Two air-stable sulfur-ligated dysprosium(III) complexes [HN(Et) 3 ][Dy 2 NaL 8 ] (1) and [DyNaL 4 (MeOH) x (H 2 O) 2- x ] n (2) based on 2-pyridinethiol 1-oxide (HL) were synthesized and structurally characterized. Discrete 1 and polymeric 2 share the same anionic unit of [DyL 4 ] - with the O 4 S 4 coordination environment, but differ in the precise geometry with triangular dodecahedron geometry in 1 and biaugmented trigonal prism geometry in 2. The subtle change leads to observable temperature-independent relaxation for 2 while a faster relaxation with invisible peak for 1 at zero dc field. Under an optimal dc field, both display the typical Raman process with a smaller pre-factor and higher exponent for 2. Ab initio calculations reveal that the predicted energy barriers are 287 cm -1 for 1 and 303 cm -1 for 2. These results demonstrate the construction and magnetic modulation of air-stable sulfur-ligated Dy-SMM architectures.