Two isomeric ligands Htzpya and Hpytza (Htzpya ¼ 3-(5-tetrazolyl)pyridine-1-acetic acid, Hpytza ¼ 5-(3-pyridyl) tetrazole-2-acetic acid) have been selected to react with DyCl 3 Á6H 2 O or PrCl 3 Á6H 2 O under hydrothermal conditions, resulting in the formation of four new coordination compounds, mononuclear [Dy(tzpya) 2 (H 2 O) 5 ]ClÁ4H 2 O (1), dinuclear [Pr 2 (tzpya) 2 (H 2 O) 12 ]Cl 4 Á2H 2 O (2), and two one-dimensional polymers [Dy(pytza) 2 Cl(H 2 O) 2 ] n (3) and [Pr(pytza) 2 Cl (H 2 O) 2 ] n (4), whose structures are controlled by the different positions of the carboxylate group. These compounds were characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. Compounds 1-4 are self-assembled to form three-dimensional network structures by hydrogen bonding interactions. Furthermore, the luminescence properties were also investigated at room temperature in the solid state.

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The title compound, C14H12O4, is a deoxy­benzoin derivative in which the dihedral between the carbonyl group and the catechol unit is 5.99 (3)°. The dihedral angle between the two benzene rings is 60.26 (13)°. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds connect mol­ecules, forming a two-dimensional network. In addition, weak inter­molecular C—H⋯O hydrogen bonds and C—H⋯π contacts further stabilize the crystal structure.