Dissociation Constants of alpha-D-Isosaccharinic Acid: "Composite" and "Intrinsic" Values
Artikel i vetenskaplig tidskrift, 2010

The transformation of alpha-D-isosaccharinic acid into alpha-D-isosaccharino-1,4-lactone proceeds relatively slowly. Consequently, the transformation constant, K-L, has been determined kinetically in 1.0 mol center dot dm(-3) NaClO4 and at 23 degrees C. A previous determination in 0.1 mol center dot dm(-3) NaClO4 and at 23 degrees C has been reinterpreted. The values obtained have been coupled with other data in the literature to demonstrate that the magnitude of the transformation constant is independent of ionic strength, and its value was determined to be log K-L degrees = 0.80 +/- 0.02. Data from the literature for the dissociation of alpha-D-isosaccharinic acid have been re-evaluated to determine both the "intrinsic" and "composite" dissociation constants at zero ionic strength, namely, log K-u degrees = -4.04 +/- 0.06 and log K-c degrees = -4.90 +/- 0.07, respectively. The present data permit a much more thorough understanding of the aqueous chemistry of alpha-D-isosaccharinic acid to be ascertained than has previously been possible.

isosaccharinate

cellulose degradation-products

capillary-electrophoresis

complexation

protonation

alkaline conditions

solubility

np(iv)

calcium

Författare

P. L. Brown

Geochem Australia

Stefan Allard

Chalmers, Kemi- och bioteknik, Kärnkemi

Christian Ekberg

Chalmers, Kemi- och bioteknik, Kärnkemi

Journal of Chemical & Engineering Data

0021-9568 (ISSN) 1520-5134 (eISSN)

Vol. 55 5207-5213

Ämneskategorier

Kemi

DOI

10.1021/je100740f