THERMOCHEMICAL PROPERTIES OF NEUTRAL COMPLEXES IN LAYER SILICATES I -[NI(4-ETPY)(4)(NCS)(2)] COMPLEX IN MONTMORILLONITE AND PILLARED MONTMORILLONITES

The stoichiometry of thermal decomposition and enthalpy and structural changes were studied for the compounds formed by penetration of [Ni(4 -Etpy)(4)(NCS)(2)] (I) into Ca-montmorillonite (II) or Cr-, Zr- and Al -pillared analogues (III, TV and V, respectively). The mass fractions of complex I in II, III, IV or V are different. It was found for all s tudied compounds that the release oft (L=4-Etpy) is a three-step proce ss (-2L, -1L, -1L), and differences occurred in enthalpy changes (Delt a H in kJ per mole of I) corresponding to the individual processes. Th ese differences and the changes in diffraction and spectral properties of the species formed after intercalation are assumed to have their r oots in different intramolecular guest-host interactions in the studie d compounds.