A new 1D copper(II) polymer [Cu(Hpt)(3,5-DMBA)]_n has been hydrothermally synthesized with copper acetate, 3-(pyridin-2-yl)-1,2,4-triazole(Hpt) and 3,5-dimethylbenzoic acid (3,5-DMBA). It crystallizes in triclinic space group P1, with a = 8.1974(6), b = 8.3280(6), c = 12.5021(9) A, α = 84.3320(10), β = 71.8870(10), γ= 65.4560(10)o, V = 737.44(9) A~3, D_c = 1.612 g/cm~3, Z = 2, F(000) = 366, GOOF = 1.035, R = 0.0298 and wR = 0.0855. The crystal structure is a one-dimensional (1-D) chain in which the Cu(II) is five-coordinated with square pyra...