| Popis: |
The preparation and some properties of complexes of pyrazinecarboxylic acid with manganese, iron, cobalt, nickel and copper are described. Magnetic measurements, electronic and infrared spectra indicate that coordination takes place through the carboxyl group and a nitrogen atom of the aromatic ring. Electrical conductivity measurements made at room temperature yield conductivity values ranging from 1.7 × 10 −13 Ω −1 m −1 to 1.9 × 10 −8 Ω −1 m −1 . Iron and nickel complexes show transitions from ohmic to space charge limited conduction. The temperature dependences of conductivity are measured and discussed. |
