The Specific Conductance and NMR Spectra of Fused Pyridinium Salts

The specific conductance of pyridinium HCl , N‐methylpyridinium chloride, N‐methylpyridinium bromide, 4‐methylpyridinium bromide, and pyridinium bromide, was measured as a function of temperature. The NMR spectra of the first three fused salts were also measured over the same temperature ranges. Correlations between conductance data and spectral data were found to exist. The experimental results indicate that the “friction” between the chloride and pyridinium ion is greater than between the bromide and the pyridinium ion. The positive charge of the pyridinium ion seems to be localized on the nitrogen. In the pyridinium HCl system the labile proton is probably contributing to the conductivity.