Characterization and Evaluation of Standard Enthalpy of Vaporization and Kinetic Studies of Volatile bis(N-ethyl-5-methyl-salicylaldimine)nickel(II) Complex

The bis(N-ethyl-5-methylsalicylaldimine)nickel(II) [Ni(5-me-saletN) sub( 2)] complex was synthesized and characterized by elemental analyses, FT-IR, TG-DTA, mass spectrometry and vapour pressure measurement studies. The TG curve of the complex showed a single-step weight loss commencing from 490 K to nil residue at 600 K, without competing fragmentation step. The non-isothermal vaporization activation energy value determined by Coats-Redfern method yielded the value of 93.5 plus or minus 7 kJmol super( -1). The dynamic TG run proved the complex to be completely volatile. And the equilibrium vapour pressure (P sub( e)) sub( T) of the complex over the temperature range of 421 K-524 K, determined by the TG-based transpiration technique yielded the value of 94.2 plus or minus 1.2 kJmol super( -1) for its standard enthalpy of vaporization ( Delta sub( sub)H degrees). The entropy of vaporization ( Delta sub( sub)S degrees) was calculated from the intercept and found to be 249.4 plus or minus 2.6 Jmol super(-1).K super( -1).