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The stoiehiometry of the thermal decomposition and the stereochemistry of the foUowing compounds was studied: NiR4Ct2 (I), NiR4Br2 (lI), NiR412.2H20 (III) and NiR4(NCS)2 (IV) (R=3-pyridylcarbinol, ronicol). In complexes I and II the loss of the volatile ligands (on the TG curves) occurs in three steps (-2R, -R, -R), in complex III in four steps (-2H20, -2R, -R, -R) and in complex (IV) in one step (-4R). According to the quasi-equilibrium decomposition temperatures, the thecmodynamic stability of NiR4X2 complexes can be ordered in the sequence (according to X):CI

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