Construction and Chemometric Analysis of Acidity Function in Perchloric Acid

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Title:Construction and Chemometric Analysis of Acidity Function in Perchloric Acid
Creators:
Jirásková, Eva
Kulhánek, Jiří
Nevěčná, Taťjana
Pytela, Oldřich
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 64, 8, pp. 1253-1261
Uncontrolled Keywords:Chemometrics, Latent variables, 2,6-Disubstituted anilines, Substituent effects, Acidity functions

Abstract

Four 2,6-disubstituted anilines with CH<sub>3</sub>, Cl, and NO<sub>2</sub> substituents have been synthesized and, together with four commercial substances of the same type, subjected to spectrophotometry to find the concentration ratios of the protonated and non-protonated forms in aqueous perchloric acid of 0.02-10.55 mol dm<sup>-3</sup> concentration. By a procedure devised earlier, the acidity function has been constructed and the p<i>K</i><sub>a</sub> values calculated. The Principal Component Analysis was applied to the acidity function obtained and on other eight acidity functions of perchloric acid were taken from literature. It was found that the first principal component explained 99.78% of variability, which indicated high degree of similarity of the said functions irrespective of the indicator type and solvent used. The regression dependences acidity function values on the first principle component are very close, the regression coefficient expressing the measure of sensitivity of the indicator to the acidifying medium. The p<i>K</i><sub>a</sub> values obtained agree well with the literature data.

Title:Construction and Chemometric Analysis of Acidity Function in Perchloric Acid
Creators:
Jirásková, Eva
Kulhánek, Jiří
Nevěčná, Taťjana
Pytela, Oldřich
Uncontrolled Keywords:Chemometrics, Latent variables, 2,6-Disubstituted anilines, Substituent effects, Acidity functions
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:64
Number:8
Page Range:pp. 1253-1261
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19991253UNSPECIFIED
ID Code:1552
Item Type:Article
Deposited On:06 Feb 2009 17:10
Last Modified:06 Feb 2009 16:10

Citation

Jirásková, Eva; Kulhánek, Jiří; Nevěčná, Taťjana; Pytela, Oldřich (1999) Construction and Chemometric Analysis of Acidity Function in Perchloric Acid. Collection of Czechoslovak Chemical Communications, 64 (8). pp. 1253-1261. ISSN 0010-0765

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