Hydrogen bonds are ___ when the bonded molecules are oriented to maximize electrostatic interaction, which occurs when the hydrogen atom and the two atoms that share it are in a straight line—that is, when the acceptor atom is in line with the covalent bond between the donor atom...
MP2/6-31++G( d,p ) ab initio molecular orbital calculations have been employed to characterize hydrogen-bonded complexes between hydrogen fluoride as proton donor and aromatic azines (pyridine, pyrimidine, pyridazine, pyrazine, 1,3,5-triazine, and 1,2,4-triazine). Our calculations have shown ...
Hydrogen bonds are attractions between a δ+ hydrogen on one molecule and a lone pair on a very electronegative atom (N, O or F) on another molecule.Note: You may have also have considered the effect of the change of halogen on the dipole-dipole interactions which will also be present. ...
At room temperature, however, only two hydrogen bonds were formed, compared to 19 bonds when the reaction occurred at body temperature. More bonds equal higher specificity. Hen Egg-white Lysozyme Strong hydrogen bonds are formed between a particular glutamine in the hen egg-white lysozyme (HEWL)...
8.5.1.3Hydrogen Bonds Hydrogen bondsare intermediate in terms of strength and length when compared tovan der waal's forcesandcovalent bonds. A hydrogen bond is mainly formed between a donor atoms such as an amine, which acts as a ligand, or a lewisbaseand acceptor atom likecarboxylic acid. ...
112 have found a quantitative correlation between the NMR chemical shifts and the geometry (distance and angle) of weak CH⋅⋅⋅O hydrogen bonds. Cluster calculations are oftentimes seen necessary for reproducing hydrogen-bond effects on shielding. For example, explicit water molecules in the ...
The meaning of HYDROGEN BOND is an electrostatic attraction between a hydrogen atom in one polar molecule (as of water) and a small electronegative atom (as of oxygen, nitrogen, or fluorine) in usually another molecule of the same or a different polar su
However, X-ray analysis of crystalline diketo-piperazine, a substance related to the proteins, shows that the molecules are linked together by hydrogen bonds between their respective oxygen atoms and =NH groups, to form flat continuous chains throughout the structure. ···0 CH"2 - . /H·...
Initially, when wafers or dies are pressed together, they are held in place with relatively weak hydrogen bonds, and the concern is ensuring that everything stays in place between the bonding and further steps. IEEE Spectrum, 4 June 2024 The hydrogen bonds are more flexible in wet hair and ...
Hydrogen bonds are found in nucleic acids between base pairs and between water molecules. Hydrogen bonds also form between hydrogen and carbon atoms of different chloroform molecules, between hydrogen and nitrogen atoms of neighboring ammonia molecules, between repeating subunits in the polymer nylon, an...