In particular, a series ofhomoleptic octahedral
cobalt (II) complexes with bidentate or tridentate azole-pyridine ligands
(where azole is 1,2,4-triazole or substituted pyrazole) have
been recently prepared by non-catalyzed CeNcoupling of azole with
fluoro-, chloro- or bromopyridine or bpy in DMSO in the presence of
potassium tert-butoxide as a base.