A tetrameric cobalt(II) cluster of 7-azaindole

Abstract

The synthesis and properties of the tetrameric cobalt(II) complex [Co₄O(C₇H₅N₂)₆], where C₇H₅N₂-is the anion of 7-azaindole (1H-pyrrolo[2,3- b]pyridine), are reported. A tetrameric molecular structure is indicated by the mass spectrum. The electronic spectrum is consistent with a tetrahedral environment about each cobalt atom. The compound displays antiferromagnetic behaviour which conforms to simple Heisenberg theory over the liquid nitrogen temperature range. The fitted exchange constant J is c. -16 cm^-1.