Kinetic studies of proton-exchange reactions between imidazole groups of small molecules and hydrogen phosphate ions in aqueous solution using ultrasonic relaxation

1991 ◽  
Vol 95 (10) ◽  
pp. 4015-4019 ◽  
Author(s):  
D. Rogez ◽  
R. Andrianjara ◽  
C. H. Choi
Keyword(s):  
Aqueous Solution ◽  
Small Molecules ◽  
Kinetic Studies ◽  
Proton Exchange ◽  
Exchange Reactions ◽  
Hydrogen Phosphate ◽  
Phosphate Ions ◽  
Ultrasonic Relaxation

scholarly journals Bloch equations for proton exchange reactions in an aqueous solution

2016 ◽  
Vol 45A (3) ◽  
pp. e21397 ◽  
Author(s):  
Jae-Seung Lee ◽  
Ravinder R. Regatte ◽  
Alexej Jerschow
Keyword(s):  
Aqueous Solution ◽  
Proton Exchange ◽  
Exchange Reactions ◽  
Bloch Equations

New low-spin Co(II) complexes with novel tripodal 1,1,1-tris(dimethylphosphinomethyl)ethane ligand: electron transfer kinetics and spectroscopic characterization of Co(II)P6 and Co(II)P3S3 ions in aqueous solution

2001 ◽  
Vol 79 (9) ◽  
pp. 1344-1351 ◽  
Author(s):  
Satoshi Iwatsuki ◽  
Kenji Obeyama ◽  
Nobuyoshi Koshino ◽  
Shigenobu Funahashi ◽  
Kazuo Kashiwabara ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Spin State ◽  
Kinetic Studies ◽  
Spectroscopic Characterization ◽  
Electronic Configuration ◽  
Exchange Reactions ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Controlled Potential

Substitution-inert Co(II) complexes with tripodal 1,1,1-tris(dimethylphosphinomethyl)ethane were produced in aqueous solution by the controlled-potential electrolysis. EPR studies indicated that the Co(II)P6 and Co(II)P3S3 species are in the low-spin t62ge1g state. The analyses of the absorption spectra of the Co(II) species in solution indicated significant Jahn–Teller distortion in Co(II)P6 and Co(II)P3S3 ions as expected for the low-spin d7 electronic configuration, while less distortion was observed for the Co(II)S6 ion. Kinetic studies of the redox reactions involving these Co(III/II) species confirmed that the electron self-exchange reactions for the Co(III/II)P6 and Co(III/II)P3S3 couples are relatively fast (kex ~ 1 × 104 dm3 mol–1 s–1), which is consistent with the results for other low-spin – low-spin Co(III/II) couples. It was concluded that the nephelauxetic effect of the P-donor atom stabilizes the low-spin state in Co(II), and that the rather rapid electron exchange rates for these Co(III/II) couples were explained by the lack of the spin reorganization process required for the ordinary low-spin – high-spin Co(III/II) couples.Key words: cobalt(III/II), spin state, EPR study, kinetics, electron transfer.

scholarly journals Adsorption of Phosphate Ions from Aqueous Solution of Nickel Hydroxides Calcined at Different Temperatures

2014 ◽  
Vol 12 (0) ◽  
pp. 404-409 ◽  
Author(s):  
Fumihiko Ogata ◽  
Daisuke Imai ◽  
Megumu Toda ◽  
Masashi Otani ◽  
Naohito Kawasaki
Keyword(s):  
Aqueous Solution ◽  
Phosphate Ions ◽  
Different Temperatures

Micellar catalysis of organic reactions. VIII. Kinetic studies of the hydrolysis of 2-acetyloxybenzoic acid (aspirin) in the presence of micelles

1982 ◽  
Vol 35 (7) ◽  
pp. 1357 ◽  
Author(s):  
TJ Broxton
Keyword(s):  
Aqueous Solution ◽  
Cetyltrimethylammonium Bromide ◽  
Cetylpyridinium Chloride ◽  
Kinetic Studies ◽  
Base Catalysis ◽  
Plateau Region ◽  
General Base ◽  
Mechanism Of Hydrolysis ◽  
Ph Range ◽  
Hydrolysis Of

The hydrolysis of 2-acetyloxybenzoic acid in the pH range 6-12 has been studied in the presence of micelles of cetyltrimethylammonium bromide (ctab) and cetylpyridinium chloride (cpc). In the plateau region (pH 6-8) the hydrolysis is inhibited by the presence of micelles, while in the region where the normal BAC2 hydrolysis (pH > 9) occurs the reaction is catalysed by micelles of ctab and cpc. The mechanism of hydrolysis in the plateau region is shown to involve general base catalysis by the adjacent ionized carboxy group both in the presence and absence of micelles. This reaction is inhibited in the presence of micelles because the substrate molecules are solubilized into the micelle and water is less available in this environment than in normal aqueous solution.

Sign in / Sign up

Export Citation Format

Share Document