Synthesis, crystal structure and properties of [Co(L)(2)](ClO4)(2) (L=1,3-bis(1H-benzimidazol-2-yl)-2-oxapropane)

Abstract

The reaction of 1,3-bis(1H-benzimidazol-2-yl)-2-oxapropane (L) with Co(ClO4)(2)center dot 6H(2)O in absolute ethanol yielded the bis[1,3-bis(1H-benzimidazol-2-yl-kappa N-3)-2-oxapropane]cobalt(2+) diperchlorate chelate complex ([Co(L)(2)](ClO4)(2), 1). Complex 1 was characterized by elemental analysis, magnetic moment and molar conductivity measurements, thermogravimetric analysis, FT-IR, UV-Vis and mass spectrometry, and its solid-state structure was determined by single crystal X-ray diffraction. According to the elemental and thermogravimetric analysis data, no water either coordinated or uncoordinated is present in 1. Complex 1 has 1:2 M:L ionic characteristic according to the molar conductivity value. In the complex, the distances between the cobalt and the ethereal oxygen atoms (Co1-O2: 2.805(3); Co2-O1: 2.752(2) angstrom) show semi-coordination bonding and the Co(II) ion is six-coordinated with a N4O2 ligand set, resulting in a distorted octahedron.