A one-dimensional manganese(II) complex, [Mn(L2)]n (1, HL=4-pyridyl-NH-1,2,3-triazole), has been hydrothermally synthesized at 120°C. In the structure of 1, the Mn(II) ions are octahedral coordinated and further bridged by L− ligands, forming a rigid 1D ribbon coordination chain. Varieties of supramolecular interactions, such as hydrogen bonds and CH⋯π interactions, play an important role on the stabilization of the structures. As revealed by magnetic measurement, complex 1 displays weak antiferromagnetic interaction with θ=–4.83K, the best fit using Fisher's 1D Heisenberg model gives the intrachain magnetic coupling constant J=–0.21cm−1 above 30K due to the neighboring Mn(N–N)2Mn rings twisted in the angle of almost 90°.