Synthesis, structure and fluorescence of a new 1,2,4-triazole-bridging manganese(II) 2D layered framework

A new 2D layered compound, [Mn(L)2(OAc)2]n · nH2O (L = 3-amino-1H-1,2,4-triazole), was hydrothermally synthesized with structure and fluorescence characterized. Four L ligands alternately connect four Mn(II) centers into two kinds of edge-sharing 16-membered rings, whose fuse produces a wave-like 2D layer. The 2D layers are further fabricated into a supramolecular architecture through the hydrogen bondings. With the similar fluorescent features of free L ligand, the title compound produced pale blue fluorescence at 419 nm, which is assigned to π···π∗ intra ligand transition of triazole ring.