ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Polyvinylpyrrolidone forms complexes with hydrogen halides (HX; X = Cl, Br, I) and halogen molecules (Y2; Y = Br, I). For these compounds a structure is proposed in which the proton is coordinated to the carbonyl groups of two pyrrolidone rings by strong hydrogen bonds. The \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm XY}_{\rm 2}^ \ominus $\end{document}-anion is attached ionically to this complex cation. The structure of these complexes could be elucidated by comparative examination of the Lig2 · HX · Y2-complexes of model compounds such as N,N-dimethylacetamide, N-alkyl-2-pyrrolidones (2a - d), and 1,3-bis(2-oxo-1-pyrrolidinyl)butane (3) and the analogous polyvinylpyrrolidone complexes. The structure of the (N-methyl-pyrrolidone)2 · HI3-complex was examined by X-ray structure analysis. In a similar way the potassium salts (Lig2 · KX · Y2) of the complex acids could be prepared from the ligands, potassium halides, and halogen molecules. Unlike the proton, the potassium cation appears to be only weakly attached to the carbonyl groups of the ligands.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1980.021810909
