Ions increase strength of hydrogen bond in water

Abstract

Knowledge of water-water potential is important for an accurate description of water. Potential between two molecules depends upon the distance, relative orientation of each molecule and local environment. In simulation, water-water hydrogen bonds are handled by point-charge water potentials and by polarizable models. These models produce good results for bulk water being parameterized for such environment. Water around surfaces and in channels, however is different from bulk water. Using quantum-mechanical methods, hydrogen bond strength was calculated in the vicinity of different monoions. A simple empirical relationship was discovered between the maximum hydrogen bond and the electric field produced by ion.

Hydrogen bonding between hydrides of the upper-right part of the periodic table

“…The hydrogen bond interaction energy in the water dimer is –4.68 kcal mol −1 , being in agreement with the commonly quoted empirical value which is –5.4 ± 0.7 kcal mol −1 [57, 58]. Our calculations are also in good agreement with the calculations performed by other authors [59–62].…”

The physico-chemistry of adhesions of protein resistant and weak polyelectrolyte brushes to cells and tissues

“…Hence, cations are known to alter the melting temperature of doublestranded oligonucleotides, although this is via their combined impact on coulombic repulsion between phosphates and on hydrogen bonding between bases. 83 Electrolytes were shown to reinforce hydrogen bonding 84 and to perturb networks of intramolecular hydrogen bonds of water molecules. 85 In addition, electrolytes such as phosphates are particularly prone to hydrogen bond and alter interactions with biomacromolecules.…”

Intact nucleosomal context enables chromodomain reader MRG15 to distinguish H3K36me3 from -me2

“…In general, cations are known to abrogate interactions between DNA and octamer as they ion pair to the anionic DNA backbone; Na + is known to do this more effectively than K +30 . Moreover, ion type and ionic strength can modulate cooperativity and strength of hydrogen bonds 31 . Therefore, it stands to reason that discrimination by MRG15 may critically involve different modes of DNA-to-octamer interactions modulated by methylation states.…”