hydrogen ion concentration
the degree of concentration of hydrogen ions (the acid element) in a solution. Its symbol is pH, and expresses the degree to which a solution is acidic or alkaline. The pH range extends from 0 to 14, pH 7 being neutral. A pH of less than 7 indicates acidity, above 7 indicates alkalinity. See also acid-base balance and ph.
hydrogen peroxide
H2O2, used in solution as an antibacterial agent. A 3% solution foams on touching skin or mucous membrane and appears to have a mechanical cleansing action.
hydrogen peroxide-based teat dips
hydrogen sulfide
an ill-smelling, colorless, poisonous gas, H2S; much used as a chemical reagent. Hydrogen sulfide is often present in gases from oil wells and from manure vats under slatted floor barns. Poisoning of cattle causes diarrhea, dehydration, dyspnea and death in convulsions. The feces are black and the breath smells of hydrogen sulfide. Called also hydrosulfuric acid. See also manure pit gas poisoning.
hydrogen swell
defective canned meat can. Can is distended due to production of hydrogen as a result of corrosion of the can surface.
References in periodicals archive ?
The variation tendency of the hydrogen bonding interactions is consistent with that of the fibers' tensile strength, indicating that the increase of intermolecular hydrogen bonding interactions also makes a main contribution to improvement of the mechanical properties.
An analysis of the hydrogen bonding system within water helps to explain how the oceans of the Earth could produce a thermal spectrum with an apparent temperature much lower than their physical temperature [15, 16].
1]), indicating that the urethane groups in HDI are more able to associate by hydrogen bonding and result in highly phase-separated polyurethanes [24].
Reimann (1962-present) Structural and spectroscopic properties of transition metal complexes involving a variety of co-ordinate and hydrogen bonding arrangements creating unique environments.
Recently, reversible polymer networks using low molecular-weight polymers functionalized with three imidazolidone groups and amine to form double hydrogen bonding dimers were illustrated by Toumilhac et al.
5 A from the sulfur of glutathione, well within hydrogen bonding distance.
The high orientation allows extensive hydrogen bonding between the carbonyl and `N-H' functionalities in the amide groups of adjacent polymer chains.
This book gives an extensive description of the state-of-the-art in research on excited-state hydrogen bonding and hydrogen transfer in recent years.
To investigate, if there is any variation in the hydrogen bonding associated with the hystereses observed in the thermo-rheological response, IR measurements were performed during heating and cooling.
The approach not only quantitatively describes hydrogen bonding and polar bonding in many types of systems, but in fact agrees with and extends the very general Prigogine theory.
Migration of the silane is then directed strongly to the silica surface where it accumulates by association through hydrogen bonding.
Taking into account the microstructures of these copolymers, the intermolecular hydrogen bond between the carbonyl group of MMA and the amide group of MAAM has a larger probability of occurring than the self-association through hydrogen bonding of pure PMAAM (15).