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 (H 2 O) 4 ] [Ln = Eu ( 1 ), Gd ( 2 ), Tb ( 3 ), Dy ( 4 ); 3-tzba = 3-(1 H -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 1D anionic chains [Ln(3-tzba) 2 (H 2 O) 4 ] − linking the adjacent Cu(I) ions possessing a uninodal 10-connected topology with the short (Schläfli) 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 1 and 3 and the magnetic properties of 2 and 4 were also investigated.