A convenient method for the preparation of 3-(2-pyridyl)triazolo[1,5-a]pyridine (L). Crystal structures of L and [CuL2(OH2)2][NO3]2

The compound 3-(2-pyridyl)triazolo[1,5-a]pyridine (L) was synthesized under mild conditions by refluxing equimolar amounts of hydrazine and di-2-pyridyl ketone in methanol–water. It has been characterized by X-ray diffraction and used as a ligand in two metal complexes, [ML2(OH2)2][NO3]2(M = Cu or Co). The crystal structure of the copper derivative, which is the first example of a triazolopyridine complex, has also been determined.