The reaction of pyridine with the high-spin Fe(III) layer compound FeOCl gives rise to well defined intercalation compounds which have previously been examined by detailed 57Fe temperature dependent Mössbauer effect studies. These studies have shown the presence of Fe(II) in the lattice resulting from electron transfer from the guest to the host species. The presence of pyridinium ion and 4,4′ bipyridine, postulated as originating from the redox intercalation process, as well as of the parent pyridine, in the host matrix, is inferred from the observation of characteristic absorptions in the infrared spectra of the intercalation compounds. Fourier transform IR spectra at 2 cm−1 resolution have been obtained at room temperature for a number of pyridine intercalates of FeOCl, and the IR spectroscopic characterization of these samples is found to be in good agreement with the results obtained from the 57 Fe Mössbauer effect studies in the temperature range 78≤T≤300 K.
The ignition delay of turpentine is not affected by the proportion of oxidizing agent added. The delay is reduced by addition to the nitric acid of oleum up to a certain concentration or by addition of catalysts in the order Fe C1 > N H ,VO > Cu C1 but is increased by dilution with petroleum.
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