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Structure-Acidity-IR Spectra Correlations for p-Substituted N-Phenylsulfonylbenzamidesâ€

Author(s): Alexander Perjessy | Walter M.F. Fabian | Patrik Parik | Miroslav Ludwig | Dusan Loos | Zora Sustekova

Journal: Molecules
ISSN 1420-3049

Volume: 9;
Issue: 4;
Start page: 213;
Date: 2004;
Original page

Keywords: Substituted N-phenylsulfonylbenzamides | IR spectral data | PM3 calculations | MP and DP correlations | substituent and solvent effect.

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