Synthesis, characterisation and solid state thermal behaviour of nickel (II) diamine complexes

Abstract

[NiL₂X₂] (L = N,N′-dimethyl-1,2-ethanediamine; X = Cl⁻, CF₃CO₂⁻, CC1₃CO₂⁻ and CBr₃CO₂⁻), [NiL₂C₂O₄] • H₂O and [NiL₂X₂] • 2 H₂O (X = Br⁻, 0.5 SO₄²⁻ and 0.5 SeO₄⁻) have been synthesised and their thermal studies carried out. Thermally induced phase transition phenomena are noticed in [NiL₂X₂] (X = CF₃CO₂⁻ and CCl₃CO₂⁻) and their probable mechanisms are described. [NiL₂X₂] (X = Br⁻, 0.5 SO₄²⁻ and 0.5 SeO₄²⁻) and [NiLX₂] (X = Cl⁻, 0.5 C₂O₄²⁻ and 0.5 SO₄²⁻) have been prepared by solid state pyrolysis from the respective parent diamine complexes. [NiL₂X₂] have been made in solid state by temperature arrest technique from [NiL₂ (CX₃CO₂)₂] (X = Cl⁻ and Br⁻).