Thermal Properties of the Complex of bis-iso-butanediamine Nickel(II) Chloride, [Ni(i-bn)2]Cl2.

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[Ni(i-bn)2]Cl2, was isomerized thermally from a square planar structure to a cis octahedral one by the coordination of counter ion, Cl-, at around 180-190°C, where i-bn is isobutanediamine (2-methyl-1, 2-propanediamine). The isomerization was accompanied by thermochromism from yellow to light blue. When the yellow complex was permitted to stand for a few hours in air, it was converted to trans-[Ni(H2O)2(i-bn)2]Cl2·2H2O and the color changed from yellow to violet.The dehydration of trans-[Ni(H2O)2(i-bn)2]Cl2·2H2O took place simultaneously with the anation of Cl- ions at around 50°C. On the dehydration-anation, the structure of the complex changed from a trans octahedral to a cis octahedral without forming the square planar structure, and the color changed from violet to light blue.The isomerization of [Ni(i-bn)2]Cl2 and the dehydration-anation of trans-[Ni(H2O)2· (i-bn)2]Cl2·2H2O were considered to be the Avrami-Erofe'ev type reactions, and the activation energies were evaluated to be 305.7 and 59.2kJ mol-1, respectively.
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