Evidence for a single minimum potential for hydrogen bonds of pyridine N-oxide complexes with dichloroacetic acid in dichloromethane

Add time:07/14/2019    Source:sciencedirect.com

FTIR spectra of dichloracetic acid and its eight complexes with substituted pyridine N-oxides and N,N-dimethylaniline in dichloromethane-d2 are reported. 4-N,N-dimethylaminopyridine N-oxides form two types of complexes with dichloroacetic acid; the acid interacts with NO or Me2N groups. The shape of the second derivative of absorption in the carbonyl region implies that the hydrogen bonds are described by a strongly asymmetrical quasi-single minimum potential. The situation with regard to the observed carbonyl frequencies as related to conformational equilibria is reviewed.

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