Topic
Hydrogen bond
About: Hydrogen bond is a research topic. Over the lifetime, 57701 publications have been published within this topic receiving 1306326 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: A simple one-pot strategy to prepare a fully physically cross-linked nanocomposite hydrogel through the formation of the hydrogen bonds and dual metal-carboxylate coordination bonds within supramolecular networks, in which iron ions and TEMPO oxidized cellulose nanofibrils (CNFs) acted as cross-linkers and led to the improved mechanical strength, toughness, time-dependent self-recovery capability and self-healing property.
Abstract: Dynamic noncovalent interactions with reversible nature are critical for the integral synthesis of self-healing biological materials. In this work, we developed a simple one-pot strategy to prepare a fully physically cross-linked nanocomposite hydrogel through the formation of the hydrogen bonds and dual metal-carboxylate coordination bonds within supramolecular networks, in which iron ions (Fe3+) and TEMPO oxidized cellulose nanofibrils (CNFs) acted as cross-linkers and led to the improved mechanical strength, toughness, time-dependent self-recovery capability and self-healing property. The spectroscopic analysis and rheological measurements corroborated the existence of hydrogen bonds and dual coordination bonds. The mechanical tests and microscopic morphology were explored to elucidate the recovery properties and toughening mechanisms. The hydrogen bonds tend to preferentially break prior to the coordination bonds associated complexes that act as skeleton to maintain primary structure integrity, and th...
279 citations
TL;DR: In this paper, the properties of C-H-O hydrogen bonds in carbohydrate crystal structures were analyzed on the basis of 30 neutron diffraction studies (395 H atoms bonded to C as potential donors, and 328 O atoms at potential acceptors).
Abstract: Geometrical properties of C-H---O hydrogen bonds in carbohydrate crystal structures are analyzed on the basis of 30 neutron diffraction studies (395 H atoms bonded to C as potential donors, and 328 O atoms at potential acceptors). A total of 21% of the H atoms are engaged in C-H---O interactions with H---O separations of <2.5 A (and 65% of the H's with H---O<2.7 A). Only 7% of the H atoms have no contact to 0 shorter than 3.0 A. Correlations between hydrogen-bond distances and angles are studied in scatterplots
279 citations
TL;DR: The concept that the collagen molecule is thermally stabilized by loss of configurational entropy of the molecule in the fiber lattice, is refined by examining the process theoretically by combining an equation for the entropy of a polymer-in-a-box with the previously published rate theory analysis of collagen denaturation.
279 citations
279 citations
TL;DR: In this article, the authors studied the factors giving rise to proton resonance chemical shifts of free molecules, as well as the association shifts due to hydrogen bonding, and found that the proton signals measured in the liquid state near the melting point, which correspond to maximum association, show large shifts to lower magnetic field relative to the corresponding gas signals.
Abstract: In order to study the factors giving rise to proton resonance chemical shifts of free molecules, as well as the association shifts due to hydrogen bonding, proton resonance measurements were carried out for a variety of simple hydride molecules in both the liquid and gaseous states. It is found that the proton shifts in the gaseous state can be interpreted in terms of the combined effect of the electronegativity and magnetic anisotropy of the atom to which the proton is bonded. The proton signals measured in the liquid state near the melting point, which correspond to maximum association, show large shifts to lower magnetic field relative to the corresponding gas signals. It is suggested that the association, or hydrogen bond shifts, in a system Y ——— H — X can be interpreted largely in terms of the reduction of the diamagnetic circulation in the H — X bond by the electrostatic field of the Y donor. Further possible contributions in certain anomalous cases are also considered.
278 citations