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

• Autorzy: Barczyński P. , Dega-Szafran Z. , Szafran M.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

carboxybetaines; equilibrium; proton affinity

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1998
• Tom: Vol. 72, nr 2
• Strony: 277--283
• Opis fizyczny: Bibliogr. 24 poz., tab.

Twórcy

autor

Barczyński P.

autor

Dega-Szafran Z.

autor

Szafran M.

• Faculty of Chemistry A. Mickiewicz University 60-780 Poznań Poland