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

被引:31
作者
CASULA, R
CRISPONI, G
CRISTIANI, F
NURCHI, V
CASU, M
LAI, A
机构
[1] DIPARTIMENTO CHIM & TECNOL INORGAN & MET ORGAN,VIA OSPED 72,I-09124 CAGLIARI,ITALY
[2] DIPARTIMENTO SCI CHIM,I-09124 CAGLIARI,ITALY
关键词
D O I
10.1016/0039-9140(93)80097-B
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The pK values of the second ionization of a set of substituted sulfonephthaleins are studied by spectrophotometry and C-13 NMR spectroscopy. A study of the correlation between equilibrium and spectral data on the one hand and the substituent effects on the other is presented, using the dual substituent analysis of Swain and Lupton. This shows a complete dependence of pK values on the F field variable, and of the wavelengths of the bands of basic forms on the R resonance variable.
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页码:1781 / 1788
页数:8
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