Synthesis, characterization and single crystal X-ray structures of 2-pyridyl bis(pyrazineamino)methane and bis[2-pyridyl(pyrazineamino)methanolato]-cobalt(m) perchlorate : A consequence of cobalt ion-assisted oxidative deamination of 2-pyridyl bis(pyrazineamino)methane

摘要

A new Schiff base, 2-pyridyl bis(pyrazineamino)methane (L1) has been synthesized and characterized by elemental analysis, spectroscopic investigations and singfe crystal X-ray diffraction measurements. Reaction of cobalt(II) perchlorate hexahydrate with two molar equivalents of L1 under ambient conditions resulted concurrent oxidation of divalent Co~(II) metal ion with oxygenation and deamination of the animal polydentate ligand to produce bis[2-pyridyl(pyrazineamino)methanolato]cobalt(III) perchlorate trihydrate designated as [Co(L2)]ClO4.3H2O (1). The complex 1 is also characterized by spectroscopy, elemental analysis and X-ray crystallography. X-Ray crystal structure of the complex cation, [Co(L2)2]~+) shows that the two L2 ligands are coordinated to the central cobalt(III) metal ion in a facial mode to afford a slightly distorted octahedral geometry. The two pyridyl and two pyrazine N atoms constitute the equatorial plane on which the cobalt(III) ion lies whereas methanolate O atoms occupy the axial positions.