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...
8.5.1.3Hydrogen Bonds Hydrogen bondsare intermediate in terms of strength and length when compared to van der waal's forces and covalent bonds. A hydrogen bond is mainly formed between a donor atoms such as an amine, which acts as a ligand, or a lewis base and acceptor atom like carboxylic...
A hydrogen bond is mainly formed between a donor atoms such as an amine, which acts as a ligand, or a lewis base and acceptor atom like carboxylic acid. The larger the number of amino acids in a given protein molecule, the greater is the probability of the formation of hydrogen bonds. ...
The bifluoride ion (for which no proper Lewis structure can be written) can be regarded as a complex ion held together by the strongest hydrogen bond known: about 155 kJ mol–1. "As slow as molasses in the winter!" Multiple hydroxyl groups provide lots of opportunities for hydrogen bonding...
BasedontheLewisstructurefor hydrogen peroxide, H2O2,how many polar bonds and nonpolar bonds are present A. 3polarand0nonpolarbonds B. 2polarand2nonpolarbonds C. 1polarand2nonpolarbonds D. 0polarand3nonpolarbonds E. 2polarandlnonpolarbond ...
Previous studies showed that the latter species in solution exists as an equilibrium mixture of the monomer (1m) and a cyclic trimer (1t), in variable ratios, and that the trimer is stabilized in the presence of Lewis bases, by the formation of strong 1t···L hydrogen bonds. In the ...
It is well known that various transition elements can form M···H hydrogen bonds. However, for gold, there has been limited decisive experimental evidence of such attractive interactions. Herein we demonstrate an example of spectroscopically identified
the zinc–oxime bonds may be partially cleaved, leaving oxime ligands poised to scavenge copper ions. On the other hand, the unbound Lewis basic pyrrolic nitrogen atoms of the imidazole side chains in ZIOS should have a high affinity for Lewis acidic Cu2+ions. These sites could actively coord...
Various intriguing structures and complicated entanglements have been constructed based on hydrogen bonds, such as nanocapsules, nanotubes, and n-Borromean arrayed topologies. The crystal engineering strategy has lent chemists the ability to control solid state reactions regio- and stereo-specifically and ...
The secondary structure assignment is based on Define Secondary Structure of Proteins (DSSP) model [44]. a) Native and transient states; b) Helicity-enhancing mutants; c) Helicity-disrupting mutants. 3.2.2. Changes in the patterns of the hydrogen bonds. The reason behind the changes in the ...