Physicochemical Properties of Complexes of Zinc Iodide with Pyridine N-Oxides

摘要

Polycrystalline 1:2 complexes of ZnI_2 with N-oxides of pyridine, picoline, and 2,6-lutidine were studied by IR spectroscopy, dielectrometry, and conductometry. An equilibrium between three solid phases was observed. These phases are characterized by different enthalpies of formation of intermolecular bonds and different mechanism of electronic effect transmission via these bonds. Gas-like thermal molecular motion in one of the phases of the 2,6-lutidine N-oxide complex was observed. Reversible chemical reactions on the surface of the crystalline 3-picoline N-oxide complex are initiated on exposure to an alternating electric field. Two complexes, similarly to the ZnZl_2 complexes, are ionized in the cumulative mode on fast heating from 18-19 to 26-45 deg C. Partial activation energies of electrical conductivity of different ions were determined for a number of complexes and inorganic salts.