Summary
Complexes [NiL2]X2·nH2O (L=diethylenetriamine; n=O when X=CF3CO2 or CCl3CO2; n=1 when X=Cl or Br, and n=3 when X=0.5SO4 or 0.5SeO4) and NiLX2·nH2O (n=1 when X=Cl or Br; n=3 when X=0.5SO4 or 0.5SeO4) have been synthesised and investigated thermally in the solid state. NiLSO4 was synthesised pyrolytically in the solid state from [NiL2]SO4·[NiL2]X2 (X=Cl or Br) undergo exothermic irreversible phase transitions (242–282° C and 207–228° C; ΔH=−11.3 kJ mol−1 and −1.9 kJ mol−1 for [NiL2]Cl2 and [NiL2]Br2, respectively). [NiL2]-phenomenon (158–185° C; ΔH=2.0 kJ mol−1). NiLX2· nH2O (n=1 or 3) undergo simultaneous deaquation-isomerisation upon heating. All the complexes possess octahedral geometry.
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Koner, S., Ghosh, A. & Chaudhuri, N.R. Thermally induced isomerisation and decomposition of diethylenetriamine complexes of nickel(II) in the solid state. Transition Met Chem 13, 291–296 (1988). https://doi.org/10.1007/BF01025677
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DOI: https://doi.org/10.1007/BF01025677