Author(s)

Sawsan Mohamed Al-Ashqar

Department of Chemistry, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, KSA.

The reactions of N-(O-hydoxyphenyl)-N'-phenylthiourea (L) derived from with Cu⁺, Cu²⁺, Co²⁺ and Co³⁺ chloride and/or iodide afford new metal complexes. The isolated complexes were synthesized by two different techniques (chemical and tribochemical methods). Two complexes were synthesized by the direct chemical reactions of N-(O-hydoxyphenyl)-N'-phenylthiourea (L) with MCl₂·XH₂O (M = Co²⁺ and Cu²⁺; X = 6 in case of Co²⁺ and X = 2 in case of Cu²⁺) in absolute EtOH. The general formulae of the two complexes derived by the chemical method are [Cu(L)₂(EtOH)₂]Cl₂ and [Co(L)₂Cl₂]Cl. These complexes were used to synthesize another two complexes using tribochemical reaction by grinding the previous chloride complexes with excess KI in agate mortar in the solid state. The isolated complexes have the general formulae, [Cu(L)I·H₂O]·1/2H₂O and [Co(L)I₃(Et- OH)]·3EtOH. The results indicate the substitution of the chloride by iodide ions during grinding and extraction of the complexes by solvents. The IR spectra of the complexes suggest that L acts in a bidentate manner towards the metal ions. Moreover, the results of electronic spectra and magnetic measurements for the chloride complexes suggest distorted-octahedral structure for Cu²⁺ and low-spin octahedral structures around the Co^II and Cu²⁺ ions, respectively. On the other hand the data suggest that the iodide complexes have square-planer and low-spin for the Cu⁺ and Co³⁺ ions, respectively. The results of mass spectra confirm the formulae proposed for the isolated complexes. The mechanisms of reduction of Cu^II and oxidation of Co^II for the metal complexes were elucidated.

Tribochemical Reactions, Derivatives of Thiourea Complexes, Cu2+ and Co3+ Complexes

Al-Ashqar, S. (2016) Comparative Studies between Chemical and Tribochemical Reactions of Some Metal Complexes Derived from N-(O-Hydoxyphenyl)-N'-phenylthiourea (L). Open Journal of Inorganic Chemistry, 6, 195-204. doi: 10.4236/ojic.2016.63015.