THERMAL-DECOMPOSITION REACTIONS OF NICKEL(II) COMPLEXES UNDER QUASI-EQUILIBRIUM CONDITIONS .3. THE STUDY OF THE RELATIONS BETWEEN THE THERMAL, SPECTRAL AND STRUCTURAL-PROPERTIES OF THE WERNER CLATHRATES [NI(4-MEPY)4(NCS)2].2G (WHERE G REPRESENTS NAPHTHALENE DERIVATIVES)

The relationship between the quasi-equilibrium decomposition temperature T(D), the band shift DELTAnu(3A2g-->3T1g) in the electronic spectra and the degree of tetragonal distortion (R(e)/R(a)) of the host complex in the [Ni(4-Mepy)4(NCS)2] . 2G clathrates (where G is 1-methyl-, 2-methyl-, 1-bromo-, and 2-bromonaphthalene) was studied. It was found that with increasing T(d) the positive band shift also increases, whereas the degree of tetragonal distortion of the coordination polyhedra decreases. The reasons for these differences are discussed.