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X-Ray crystal structure analysis of the complex [Cu(tpth)(phen)(H- ₂O)]_n, where tpht is the dianion of terephthalic acid and phen is 1,10-phenanthroline, showed that two crystallographically different, but chemically identical tpht ions with monodentately coordinated COO groups exist; both tpht ions act as bridging ligands forming zigzag chains. The Cu(II) ions are in a deformed trigonal bipyramidal environment consisting of two N atoms from phen, two O atoms from different tpht ligands and one O atom from coordinated H₂O molecule. The crystal data are as follows: C ₂₀H₁₄CuN₂O₅, M_r = 425.87, triclinic system, space group P 1, a = 9.007(5), b = 10.557(5), c = 11.554(5) Å, α = 114.343(5), β = 92.942(5), γ = 114.516(5)°, V = 877.3(7) ų, Z = 2, F(000) = 434, ρ_x = 1.612 g cm^-3, μ = 1.281 mm^-1, R₁ = 0.0280 for 4363 reflections with I> 2σ(I), wR₂ = 0.0785 for 5104 independent reflections and 254 refined parameters. Some of data were compared with isostructural Co(II) and Zn(II) complexes having the same ligands.