Abstract
The tunnelling spectra of acridine, acridine- d 9 and phenazine have been investigated in this study. Detailed comparisons of the tunnelling spectra with i.r. and Raman studies of acridine, phenazine, phenazine- d 8, anthracene, anthracene- d 10 and tunnelling data for anthracene are presented. The spectra indicate that acridine and phenazine do not break up on the oxide surfaces of the tunnel junctions. The spectrum of phenazine indicates that phenazine orients with the plane of the molecule parallel to the oxide surface and that an AlN may form between at least one of phenazine's nitrogen atoms and an aluminum atom of the surface. The phenazine spectra contain several vibrational modes which are inactive (forbidden) in the Raman and i.r. spectra of the free molecule. Spectral analysis indicates that acridine is oriented nearly parallel, but with some tilt, to the oxide surface. A tilted orientation could help explain the inhibitory properties of acridine on aluminum in acid media.
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