FORMATION OF H-BONDED IONIC ASSOCIATES IN REACTIONS OF 5-NITROSALICYLALDEHYDE WITH SECONDARY-AMINES

5-Nitrosalicylaldehyde reacts with highly basic secondary aliphatic am ines to form molecular complexes of 1 : 1 composition. The complexes w ith piperidine, diethylamine, dipentylamine, and dibenzylamine (1-4, r espectively) have been obtained in the crystalline state and character ized. The X-ray diffraction structural analysis of complex 1 demonstra ted that it exists in a crystal as an H-bonded dimeric ionic associate [C5H12N+. C7H4NO4-](2) formed as a result of the transfer of the phen yl proton of the aldehyde to the piperidine N atom. According to the r esults of IR spectroscopy, the other complexes obtained have similar s tructures.