Spectrophotometric studies on 4-acyl derivatives of 1-phenyl-3-methylpyrazolone-5 in various solvents

The ultraviolet absorption spectra of various 4-acyl substituents of 1-phenyl-3-methylpyrazolone-5 in 20% aqueous dioxane and various organic solvents are studied. The 4-acyl substituents which can be grouped as alkyl-, halo- and aromatic-substituted, have pH-absorption spectral characteristics pecu...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 1995-06, Vol.51 (6), p.1081-1082
Main Author: Uzoukwu, Bieluonwu Augustus
Format: Article
Language:English
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Summary:The ultraviolet absorption spectra of various 4-acyl substituents of 1-phenyl-3-methylpyrazolone-5 in 20% aqueous dioxane and various organic solvents are studied. The 4-acyl substituents which can be grouped as alkyl-, halo- and aromatic-substituted, have pH-absorption spectral characteristics peculiar to each of the groups. Two intraligand π → π ∗ transitions are observed in all the solvents while a third band due to intraligand charge transfer is observed as the Z-value of the solvent increases. A plot of pH against α-values is obtained and discussed. The K a1 and K a2 values for the ligands are determined.
ISSN:0584-8539
1386-1425
DOI:10.1016/0584-8539(94)01297-T