Flip-flop hydrogen bonding in a partially disordered system

Betzel, C.; Hingerty, Brian E.; Brown, G.

doi:10.1038/296581a0

Cited by 109 publications

(51 citation statements)

References 7 publications

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“…It seems likely that this disorder is via a 'flip-flop' conformational mechanism involving reorientation of the hydroxyl groups, rather than the configurational bond-breaking mechanism of an enol-keto transformation (Saenger, 1982).…”

Section: Hydrogen Bonding In Carbohydrate Crystal Structuresmentioning

confidence: 99%

Crystallographic studies of carbohydrates

Jeffrey¹

1990

Acta Crystallogr B Struct Sci

150

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The monosaccharides which constitute the monomer units of many important industrial and biological macromolecules are well represented among the 2000 crystal structures of the carbohydrate class 45 of the Cambridge Structural Database. There are few examples of crystal structure analyses of the corresponding acids, but many of their calcium salts and calcium salt complexes. With the exception of the disaccharides and cyclodextrins, the oligosaccharides are not well represented, with less than ten trisaccharides, one tetrasaccharide and one hexasaccharide-iodide complex. Two important conformational factors are the Hassel-Ottar effect and the anomeric effect, both of which have been studied using crystallographic data. Hydrogen bonding is ubiquitous in carbohydrate crystals and generally involves all the hydroxyls as both donors and acceptors, and some of the ring and glycosidic oxygens as acceptors. These hydrogen bonds tend to form finite or infinite chains. In hydrates, these chains are linked through the water molecules to form networks. Cyclic hydrogen-bond systems are observed in the cyclodextrins. Long-chain alkylated carbohydrates provide a large class of thermotropic and lyotropic liquid crystals, and some non-ionic surfactants which have been shown to be useful for membrane-protein solubilization and crystallization.

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Section: Hydrogen Bonding In Carbohydrate Crystal Structuresmentioning

confidence: 99%

Crystallographic studies of carbohydrates

Jeffrey¹

1990

Acta Crystallogr B Struct Sci

150

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“…A cooperative proton transfer mechanism (flip-flop hydrogen bonding, domino mechanism) [148] was found in continuous water clusters adsorbed on proteins by neutron diffraction analysis. This phenomenon is likely to be similar to the cooperative polarization mechanism found earlier in silica gel [149].…”

Section: Dependence Of Charge Transport Processes On the Amount Of Admentioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

102

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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“…Water is a structured liquid (108). In the absence of phenol, in the close vicinity of ssDNA, the water molecule network follows the geometry of the polyelectrolyte (109,110). The ability of phenol to form hydrogen bonds and its aromatic character allow this molecule to interact with water and to disturb locally the hydrogen network formed among water molecules.…”

Section: Discrete Approach Without Saltmentioning

confidence: 99%

DNA renaturation at the water-phenol interface

Goldar

Sikorav

2004

Eur. Phys. J. E

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We study DNA adsorption and renaturation in a water-phenol two-phase system, with or without shaking. In very dilute solutions, single-stranded DNA is adsorbed at the interface in a salt-dependent manner. At high salt concentrations the adsorption is irreversible. The adsorption of the single-stranded DNA is specific to phenol and relies on stacking and hydrogen bonding. We establish the interfacial nature of a DNA renaturation at a high salt concentration. In the absence of shaking, this reaction involves an efficient surface diffusion of the single-stranded DNA chains. In the presence of a vigorous shaking, the bimolecular rate of the reaction exceeds the Smoluchowski limit for a three-dimensional diffusion-

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Flip-flop hydrogen bonding in a partially disordered system

Cited by 109 publications

References 7 publications

Crystallographic studies of carbohydrates

Crystallographic studies of carbohydrates

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

DNA renaturation at the water-phenol interface

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