150
CZAKIS-SULIKOWSKA et al.: 2,4’-BIPYRIDINE-OXALATO COMPLEXES
Some processes of elimination of water and 2,4’-bipy, as well as of elimination of
2,4’-bipy and decomposition of oxalate partially overlap for Co(II), Ni(II) and Cu(II)
compounds, without no clearly separated steps.
Generally the intermediate compounds (Mn(ox), Ni(ox), Cu(ox) and 2Co(ox)L1.5)
decompose in our experimental conditions with an exothermic effect. The decarboxy-
lation peak in air is endothermic, however DTA signals are more complicated in result of
the oxidization reactions.
* * *
We thank Dr. J. Ka³u¿na-Czapliñska for performing some investigations.
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