Di- and tetranuclear heterometallic CuII-LnIII complexes (Ln = Gd and Dy): Synthesis, structure and magnetic properties |
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| Authors: | ZeMin Zhang FuSheng Guo PengHu Guo JunLiang Liu ZhaoPing Ni MingLiang Tong |
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| Institution: | 1. Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education; State Key Laboratory of Optoelectronic Materials and Technologies; School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, China
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| Abstract: | Four 3d?C4f heterometallic complexes, CuIILnIII(bpt)2(NO3)3(MeOH)] (Ln = Gd, 1; Dy, 2; bptH = 3,5-bis(pyrid-2-yl)-1,2,4- triazole), CuII 2LnIII 2(??-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 CuII-LnIII 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 {CuII 2LnIII 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 CuII-LnIII interactions occur in 1 (J CuGd = ?0.21 cm?1) and 2. The antiferromagnetic interaction occurs in complex 3 with J CuGd = ?0.82 cm?1 and J GdGd = ?0.065 cm?1, while dominant ferromagnetic interaction occurs in complex 4. |
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| Keywords: | heterometallic complexes copper lanthanides triazolate X-ray crystallography magnetic properties |
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