A new complex [Zn(OH2)(HDPA)2]·3H2O 1 (H2DPA = 2,6-pyridine-dicarboxylic acid) has been prepared at room temperature from the reaction of zinc(II) chloride and 2,6-pyri- dine-dicarboxylic acid in mixed solvent of H2O and EtOH with pyridine, and characterized by X-ray analysis and thermal analysis, exhibiting that the coordination geometry of Zn(II) ion is an octa- hedron. Crystal data: ZnC14H16N2O12, Mr = 469.66, monoclinic, P21/n, a = 7.0067(3), b = 23.8215 (12), c = 10.7404(3) ?, β = 99.823(2)°, V = 1766.40(13) ?3, Z = 4, Dc = 1.766 g/cm3, F(000) = 960, μ = 1.463 mm?1, R1 = 0.0462 and wR2 = 0.0884 (I > 2σ(I)). A new complex [Zn (OH2) (HDPA) 2] · 3H2O 1 (H2DPA = 2,6-pyridine-dicarboxylic acid) has been prepared at room temperature from the reaction of zinc (II) chloride and 2,6-pyri- dine-dicarboxylic acid in mixed solvent of H2O and EtOH with pyridine, and characterized by X-ray analysis and thermal analysis, exhibiting that the coordination geometry of Zn (II) ion is an octa-hedron. Crystal data: ZnC14H16N2O12, Mr = 469.66 , β = 99.823 (2) °, V = 1766.40 (13) 3 3, Z = 4, ρ = 1766.40 (13) Dc = 1.766 g / cm3, F (000) = 960, μ = 1.463 mm? 1, R1 = 0.0462 and wR2 = 0.0884 (I> 2σ (I)).