Infrared Spectroscopic Study of the Solvation of Tetramethylurea in Protic + Aprotic Mixed Solvents |
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Authors: | G. Rezaei Behbehani Marie Dillon Jennifer Smyth W. Earle Waghorne |
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Affiliation: | (1) Department of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland |
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Abstract: | The infrared spectra of tetramethylurea have been measured in mixtures of dimethylsulfoxide or acetonitrile with D2O or deuterated methanol (CH3OD). Marked solvatochroism is observed for bands associated with the C=O and C–N stretches of tetramethylurea, with the former moving to lower wavenumber, and the latter to higher, as the concentration of the protic component is increased. The C=O band shows four distinct absorbances, which are attributed to non-, mono, di-, and trihydrogen bonded tetramethylurea. The relative populations of the different hydrogen bonded species were determined from analyses of the C=O band shapes. It is found that the variations in the populations of the different hydrogen bonded species can be accounted for by a simple mass action treatment. |
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Keywords: | Infrared spectroscopy preferential solvation urea aqueous DMSO acetonitrile methanol |
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