Synthesis, Thermal Analysis, and Thermodynamic Properties Study of New Quinoline Derivative and Their V(IV), Co(II), and Cu(II) Complexes

Raghad Jawad Kadhim Aldoghachi (Department of Pharmaceutical Chemistry, University of Basrah, 61004, Basrah, Iraq)
Faris Abdulridha Jassim Aldoghachi (Department of Chemistry, Faculty of Science, University of Basrah, 61004, Basrah, Iraq)
Tahseen Abdul Qader Alsalim (Department of Chemistry, Faculty of Education, University of Basrah, 61004, Basrah, Iraq)
Mohd Lokman Ibrahim (School of Chemistry and Environment, Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, Selangor 40450, Malaysia)

Indonesian Journal of Chemistry
Vol 22, No 5 (2022)

A new ligand (E)-2-((2-chloro-6-methylquinoline-3-yl)methylene)-N'-((E)-(2-chloro-6-methylquinoline-3-yl)methylene)hydrazine-1-carbothiohydrazide (QH) was prepared by reacting hydrazine hydrate with carbon disulfide to yield thiocarbohydrazide. The thiocarbohydrazide in the second step was treated with a quinoline derivative 2-chloro-6-methylquinoline-3-carbaldehyde to yield the ligand. The ligand was identified by spectroscopic techniques FTIR, 1H-NMR, and 13C-NMR. Next, vanadium (V), cobalt (Co), and copper (Cu) complexes were prepared in the [M:L] ratio of 1:1 (QV, QCo, QCu). The complexes were characterized using FTIR, ESI, magnetic susceptibility, and molar conductivity. The thermal analysis (TGA) of V(IV), Co(II), and Cu(II) complexes were studied. The activation thermodynamic parameters, such as the energy of activation, enthalpy, entropy, and free energy change of the complexes, were evaluated, and the stabilities of the thermal decomposition of the complexes were discussed.