Synthesis of Some Metal Complexes Derived From 6-Furfuryl Aminopurine (Kinetin; Kin) by Chemical and Tribochemical Reactions

Abstract

New metal complexes derived from the reaction of 6-furfurylaminopurine (kinetin [Kin]) with Cu^I, Cu^II, Co^II, and Co^III chlorides were synthesized by conventional chemical and tribochemical methods. Five of these complexes were synthesized by the direct reaction of 6-furfurylaminopurine with MCl₂.6H₂O (M = Co^II and Cu^II) using the conventional chemical method in absolute EtOH. All the isolated solid complexes with the general formulae, [Cu₂(Kin)₂Cl₂]Cl₂.2EtOH, [Cu(Kin)Cl₂(H₂O)₂].0.5H₂O, [Co(Kin)Cl₂], [Co₂(Kin)Cl₄(H₂O)₃EtOH], and [Co₂(Kin)Cl₄].H₂O (Kin = 6-furfurylaminopurine), have been isolated and characterized. These complexes were used to synthesize another five metal complexes using tribochemical reaction by grinding the previous five metal complexes with excess KI in agate mortar in the solid state. Also, the results indicated the substitution of the chloride by iodide ions during grinding and extraction by solvents. The IR spectra of the complexes suggested that the ligand acted in a bi- and/or tridentate manner towards the metal ions. Moreover, the results of electronic spectra and magnetic measurements for the complexes suggested distorted-octahedral and/or tetrahedral structures around the Cu^II ion, high-spin octahedral and/or tetrahedral geometries around the Co^II ion, and low-spin octahedral and tetrahedral geometries for Co^III and Cu^I complexes. Thermal measurements suggested the mechanism of decomposition. 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 are discussed.

Keywords:

• Cu(I) and Co(III) complexes
• kinetin complexes
• mechanisms of reduction of Cu(II) and oxidation of Co(II)
• tribochemical reactions