Proton Exchange Reaction between Hydroxyl Groups in the Supercage and Those in the Sodalitecage of Y Zeolite As Studied by Variable Temperature1H MAS NMR

2012 ◽  
Vol 116 (33) ◽  
pp. 17734-17738 ◽  
Author(s):  
Naoki Asakawa ◽  
Ken Motokura ◽  
Tatsuaki Yashima ◽  
To-ru Koyama ◽  
Toshinori O-nuki ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Proton Exchange ◽  
Mas Nmr ◽  
Hydroxyl Groups ◽  
Y Zeolite

scholarly journals The Synthesis of Poly(Vinyl Alcohol) Grafted with Fluorinated Protic Ionic Liquids Containing Sulfo Functional Groups

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4158
Author(s):  
Patrycja Glińska ◽  
Andrzej Wolan ◽  
Wojciech Kujawski ◽  
Edyta Rynkowska ◽  
Joanna Kujawa
Keyword(s):  
Ionic Liquids ◽  
Vinyl Alcohol ◽  
Proton Exchange ◽  
Polymer Materials ◽  
Polymerization Reaction ◽  
Poly Vinyl Alcohol ◽  
Hydroxyl Groups ◽  
Protic Ionic Liquids ◽  
Synthesis Route ◽  
Sulfo Groups

There has been an ongoing need to develop polymer materials with increased performance as proton exchange membranes (PEMs) for middle- and high-temperature fuel cells. Poly(vinyl alcohol) (PVA) is a highly hydrophilic and chemically stable polymer bearing hydroxyl groups, which can be further altered. Protic ionic liquids (proticILs) have been found to be an effective modifying polymer agent used as a proton carrier providing PEMs’ desirable proton conductivity at high temperatures and under anhydrous conditions. In this study, the novel synthesis route of PVA grafted with fluorinated protic ionic liquids bearing sulfo groups (–SO3H) was elaborated. The polymer functionalization with fluorinated proticILs was achieved by the following approaches: (i) the PVA acylation and subsequent reaction with fluorinated sultones and (ii) free-radical polymerization reaction of vinyl acetate derivatives modified with 1-methylimidazole and sultones. These modifications resulted in the PVA being chemically modified with ionic liquids of protic character. The successfully grafted PVA has been characterized using 1H, 19F, and 13C-NMR and FTIR-ATR. The presented synthesis route is a novel approach to PVA functionalization with imidazole-based fluorinated ionic liquids with sulfo groups.

scholarly journals Competition between excited state proton and OH− transport via a short water wire: solvent effects open the gate

2014 ◽  
Vol 16 (26) ◽  
pp. 13047-13051 ◽  
Author(s):  
Gül Bekçioğlu ◽  
Christoph Allolio ◽  
Maria Ekimova ◽  
Erik T. J. Nibbering ◽  
Daniel Sebastiani
Keyword(s):  
Excited State ◽  
Exchange Reaction ◽  
Quantum Chemical Calculations ◽  
Solvent Effects ◽  
Quantum Chemical ◽  
Proton Exchange ◽  
Acid Base

We investigate the acid–base proton exchange reaction in a microsolvated bifunctional chromophore by means of quantum chemical calculations.

scholarly journals The Exchange Reaction of Deuterium with the Hydroxyl Groups of Zeolite Catalysts

1972 ◽  
Vol 45 (2) ◽  
pp. 366-370 ◽  
Author(s):  
Toshinobu Imanaka ◽  
Yasuaki Okamoto ◽  
Kazunori Takahata ◽  
Shiichiro Teranishi
Keyword(s):  
Exchange Reaction ◽  
Zeolite Catalysts ◽  
Hydroxyl Groups

FRUCTOSE DIPHOSPHATE ALDOLASE FROM FUSARIUM OXYSPORUM f. LYGOPERSICI: II. CHARACTERISTICS OF THE EXCHANGE REACTION

1967 ◽  
Vol 45 (10) ◽  
pp. 1505-1511 ◽  
Author(s):  
J. M. Ingram
Keyword(s):  
Methylene Blue ◽  
Fusarium Oxysporum ◽  
Exchange Reaction ◽  
Active Site ◽  
Reaction Rates ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Dihydroxyacetone Phosphate ◽  
Cleavage Reaction ◽  
Twofold Decrease

Fruetose-1,6-diphosphate aldolase purified from extracts of Fusarium oxysporum f. lycopersici was examined in detail. The different pH optima obtained for the proton exchange (pH 6.0) and cleavage (pH 7.5) reactions indicate that this enzyme resembles the yeast FDP-aldolase rather than the aldolase from muscle. When the enzyme was dialyzed extensively, in the absence of Cleland's reagent, it was found that neither the cleavage nor the exchange reaction rates were increased appreciably after addition of mercaptan. Treatment of the enzyme with either methylene blue in the presence of light or with diazosulfanilic acid, two known inhibitors of the cleavage reaction, resulted in almost complete inhibition of FDP cleavage but only a twofold decrease in the exchange capacity. These results substantiate our previous findings that the inhibitors react with residues involved in the D-glyceraldehyde-3-phosphate rather than the dihydroxyacetone phosphate active site.

13C-NMR quantification of proton exchange at LewisX hydroxyl groups in water

2011 ◽  
Vol 47 (38) ◽  
pp. 10800 ◽  
Author(s):  
Shinya Hanashima ◽  
Koichi Kato ◽  
Yoshiki Yamaguchi
Keyword(s):  
13C Nmr ◽  
Proton Exchange ◽  
Hydroxyl Groups

Proton-exchange rates in solid tropolone as measured via carbon-13 CP/MAS NMR

1983 ◽  
Vol 105 (9) ◽  
pp. 2579-2582 ◽  
Author(s):  
Nikolaus M. Szeverenyi ◽  
Ad Bax ◽  
Gary E. Maciel
Keyword(s):  
Exchange Rates ◽  
Proton Exchange ◽  
Mas Nmr ◽  
Cp Mas Nmr

The proton exchange reaction between indene and the indenyl anion

1974 ◽  
Vol 6 (11) ◽  
pp. 574-576 ◽  
Author(s):  
H. W. Vos ◽  
Y. W. Bakker ◽  
N. H. Velthorst ◽  
C. Maclean
Keyword(s):  
Exchange Reaction ◽  
Proton Exchange

Hydroxyl groups on hydrogen Y zeolite

1969 ◽  
Vol 73 (6) ◽  
pp. 2086-2088 ◽  
Author(s):  
John William Ward
Keyword(s):  
Hydroxyl Groups ◽  
Y Zeolite
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