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Four 3d-4f heterometallic complexes, [Cu~ⅡLn~Ⅲ(bpt)2(NO3)3(MeOH)] (Ln = Gd, 1; Dy, 2; bptH = 3,5- bis(pyrid-2-yl)-1,2,4- triazole), [Cu~Ⅱ2Ln~Ⅲ2(μ-OH)2(bpt)4Cl4 (H2O)2]·6H2O (Ln = Gd, 3; Dy, 4), have been synthesized under solvothermal conditions. X-ray structural analyses reveal that 1 and 2 are isostructural while 3 and 4 are isostructural. In each complex, the copper and gadolinium or dysprosium ions are linked by two triazolate bridges and form a Cu~Ⅱ-Ln~Ⅲ dinuclear unit. The intramolecular Cu-Ln distances are 4.542, 4.525, 4.545 and 4.538 for 1, 2, 3 and 4, respectively. Two dinuclear CuLn units are bridged by two OH- groups into the zig-zag tetranuclear {Cu~Ⅱ2Ln~Ⅲ2} structures with the Ln(Ⅲ)…Ln(Ⅲ) distances of 3.742 and 3.684 for 3 and 4, respectively. Magnetic studies show that the antiferromagnetic Cu~Ⅱ-Ln~Ⅲ interactions occur in 1 (JCuGd = -0.21 cm-1) and 2. The antiferromagnetic interaction occurs in complex 3 with JCuGd = -0.82 cm-1 and JGdGd = -0.065 cm-1, while dominant ferromagnetic interaction occurs in complex 4.
Four 3d-4f heterometallic complexes [Cu ~ IILn ~ III (bpt) 2 (NO3) 3 (MeOH)] (Ln = Gd, 1; Dy, 2; bptH = -1,2,4-triazole, and [Cu ~ Ⅱ2Ln ~ Ⅲ2 (μ-OH) 2 (bpt) 4Cl4 (H2O) 2] · 6H2O (Ln = Gd, 3; Dy, 4) have been synthesized under solvothermal conditions. X-ray structural analyzes reveal that 1 and 2 are isostructural while 3 and 4 are isostructural. In each complex, the copper and gadolinium or dysprosium ions are linked by two triazolate bridges and form a Cu ~ II-Ln ~ III dinuclear unit . The intramolecular Cu-Ln distances are 4.542, 4.525, 4.545 and 4.538 for 1, 2, 3 and 4, respectively. Two dinuclear CuLn units are bridged by two OH- groups into the zig-zag tetranuclear {Cu ~ Ⅱ 2Ln ~ Ⅲ 2 } structures with the Ln (Ⅲ) ... Ln (Ⅲ) distances of 3.742 and 3.684 for 3 and 4, respectively. Magnetic studies show that the antiferromagnetic Cu ~ Ⅱ-Ln ~ Ⅲ interactions occur in 1 (JCuGd = -0.21 cm- 1) and 2. The antiferromagnetic interaction occurs in complex 3 with JCuGd = -0.82 cm-1 and JGd Gd = -0.065 cm-1, while dominant ferromagnetic interaction occurs in complex 4.