Infrared spectroscopic study of the solvation of tetramethylurea in protic plus aprotic mixed solvents

被引：25

作者：

Behbehani, GR ^{[1
]}

Dillin, M ^{[1
]}

Smyth, J ^{[1
]}

Waghorne, WE ^{[1
]}

机构：

[1] Univ Coll Dublin, Dept Chem, Dublin 4, Ireland

来源：

JOURNAL OF SOLUTION CHEMISTRY | 2002年 / 31卷 / 10期

关键词：

infrared spectroscopy; preferential solvation; urea; aqueous DMSO; acetonitrile; methanol;

D O I：

10.1023/A:1021397327617

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 tetramethylure. 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.

引用

页码：811 / 822

页数：12