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 CuI, CuII, CoII, and CoIII 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 = CoII and CuII) 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 CuII ion, high-spin octahedral and/or tetrahedral geometries around the CoII ion, and low-spin octahedral and tetrahedral geometries for CoIII and CuI 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 CuII and oxidation of CoII for the metal complexes are discussed.