TITLE:
Characterization and Evaluation of Standard Enthalpy of Vaporization and Kinetic Studies of Volatile bis(N-ethyl-5-methyl-salicylaldimine)nickel(II) Complex
AUTHORS:
Thevabakthi Siluvai Muthu Arul Jeevan, Maria Francis George Johnson, Atnafu Guadie Assefa, Sebastian Arockiasamy, Karachalacheruvu Seetharamaiah Nagaraja
KEYWORDS:
Nickel Complexes, Enthalpy of Vaporization, Thermogravimetry, Vapour Pressure, Kinetic Studies
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.6 No.2,
January
20,
2015
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•K–1.