Di- and tetranuclear heterometallic CuⅡ-LnⅢ complexes （Ln = Gd and Dy）： Synthesis, structure and magnetic properties

Four 3d-4f heterometallic complexes, [CuⅡ-LnⅢ（bpt）2（NO3）3（MeOH）] （Ln = Gd, 1; Dy, 2; bptH = 3,5-bis（pyrid-2-yl）-l,2,4- triazole）, [CuⅡ-LnⅢ（μ-OH）2（bpt）4C14 （H2O）2]·6H2O （Ln = Gd, 3; Dy, 4）, have been synthesized under solvothermal condi- tions. X-ray structural analyses reveal that 1 and 2 are isostr...

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Published in中国科学：化学英文版 Vol. 55; no. 6; pp. 934 - 941
Main Author ZHANG ZeMin GUO FuSheng GUO PengHu LIU JunLiang NI ZhaoPing TONG MingLiang
Format Journal Article
LanguageEnglish
Published 2012
Subjects
反铁磁相互作用
合成
四核
复合物
磁性
结构分析
铜
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Summary:Four 3d-4f heterometallic complexes, [CuⅡ-LnⅢ（bpt）2（NO3）3（MeOH）] （Ln = Gd, 1; Dy, 2; bptH = 3,5-bis（pyrid-2-yl）-l,2,4- triazole）, [CuⅡ-LnⅢ（μ-OH）2（bpt）4C14 （H2O）2]·6H2O （Ln = Gd, 3; Dy, 4）, have been synthesized under solvothermal condi- tions. 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 intramolecu- lar 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 {cunzLnm2} 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 CulI-Lnm interactions occur in 1 （Jcu = -0,21 cm-1） and 2. The antiferromagnetic interaction occurs in complex 3 with JcuGa = -0.82 cm-1 and JcdGd = --0.065 cm-1, while domi- nant ferromagnetic interaction occurs in complex 4.
Bibliography:heterometallic complexes, copper, lanthanides, triazolate, X-ray crystallography, magnetic properties
Four 3d-4f heterometallic complexes, [CuⅡ-LnⅢ（bpt）2（NO3）3（MeOH）] （Ln = Gd, 1; Dy, 2; bptH = 3,5-bis（pyrid-2-yl）-l,2,4- triazole）, [CuⅡ-LnⅢ（μ-OH）2（bpt）4C14 （H2O）2]·6H2O （Ln = Gd, 3; Dy, 4）, have been synthesized under solvothermal condi- tions. 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 intramolecu- lar 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 {cunzLnm2} 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 CulI-Lnm interactions occur in 1 （Jcu = -0,21 cm-1） and 2. The antiferromagnetic interaction occurs in complex 3 with JcuGa = -0.82 cm-1 and JcdGd = --0.065 cm-1, while domi- nant ferromagnetic interaction occurs in complex 4.
11-5839/O6
ISSN:1674-7291
1869-1870