Synthesis, Characterization, Thermal, and Electrochemical Properties of Co(II) and Cu(II) Pseudohalide Complexes with 2-mercapto-3-phenyl-quinazolin-4(3H)-one and ethylendiamine or 1,10-phenanthroline as Ligands

Abstract

Several complexes of the type [M(L)(en or phen)(H₂O)X] (1a-4a and 1b-4b); where M = Co(II) and Cu(II); L = 2-mercapto-3-phenyl-quinazolin-4(3H)-one; en = ethylenediamine, phen = 1,10-phenanthroline; X = N⁻ ₃ and NCS⁻ have been prepared and characterized. The complex formation occurred through both nitrogen and sulphur atom of the ligand L. Electronic spectra and magnetic moment values suggest octahedral geometry for all complexes. The thermal behavior of the complexes revealed that the phen complexes are thermally more stable than the en complexes. The electrochemical behavior of the Cu(II) complexes showed that phen complexes appeared at more positive potential than corresponding en complexes.

Keywords:

• mixed ligands
• quinazolinone derivatives
• thermal studies
• cyclic voltammetry

One of the authors (VAS) is thankful to Council of Scientific and Industrial Research (CSIR), New Delhi for awarding Senior Research Fellowship. Authors are also thankful to Regional Sophisticated Instrumentation Centre (RSIC), IIT Mumbai for providing ESR facilities.