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Polarographic and spectrophotometric behavior of some N-para-phenyl substituted benzamidines

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1991-12
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Squella Serrano, Juan
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Polarographic and spectrophotometric behavior of some N-para-phenyl substituted benzamidines
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Author
  • Squella Serrano, Juan;
  • Núñez Vergara, Luis;
  • Rodríguez Bustos, Héctor;
  • Márquez, Amelia;
  • Rodríguez Mellado, J. M.;
  • Blazquez, M.;
  • Roldán, E.;
  • Domínguez, M.;
Abstract
Five N-p-phenyl substituted benzamidines were studied by DC and DP polarography in a wide pH range. Coulometric results show that the overall processes are four-electron reductions. Logarithmic analysis of the waves indicate that the process are irreversible. The influence of the pH on the polarographic parameters was also studied. A UV spectrophotometric study was performed in the pH range 2-13. In basic media some variations in the absorption bands were observed due to the dissociation of the amidine group. A determination of the pK values was made by deconvolution of the spectra. Correlations of both the electrochemical parameters and spectrophotometric pK values with the Hammett substituent constants were obtained.
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URI: https://repositorio.uchile.cl/handle/2250/121221
ISSN: 0010-0765
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COLLECTION OF CZECHOSLOVAK CHEMICAL COMMUNICATIONS 56 (12): 2791-2799
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