Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: carboxybetaines

Sortuj według:

Ogranicz wyniki do:

Aqueous basicity and proton affinity of flexible carboxybetaines, N+(CH2)nCOO-

Barczyński P., Dega-Szafran Z., Szafran M.

Polish Journal of Chemistry

1998

Vol. 72, nr 2

277-283

pKa Values of 22 carboxybetaines in water were determined by potentiometric titration of their hydrohalides with KOH and their proton affinities (PA) in the gas phase were calculated using the AM1 method. The linear dependence of the pKa with 1/n implies that the distance between the two charged centers increases monotonically with the number of the methylene group (n). The calculated Pa value for betaine is close to the experimental value. The acceptable results obtained for the correlation between pKa and PA, gives confidence to predict PA for the unknown betaines.