Matheson BEDais TNDonaldson METakeshi S-ILyu LTakano RIshida TRowlands GJPlieger PG2026-01-072025-11-04Matheson BE, Dais TN, Donaldson ME, Takeshi SI, Lyu L, Takano R, Ishida T, Rowlands GJ, Plieger PG. (2025). Anion Effects on the Structural and Magnetic Properties of a Series of Trinuclear CuII –LnIII –CuII Complexes. ACS Omega. 10. 43. (pp. 50839-50849).https://mro.massey.ac.nz/handle/10179/73992Two series of heterometallic CuII2LnIII complexes, ([Cu2Ln(H4L)2(MeOH)2Br](MeOH)4(Et2O)(Br2), where Ln = Y (1), Gd (2), Er (3), Tb (4)), and ([Cu2Ln(H4L)2(MeOH)2Cl2](MeOH)4(Et2O)Cl, where Ln = Y (5), Gd (6), Er (7), Tb (8), and H6L = (N,N′-bis(2,3,4-trihydroxybenzylidene)-1,2-phenylenediamine), were designed, synthesized, and characterized through X-ray and magnetic analyses. X-ray analysis revealed that the bromide containing complexes 1–4 possessed identical supramolecular arrangements, crystallizing in layers of 2D sheets, while chloride containing complexes 5–8 formed a 3D supramolecular lattice possessing an additional π–π stacking interaction per complex. DC magnetic susceptibility measurements showed that complexes 3 and 7 exhibited antiferromagnetic coupling between copper and erbium centers while the gadolinium (2 and 6) and terbium (4 and 8) containing complexes displayed ferromagnetic Cu─Ln coupling upon cooling. AC magnetic susceptibility measurements revealed that complexes 4 and 8 also displayed zero-field SMM behavior with Ueff = 17.8 and 16.0 K, respectively. The larger bromide anion in complex 4 aids in the isolation of the magnetic centers, resulting in a Ueff value higher than that of the chloride analogue.CC BY-NC-ND 4.0(c) 2025 The Author/shttps://creativecommons.org/licenses/by-nc-nd/4.0/Journal article10.1021/acsomega.5c012242470-1343journal-article50839-50849