Electrical and Spectral Properties of Manganese Dichloride Complexes with N-Oxides of Pyridine Derivatives

Polycrystalline complexes of MnCl₂ with N-oxides of pyridine, 2-picoline, and 2,6-lutidine contain a molecule of strongly retained crystallization water; two types of the labile networks of hydrogen bonds are formed on the crystal surface. Under solar radiation the long-lived F-centers are formed in the crystals, imparting a specific color to the compounds. The thermal motion of MnCl₂ complexes with lutidine N-oxide in the unit cells can be described as gas-like motion. At low temperatures the electrical conductivity is predominantly maintained by protons, whereas at high temperatures another mechanism of conductivity arises.