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Molecules 2004, 9(4), 213-222; doi:10.3390/90400213
Article

Structure-Acidity-IR Spectra Correlations for p-Substituted N-Phenylsulfonylbenzamides†

1, 2,* , 3, 3, 1 and 1
Received: 17 September 2003 / Revised: 12 February 2004 / Accepted: 8 March 2004 / Published: 31 March 2004
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Abstract

The wavenumbers of the IR absorption bands of the C=O, S=O and N-H stretching vibrations for a series of p-substituted N-phenylsulfonylbenzamides were measured in trichloromethane. The bond orders, Mulliken charges, charge densities and heats of formation were calculated using the PM3 method. Fifty significant mutual mono parameter (MP) and six dual parameter (DP) correlations were found for the IR spectral, theoretical structural data, substituent constants and previously reported dissociation constants in five polar organic solvents. The transmission of the substituent effects has been discussed and the solvent effect on the slopes of some linear correlations was evaluated using different solvent parameters. The results showed that the factors describing the electronic structure and controlling the dissociation equilibrium and the IR spectra properties of p-substituted N-phenylsulfonylbenzamides must be the same
Keywords: Substituted N-phenylsulfonylbenzamides; IR spectral data; PM3 calculations; MP and DP correlations; substituent and solvent effect. Substituted N-phenylsulfonylbenzamides; IR spectral data; PM3 calculations; MP and DP correlations; substituent and solvent effect.
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Perjessy, A.; Fabian, W.M.; Parik, P.; Ludwig, M.; Loos, D.; Sustekova, Z. Structure-Acidity-IR Spectra Correlations for p-Substituted N-Phenylsulfonylbenzamides†. Molecules 2004, 9, 213-222.

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