Thereby the higher order amines become relatively weaker bases in aqueous solution due to the limitations in hydrating their polar sites.doi:10.1016/0166-1280(89)87081-2P. NagyJournal of Molecular Structure THEOCHEMNagy P. Theoretical calculations on the basicity of amines. journal of molecular ...
We have used microcalorimetry to measure the differential heats of adsorption for a series of simple amines in H-ZSM-5 as a function of coverage. For each molecule studied, the heats of adsorption were approximately constant to a coverag... DJ Parrillo,RJ Gorte,WE Farneth - 《Journal of ...
The adsorption order at 25°C was: BA (0.9) > MA (0.72) > AN (0.63) > DPA (0.48) > GA (0.30 mmol/g), and the order at 80°C was BA > AN > GA ~ MA ~ DPA. Both the orders reflected the importance of basicity over hydrophobicity of amines in the adsorption onto charcoal. ...
The adsorption order at 25 degrees C was: BA (0.9)>MA (0.72)>AN (0.63)>DPA (0.48)>GA (0.30mmol/g), and the order at 80 degrees C was BA>AN>GA similar to MA similar to DPA. Both the orders reflected the importance of basicity over hydrophobicity of amines in the adsorption onto...
The proton-transfer efficiency exhibits the order NH3>(CH3)NH2=(CH3)2NH, which opposes the basicity order of the amines in the gas phase or aqueous solution. Thermochemical analysis suggests that the energetics of the proton-transfer reaction is greatly altered at the ice surface from that in ...
The heats of neutralization of the amines B and their heats of solution have been obtained by calorimetry. The pK's and enthalpies of ionization of these BH+ ions and alkylammonium ions are linearly related. Comparisons with gas phase data show that the abnormal basicity order of the amines ...
The heats of neutralization of the amines B and their heats of solution have been obtained by calorimetry. The pK's and enthalpies of ionization of these BH+ ions and alkylammonium ions are linearly related. Comparisons with gas phase data show that the abnormal basicity order of the amines ...
In order to investigate the Lewis acid/base chemistry of silylamines in solution, the equilibrium reactions of Me3SiNMe2 / Me3SiNMe2(BH3) and different amines NR3 / amineboranes NR3(BH3) were monitored by 1H NMR spectroscopy in C6D6 and CDCI3 at 60 掳C. For the equilibrium of the ...
In order to obtain an estimate of it, the infrared spectra in chloroform d solution of a number of aliphatic amines, pyridine derivatives and non-aromatic Schiff- bases have been measured. From the known p K a values of the aliphatic and pyridine bases and the free-associated frequency shift...
The adsorption of amines onto charcoal was found to increase with increasing pH, which was interpreted in terms of a model that depends on acid–base reaction between basic amines and acidic functional groups of charcoal.Keywords: Adsorption, Charcoal, Methylamine, Glucosamine, Benzylamine,...