Synergetic spin singlet-quintet switching and luminescence in mononuclear Fe(II) 1,3,4-oxadiazole tetradentate chelates with NCBH co-ligand.

We report the multi-step synthesis of the tetradentate 2-(naphthalen-2-yl)-5-[,-bis(2-pyridylmethyl)aminomethyl]-1,3,4-oxadiazole ligand (LTetra-ODA) along with its corresponding [Fe(LTetra-ODA)(NCBH)]·1.5CHOH (C1) complex, which is the first mononuclear 1,3,4-oxadiazole based Fe(II) spin crossover (SCO) complex, and its zinc analogue [Zn(LTetra-ODA)(NCBH)]·0.5HO (C2).