175291-82-4Relevant academic research and scientific papers
Thermal studies of N,N′-diethylethane-1,2-diarnine complexes of nickel(II) in the solid state
Pariya, Chandi,Ghosh, Ashutosh,Chaudhuri, Nirmalendu Ray
, p. 185 - 193 (2008/10/09)
NiL2X2·nH2O (where L = N,N′-diethylethane-1,2-diamine; n = 2 when X is Cl-, Br-, I-, NO3-, 0.5SO42-, 0.5SeO42- or CF3SO3-; n = 0 when X is CF3CO2- or CCl3CO2-) have been synthesised from solution and investigated by TG-DTA and DSC in the solid state. All the hydrated complexes have trans octahedral geometry and on heating undergo dehydration-anation reactions. The dehydrated complexes are also trans octahedral, except NiL2X2 (X is NO3-, 0.5SO42- or 0.5SeO42-) for which cis octahedral geometry is proposed. [NiL2(H2O)2]X2 (X is Br- or CF3SO3-) shows thermochromism (blue → green) upon dehydration. NiL2X2 (X is Cl-, Br-, 0.5SO42- or 0.5SeO42-) yield mono-diamine species in the solid state on heating. NiL2SO4 undergoes a reversible phase transition (heating cycle, 178-193°C, ΔH = - 4.0k J mol-1; cooling cycle, 186-172°C; ΔH = 4.0kJ mol-1) without a visual colour change.
