A New Family of 3d-4f Heterometallic Tetrazole-based Coordination Frameworks: In Situ Tetrazole Ligand Synthesis, Structure, Luminescence, and Magnetic Properties

A series of novel three-dimensional (3D) Ln(III)-Cu(I) heterometallic tetrazole-based coordination frameworks, namely, [LnCu(3-tzba)(2)(H2O)(4)] [Ln = Eu (1), Gd (2), Tb (3), Dy (4); 3-tzba = 3-(1H-tetrazol-5-yl)benzoate], were successfully synthesized through in situ [2 + 3] cycloaddition reaction under hydrothermal conditions. Compounds 1-4 are isostructural 3D coordination frameworks with ID anionic chains [Ln(3-tzba)2(H2O)(4)](-) linking the adjacent Cu(I) ions possessing a uninodal 10-connected topology with the short (Schlafli) vertex symbol of (3(12).4(24).5(9)). To the best of our knowledge, they are the first lanthanide-transition heterometal-organic coordination frameworks obtained through in situ tetrazole synthesis. In addition, the luminescence properties of I and 3 and the magnetic properties of 2 and 4 were also investigated.