Schwingungsspektroskopische Untersuchung der Wechselwirkung von Metallkationen mit Dimethylformamid

The interaction of a series of cations with dimethylformamide is investigated using IR spectroscopy. The complexation of a cation by the amide is shown to weaken the C=O bond and to enforce both C–N and C–H bonds of the ligand. These results are in agreement withCNDO/2 calculations on force constants and vibration frequencies. The IR results, which can reflect only qualitative trends concerning the changes of the bonding situation in the ligand molecule upon metal ion complexation, are compared with the more accurate data obtained in recent NMR line shape investigations.