THERMAL-DECOMPOSITION REACTIONS OF NICKEL(II) COMPLEXES UNDER QUASI-EQUILIBRIUM CONDITIONS .2. STUDY OF THE RELATIONS BETWEEN THERMAL, SPECTRAL AND DIFFRACTION PROPERTIES OF THE WERNER CLATHRATES [NI(4-MEPY)4(NCS)2].G, (G = BENZENE, TOLUENE, P-XYLENE)

The stoichiometry of thermal decomposition and thermal (thermodynamic) stability was studied for the Werner clathrates [Ni(4-Mepy)4(NCS)2].G, where G = benzene(I), toluene(II) and p-xylene(III). The loss of the volatile components occurs in five steps in compounds I and II and in four steps in the complex III. According to the quasi-equilibrium data the thermodynamic stability of these compounds can be ordered in the following sequence: I<II<III. The increasing host-guest interaction (larger positive band shift in the visible spectra) was accompanied by increasing in the quasi-equilibrium temperature (T(D)) for the complexes under study.