Thermochemical Properties of Neutral Complexes in Layer Silicates I. [Ni(4-Etpy)4(NCS)2] complex in montmorillonite and pillared montmorillonites |
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Authors: | Jóna E. Kubranová M. Sirota A. Šimon P. |
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Affiliation: | (1) Faculty of Industrial Technologies, 020 32, Púcho, Slovakia;(2) Institute of Inorganic Chemistry, Slovak Academy of Sciences, 842 36 Bratislava, Slovakia;(3) Department of Inorganic Chemistry, Slovak Technical University, 812 37 Bratislava, Slovakia;(4) Department of Physical Chemistry, Slovak Technical University, 812 37 Bratislava, Slovakia |
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Abstract: | 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, IV and V, respectively). The mass fractions of complex I in II, III, IV or V are different. It was found for all studied compounds that the release of L (L=4-Etpy) is a three-step process (-2L, -1L, -1L), and differences occurred in enthalpy changes (δH in kJ per mole of I) corresponding to the individual processes. These differences and the changes in diffraction and spectral properties of the species formed after intercalation are assumed to have their roots in different intramolecular guest-host interactions in the studied compounds. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | montmorillonite-Ni(II) neutral complex |
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