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

Abstract

The bis( N -ethyl-5-methylsalicylaldimine)nickel(II) [Ni(5-me-saletN) 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 ± 7 kJmol – 1 . The dynamic TG run proved the complex to be completely volatile. And the equilibrium vapour pressure of the complex over the temperature range of 421 - 524 K, determined by the TG-based transpiration technique yielded the value of 94.2 ± 1.2 kJmol – 1 for its standard enthalpy of vaporization . The entropy of vaporization was calculated from the intercept and found to be 249.4 ± 2.6 Jmol – 1 &bull; K – 1 .