Synthesis, Structural Features and Physical Properties of a Family of Triply Bridged Dinuclear 3d-4f Complexes

New dinuclear MII-LnIII complexes of general formulas [Cu(µ-L)(µ-OAc)Ln(NO3)2]·CH3CN·H2O (LnIII = Gd (1), Tb (2), Dy (3) and Er (4)), [Ni(CH3CN)(µ-L)(µ-OAc)Ln(NO3)2]·CH3CN Nd (5), (6), (7), (8), (9) Y (10)) [Co(CH3CN)(µ-L)(µ-OAc)Ln(NO3)2]·CH3CN (11), (12), (13), (14) (15)) were prepared from the compartmental ligand N,N?-dimethyl-N,N?-bis(2-hydroxy-3-formyl-5-bromo-benzyl)ethylenediamine (H2L). In all these complexes, transition metal ions occupy internal N2O2 coordination site ligand, whereas LnIII lie in O4 external site. Both metallic are connected by an acetate bridge, giving rise to triple mixed diphenoxido/acetate bridged MIILnIII compounds. Direct current (dc) magnetic measurements allow study exchange interactions between 3d 4f ions, which is supported density functional theory (DFT) theoretical calculations for GdIII-based counterparts. Due weak ferromagnetic coupling constants obtained both experimentally theoretically, magneto-thermal properties less anisotropic systems (compounds 1 6) also studied. Alternating (ac)magnetic reveal occurrence slight frequency dependency out-of-phase signal 8, 9 13, while complex 15 displays well-defined maximums below ~6 K.