Azide containing bipyridine complexes of cobalt(III)

Four cobalt(III) azide complexes, [Co(III)(bpy)2(N3)2]X [X = p-toluenesulfonate (1), tetrafluoroborate (2), chloride (3)] and [Co(III)(bpy)2(N3)2][Co(III)(bpy)(N3)4] (4), were prepared under ambient conditions and their structures have been determined. Complex 4 is structurally interesting; it accommodates four azides in the anionic part of the complex. Complexes 1–4 show exothermic processes at <250 °C, and compound 4 reductively decomposes at 221 °C.

Graphical abstractCobalt(III) azide complexes [Co(bpy)2(N3)2]X [X = p-toluenesulfonate (1), tetrafluoroborate (2), chloride (3)] and [Co(bpy)2(N3)2][Co(bpy)(N3)4] (4) are prepared under ambient conditions; their thermal decomposition studies showed exothermic processes around 250 °C.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► [Co(III)(bpy)2(N3)2][Co(III)(bpy)(N3)4] (where bpy = 2,2′-bipyridine) is prepared. ► Thermochemical property of [Co(III)(bpy)2(N3)2]X [X = anions] are studied. ► These complexes undergo exothermic decomposition at <250 °C.