The new complex [Dy(PDOA)(NO₃)(H₂O)₂]_n·nH₂O (1) (H₂PDOA is o-phenylenedioxydiacetic acid) was isolated from the reaction of dysprosium(III) nitrate and H₂PDOA in a 1 : 1 molar ratio. Its crystal structure is formed of neutral zig-zag chains in which the nona-coordinated Dy(III) atoms (O₉ donor set) are linked by PDOA ligands with a chelating-bridging coordination mode. DC and AC magnetic studies revealed that 1 behaves as a field-induced SMM with three relaxation channels. The derived values, considering the Orbach relaxation process, of the barrier to spin reversal and the extrapolated relaxation time are U/k_B = 59.5 K and τ₀ = 6.3 × 10⁻¹⁰ s, respectively. Ab initio calculations support the experimental results.