A holmium(III) coordination polymer {[Ho(bta)(H₂O)]•1.26H₂O}_n (1), with a three-dimensional channel-like structure, was obtained by assembly of flexible tripodal ligand 1,3,5-benzenetriacetic acid (H₃bta) with Ho(NO₃)₃•6H₂O under hydrothermal conditions. The X-ray single crystal diffraction analysis reveals that the complex is triclinic with space group P-1, a＝0.7621(4) nm, b＝0.9634(4) nm, c＝1.0500(5) nm, α＝106.409(18)°, β＝105.273(18)°, γ＝100.88(2)°, Z＝2, V＝0.6839(6) nm³, D_c＝2.208 g/cm³, μ＝5.824 mm^－1, F(000)＝437, R₁＝0.0224, wR₂＝0.0462. The magnetic property of the solid samples was studied in the temperature range of 1.8～300 K.

Key words: flexible tripodal ligand, holmium(III) complex, crystal structure, magnetic property