CHARACTERIZATION OF THE IONIZATION AND SPECTRAL PROPERTIES OF SULFONEPHTHALEIN INDICATORS - CORRELATION WITH SUBSTITUENT EFFECTS AND STRUCTURAL FEATURES

Authors
CASULA R CRISPONI G CRISTIANI F NURCHI V CASU M LAI A
Citation
R. Casula et al., CHARACTERIZATION OF THE IONIZATION AND SPECTRAL PROPERTIES OF SULFONEPHTHALEIN INDICATORS - CORRELATION WITH SUBSTITUENT EFFECTS AND STRUCTURAL FEATURES, Talanta, 40(12), 1993, pp. 1781-1788
Citations number
30
Journal title
Talanta
ISSN journal
00399140 → ACNP
Volume
40
Issue
12
Year of publication
1993
Pages
1781 - 1788
Database
ISI
SICI code
0039-9140(1993)40:12<1781:COTIAS>2.0.ZU;2-2
Abstract
The pK values of the second ionization of a set of substituted sulfone phthaleins are studied by spectrophotometry and C-13 NMR spectroscopy. A study of the correlation between equilibrium and spectral data on t he one hand and the substituent effects on the other is presented, usi ng the dual substituent analysis of Swain and Lupton. This shows a com plete dependence of pK values on the F field variable, and of the wave lengths of the bands of basic forms on the R resonance variable.