Two-dimensional Cu(II)/Cd(II) complexes with double bridged [(μ-EO-N3)(μ-N-N-tetrazolate)] chains: Crystal structures, magnetic behavior and luminescence properties

• Two Cu(II)/Cd(II) compounds with (μ-EO-N3)(μ-N-N-tetrazolate) bridges, have been synthesized.
• The magnetic properties of Cu(II) compound were studied.
• The mixed double bridges transmit antiferromagnetic couplings between Cu(II) ions.
• The emission spectrum of the Cd(II) complex were studied.
• An blue-shift was observed in Cd(II) complex compared with the emission of the free ligand.

Two novel two-dimensional (2D) compounds of 3-(5-tetrazolate)-N-oxide-pyridine (L) and azide, have been synthesized and characterized. They are of formula [Cu(II)(L)(N3)]·0.5H2O (1) and [Cd(II)(L)(N3)·(H2O)]·0.5H2O (2). Both compounds 1 and 2 consist of 2D layers with similar double-bridged ((μ-EO-N3)(μ-N-N-tetrazolate), EO = end-on) one-dimensional (1D) chains being linked by the N-oxide-pyridine ligands. However, compounds 1 and 2 crystallize in different space group (C2/c (1), P21/c (2)) and exhibit different coordination geometry of central metal ions (square pyramidal (1), octahedral (2)). Magnetic investigations suggest that the mixed double [(μ-EO-N3)(μ-N-N-tetrazolate)] bridges in compound 1 transmit antiferromagnetic couplings between Cu(II) ions (J = −16.1 cm−1 above 46 K). And also, the emission spectra of the L ligand and complex 2 were studied in the solid state at room temperature, and an obvious blue-shift was observed in complex 2 compared with the emission of the free L ligand.

Two novel two-dimensional (2D) compounds of Cu(II)/Cd(II) with 3-(5-tetrazolate)-N-oxide-pyridine (L) and azide have been synthesized and their structures and properties have been investigated. The mixed double [(μ-EO-N3)(μ-N-N-tetrazolate)] bridges in compound 1 transmit antiferromagnetic couplings and an obvious blue-shift was observed in compound 2 compared with the emission of the free L ligand.Figure optionsDownload as PowerPoint slide