Thermally induced isomerisation and decomposition of diethylenetriamine complexes of nickel(II) in the solid state |
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Authors: | Subratanath Koner Ashutosh Ghosh Nirmalendu Ray Chaudhuri |
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Institution: | (1) Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 700032 Calcutta, India |
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Abstract: | 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; H=–11.3 kJ mol–1 and –1.9 kJ mol–1 for NiL2]Cl2 and NiL2]Br2, respectively). NiL2]-phenomenon (158–185° C; H=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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