A SPECTROPHOTOMETRIC STUDY OF PYRAZINE AND ITS 2-HYDROXY-3-PHENYL DERIVATIVES - CHARACTERIZATION OF ABSORPTION-SPECTRA BY LOGNORMAL CURVES

Authors
PINEDA T SEVILLA JM BLAZQUEZ M NUNEZVERGARA LJ SQUELLA JA DOMINGUEZ M
Citation
T. Pineda et al., A SPECTROPHOTOMETRIC STUDY OF PYRAZINE AND ITS 2-HYDROXY-3-PHENYL DERIVATIVES - CHARACTERIZATION OF ABSORPTION-SPECTRA BY LOGNORMAL CURVES, Gazzetta chimica italiana, 123(11), 1993, pp. 623-627
Citations number
23
Categorie Soggetti
Chemistry
Journal title
Gazzetta chimica italiana → ACNP
ISSN journal
00165603
Volume
123
Issue
11
Year of publication
1993
Pages
623 - 627
Database
ISI
SICI code
0016-5603(1993)123:11<623:ASSOPA>2.0.ZU;2-P
Abstract
Absorption spectra of pyrazine and its derivatives, 2-hydroxy-6-methyl -3-phenylpyrazine (HMPP) and 2-hydroxy-3(p-hydroxyphenyl)-6-methylpyra zine (HHMP) have been studied in a wide pH interval. Sulphuric acid so lutions in strong acid media and buffered solutions for the rest of th e pH interval were employed. The variation of the absorbance and maxim um wavelength with the pH provided an estimate of the acid-base consta nts of these compounds. An application of the lognormal curves for the description of the absorption spectra of pyrazine and its derivatives is described. Also a comparison of the fitting parameters of these de rivatives is presented.