ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Heterogeneous reactions of solid nickel(II) complexes. XIX. Enthalpy change and mechanism in thermal decomposition of tetrakis(pyridine)nickel(II) isothiocyanate (Ni(NCS)₂py₄)

I. Horváth and E. Jóna

Institute of Inorganic Chemistry', Centre for Chemical Research, Slovak Academy of Sciences, CS-842 36 Bratislava

Abstract: The kinetics of thermal decompn. of Ni(NCS)₂py₄ was studied by measuring the activation energy, frequency factor, and enthalpy change. The 1st-order kinetics was applicable in the initial stages of the reactions. The decompn. obeyed the rate equation of the contracting area. The enthalpy change ΔH for Na(NCS)₂py₂ is lower than the activation energy, which suggests an endothermal 1-step reaction. The lower activation energy in the decompn. of the title compd. in comparison with ΔH₁ may evidence the formation of a metastable intermediate [Ni(NCS)₂py₃] during decompn.

Full paper in Portable Document Format: 383a371.pdf

Chemical Papers 38 (3) 371–378 (1984)