Infrared Investigation of the Interaction Between Diphenylketimine and Proton Donors

The thermodynamic data for the interaction between diphenylketimine and phenols are determined in carbontetrachloride solution by infrared spectroscopy. Complex formation brings about a frequency increase of the nu(NH) vibration. From a pK(a) value of the proton donor of 6, proton transfer takes place

X-ray and vibrational studies of 8-aminoquinoline. Evidence for a three-center hydrogen bond

The x-ray structure of 8-aminoquinoline indicates that one of the NH bonds of the NH2 group forms a three-center hydrogen bond, the major component being the intramolecular hydrogen bond and the minor component the intermolecular hydrogen bond. The IR and Raman spectra of 8-aminoquinoline and of its N-deuterated counterpart reflect the non-equivalence of the two NH(D) bonds and the weakness of the hydrogen bridge. (C) 1997 John Wiley & Sons, Ltd