scholarly journals Dynamics of structural diffusion in phosphoric acid hydrogen-bond clusters

RSC Advances ◽  
2017 ◽  
Vol 7 (35) ◽  
pp. 21492-21506 ◽  
Author(s):  
Parichart Suwannakham ◽  
Kritsana Sagarik
Keyword(s):  
Hydrogen Bond ◽  
Phosphoric Acid ◽  
Chain Length ◽  
Bond Chain ◽  
Dielectric Environment

For protonated H3PO4 clusters, the Eigen–Zundel–Eigen mechanism is enhanced by fluctuations in the H-bond chain length and local-dielectric environment, and can proceed without the reorientation of H3PO4 molecules as in the case of neat liquid H3PO4.

Proton dissociation and transfer in a phosphoric acid doped imidazole system

RSC Advances ◽  
2014 ◽  
Vol 4 (106) ◽  
pp. 61992-62008 ◽  
Author(s):  
Jittima Thisuwan ◽  
Kritsana Sagarik
Keyword(s):  
Phosphoric Acid ◽  
Proton Transfer ◽  
Proton Dissociation ◽  
System P ◽  
Bond Chain ◽  
Chain Lengths ◽  
Imidazole System ◽  
Dielectric Environment

Fluctuations of local-dielectric environment and H-bond chain lengths lead to intermediate complexes and proton transfer along the Im H-bond chains.

scholarly journals Mechanism and origins of selectivity in the enantioselective oxa-Pictet–Spengler reaction: a cooperative catalytic complex from a hydrogen bond donor and chiral phosphoric acid

2020 ◽  
Vol 11 (33) ◽  
pp. 8736-8743
Author(s):  
Mark A. Maskeri ◽  
Alexander C. Brueckner ◽  
Taisiia Feoktistova ◽  
Matthew J. O'Connor ◽  
Daniel M. Walden ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Quantum Mechanics ◽  
Phosphoric Acid ◽  
Catalytic Complex ◽  
Hydrogen Bond Donor ◽  
New Model ◽  
Chiral Phosphoric Acid ◽  
Computational Quantum

A new model for the cooperative catalytic oxa-Pictet–Spengler reaction is disclosed. Supporting spectroscopic, kinetic, and computational quantum mechanics studies permit the rationalization of the reaction's observed enantioselectivity.

scholarly journals Polarisable Hydrogen Bond Formation and Ionic Interactions in Model Phospholipid Polar Head Molecules

1973 ◽  
Vol 28 (5-6) ◽  
pp. 323-330 ◽  
Author(s):  
Georg Papakostidis ◽  
Georg Zundel
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Phosphoric Acid ◽  
Bond Formation ◽  
Ion Pairs ◽  
Water Soluble ◽  
Ionic Interactions ◽  
Hydrogen Bond Formation ◽  
Continuous Absorption ◽  
Phosphate Groups

The serine phosphoric acid P-methylester (SPM) and the ethanol-amine phosphoric acid P-methylester (EPM) were synthesized as water soluble models for the functional groups of the corresponding phospholipids. Investigations were made of the aqueous solutions of these molecules as a function of deprotonation and protonation. An intramolecular, easily polarisable hydrogen bond occurs in the zwitterion of the SPM. The solutions of different salts of SPM were studied as well as the influence of counter ion pairs. Counterion pairs hardly influence these bonds. At about 50% deprotonation extremely easily polarisable intermolecular bonds form. At about 100% deprotonation of the zwitterion the hydrogen bonds observed are affected by the presence of CO2. The above is indicated by changes of the bands of the carboxylic and phosphate groups, and in particular by a continuous absorption in the infrared spectrum. During protonation of the EPM easily polarisable intermolecular POH+ ... OP hydrogen bonds form at first, but as protonation increases the solutions become acidic, that is, H5O2+ groupings form.

1D Hydrogen Bond Chain on Pt(211) Stepped Surface Observed by O K-NEXAFS Spectroscopy

2012 ◽  
Vol 116 (26) ◽  
pp. 13980-13984 ◽  
Author(s):  
Osamu Endo ◽  
Masashi Nakamura ◽  
Ryouhei Sumii ◽  
Kenta Amemiya
Keyword(s):  
Hydrogen Bond ◽  
Nexafs Spectroscopy ◽  
Stepped Surface ◽  
Bond Chain

Single-crystal neutron diffraction of urea-phosphoric acid: evidence for H-atom migration in a short hydrogen bond between 150 K and 350 K

2001 ◽  
Vol 216 (6) ◽  
Author(s):  
C. C. Wilson ◽  
K. Shankland ◽  
N. Shankland
Keyword(s):  
Hydrogen Bond ◽  
Neutron Diffraction ◽  
Phosphoric Acid ◽  
Single Crystal ◽  
Diffraction Data ◽  
Neutron Diffraction Data ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Short Hydrogen Bond ◽  
Atom Migration

AbstractThe structure of urea-phosphoric acid has been refined using single-crystal neutron diffraction data collected at seven temperatures in the range 150 K to 350 K. The structure is orthorhombic, space group

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