Collect. Czech. Chem. Commun. 1988, 53, 3097-3107

Conformational structure of poly[2-(dimethylamino)ethyl methacrylate], 2-(dimethylamino)ethyl pivalate and of their quaternary iodides. Vibrational and NMR spectra

Bohdan Schneider, Jan Štokr, Jaroslav Straka, Martin Přádný and Stanislav Ševčík

Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6


Raman, infrared, and 1H and 13C NMR spectra of 2-(dimethylamino)ethyl pivalate, 2-(pivaloyloxy)ethyltrimethylammonium iodide, poly[2-(dimethylamino)ethyl methacrylate] and of its quaternary iodide were measured. Spectral analysis revealed that in crystalline 2-(dimethylamino)ethyl pivalate and in its quaternary salt, the 2-(dimethylamino)ethyl group exists in the g conformational state. In the liquid state, these compounds also contain a smaller amount of the t conformational structure of the 2-(dimethylamino)ethyl group. In poly[2-(dimethylamino)ethyl methacrylate] and in its quaternary iodide in solution, the population of the g and t conformational structures are similar to those found in 2-(dimethylamino)ethyl pivalate and in its quaternary iodide.