The kinetics of the thermally induced isomerization of some nickel(II) complexes containing butanediamines in a solid phase - Masuda, Y.; Matsuda, T.; Kume, H.; Ihara, Y. (Elsevier)
The nickel(II) complexes, [Ni(1,2-bn)"2]X"2 and [Ni(m-bn)"2](NO"3)"2, where 1,2-bn and m-bn are 1,2-butanediamine and meso-2,3-butanediamine, respectively, and X is Cl^- or Br^-, are thermally isomerized from a square planar to an octahedral structure by anation of counter ions in the solid phase. The kinetics of the isomerization was studied on the basis of the results of differential scanning calorimetry.The isomerizations of 1,2-bn complexes with Cl^- and Br^- are considered to be first-order reactions (f"1]). The activation energies for the isomerizations of chloride and bromide complexes were 227 +/- 4 and 214 +/- 10 kJ mol^-^1, respectively. The isomerization of m-bn complex with NO^-"3 proceeded as an Avrami-Erofe'ev-type reaction (A"2), and the activation energy was 321 +/- 10 kJ mol^-^1.
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