hydrogen bond

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hydrogen bond

[′hī·drə·jən ′bänd]
(physical chemistry)
A type of bond formed when a hydrogen atom bonded to atom A in one molecule makes an additional bond to atom B either in the same or another molecule; the strongest hydrogen bonds are formed when A and B are highly electronegative atoms, such as fluorine, oxygen, or nitrogen.
References in periodicals archive ?
As two complementary strands get longer, the additive nature of the H-bond energies comes into play, and at some total number of potential H-bonds between two single DNA strands, their energy surpasses the temperature dependent vibrational energies, and the two strands stick together.
The temperature at which thermal energy exactly matches H-bond energy for a given DNA paired sequence, and the strands hover between annealing and denaturation, is known as the melting temperature or Tm of the sequence.
Now, two equilibriums for the dissociation of the two kinds of H-bond are considered.
The enthalpies of the two kinds of H-bond dissociation are denoted as [[DELTA]H.
The chemoselectivity of the esterification reaction was attributed to the H-bond withdrawing electrons from the carbonyl, thereby promoting the nucleophilic attack by an OH group.
Zagar, E, Grdadolnik, J, "An Infrared Spectroscopic Study of H-Bond Network in Hyperbranched Polyester Polyol.
We calculated ligand interatomic distances and H-bond energies using the SPARTAN molecular modeling software (version 5.
The most obvious explanation is the lack of hydrogen bond acceptor capability at this site in 7 and 8 and the weaker and more conformationally constrained H-bond acceptor capability of chlorine in derivative 9.
Characterization of H-bond in P(AN-MA)IAT Nanocomposites Through FTIR Analysis
Polyurethane-based azopolymers, containing no hydroxyl groups in the main chains and only less accessible NH groups as H-bond donors, were anticipated to have more labile azo groups and hence to exhibit higher SRG efficiency than the epoxy- or aniline-based azopolymers.
TSA] membrane did not show this behavior, suggesting the occurrence of H-bonds between polyaniline amines and PU.