A series of trinuclear complexes, [MnII2Y(L)(HL)(NO)][Y(NO)]·7HO (1'), [MnII2Gd(HL)(NO)][MnII2Gd(L)(HL)(NO)][Gd(NO)]·2(-Xy)·12HO (2') and [MnII3(L)(HL)(NO)](NO)·1.25(-Xy) (3'), were synthesized using a β-diketone ligand HL (HL = 1,3-bis(pyridin-2-yl)propane-1,3-dione). X-ray structural analyses revealed that each complex has a trinuclear core with an Mn(II)-M-Mn(II) arrangement (M = Y (1), Gd (2), and Mn (3)). In 1' with a diamagnetic Y(III) ion, negligible antiferromagnetic interactions between terminal Mn(II) ions are operative. On the other hand, 2' shows ferromagnetic interactions between Mn(II) and Gd(III) ions, affording a spin ground state of = 17/2. The homometallic Mn(II) complex of 3' has an = 5/2 spin ground state resulting from the antiferromagnetic interactions between neighboring Mn(II) ions. The maximum magnetic entropy change (-Δ) of 1'-3' was estimated to be 12.3, 24.8, and 8.0 J kg K, respectively.
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