| Summary: | The coordination reaction of the [Dy(hfac)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>] units (hfac<sup>−</sup> = 1,1,1,5,5,5-hexafluoroacetylacetonate) with the [8′-(Diphenoxylphosphinyl)[1,1′-binaphthalen]-8-yl]diphenoxylphosphine oxide ligand (<b>L</b>) followed by a crystallisation in a 1:3 CH<sub>2</sub>Cl<sub>2</sub>:<i>n</i>-hexane solvent mixture led to the isolation of a new polymorph of formula [(Dy(hfac)<sub>3</sub>((<i>S</i>)-L))<sub>3</sub>]<sub>n</sub> (<b>1</b>). The X-ray structure on single crystal of <b>1</b> revealed the formation of a mono-dimensional coordination polymer with three crystallographically independent Dy<sup>III</sup> centres, which crystallised in the polar chiral P2<sub>1</sub> space group. Ac magnetic measurements highlighted single-molecule magnet behaviour under both zero and 1000 Oe applied magnetic field with magnetic relaxation through quantum tunneling of the magnetisation (QTM, zero field only) and Raman processes. Despite the three crystallographically independent Dy<sup>III</sup> centres adopting a distorted D<sub>4d</sub> coordination environment, a single slow magnetic relaxation contribution was observed at a slower rate than its previously studied [(Dy(hfac)<sub>3</sub>((<i>S</i>)-L))]<sub>n</sub> (<b>2</b>) polymorph.
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