Comparison to the SIP (12.8 cm 3 K mol -1 ) and CIP (13.1 cm 3 K mol -1 ) values (see ESI, Figure ) reveals 4-Dy as an outlier that is closer to the Dy(III) free ion value of ( 6 H15/2, χT = 14.17 cm 3 K mol -1 ). The χT values of all the complexes decrease slowly with temperature as the excited crystal field states are thermally depopulated. There is a marked decrease at Dy are all close to 5.00 NμB, which is the calculated value for a pure mJ = ±15/2 ground state. The hysteresis loops remained open (TH) to 22 K for 2-Dy, 24 K for 3-Dy and 24 K for 4-Dy (Table and ESI Figures S71-S76); for 5-Dy the loop is butterfly-shaped and closed around zero field even at 1.8 K. The steps observed at zero field are characteristic of QTM and are much sharper than the equivalent features observed for the SIP and CIP complexes. At 2 K, the remanent magnetization of 2-Dy and 3-Dy are similar (79% and 73%; Figure ), but lower for 4-Dy (61%); these values are all higher than the SIP (44%) and CIP (43%). Additionally, the coercive field of the solvent adducts are increased at 1.8 K (2-Dy: 0.918 T;