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Five novel Ln-1-tza (tetrazole-1-acetic) coordination polymers have been solvothermally synthesized. Complexes Nd(1), Sm(2), Eu(3), Tb(4), Dy(5) are isomorphous, which display a dinuclear structure constructed by nitrate-O-bridged and μ 1,3 carboxyl groups from 1-tza ligand. Variable-temperature magnetic studies reveal that complexes 1 – 5 exhibit antiferromagnetic interactions between lanthanide cations. Photoluminescence studies show that complexes Eu(3) and Tb(4) possess strong luminescence, and compound Nd(1) show characteristic emissions in the near-infrared region. • Five new dinuclear lanthanide complexes based on tetrazole-1-acetic were obtained. • The five complexes are antiferromagnetic interactions. • Eu(3) and Tb(4) possess strong luminescence in the visible region. • Nd(1) shows characteristic emissions in the near-infrared region. Five new lanthanide complexes based on tetrazole-1-acetic ligand and 2,2′-bipyridine as auxiliary ligand have been solvothermally synthesized with the formulas [Ln 2 (1-tza) 2 (NO 3) 4 (2,2′-bipy) 2 ] [Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5), 1-tza = tetrazole 1-acetic and 2,2′-bipy = 2,2′-bipyridine] and structurally characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. The single-crystal X-ray diffraction data reveal that complexes 1 – 5 are dinuclear structures constructed by nitrate-O-bridged and μ 1,3 carboxyl groups from 1-tza ligand, in which each nine-coordinated center Ln(III) ion is in a slightly distorted capped square antiprism geometry. The magnetic behaviors of 1 – 5 have been investigated. The solid-state photoluminescent measurements illustrate that complexes Eu 3 and Tb 4 display the strong fluorescent emissions in the visible region, whereas Nd 1 shows the characteristic near-infrared(NIR) luminescence. In addition, thermogravimetric analysis of Eu 3 is also described. [ABSTRACT FROM AUTHOR]