Heteronuclear M(II)-Ln(III) (M = Co, Mn; Ln = La, Pr, Sm, Gd, Dy and Er) coordination polymers: Synthesis, structures and magnetic properties |
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| Authors: | Yanmei ChenShixiong She Lina ZhengBin Hu Wenqian ChenBin Xu Zhou ChenFengying Zhou Yahong Li |
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| Institution: | a Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
b Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry and Chemical Engineering, Soochow University, Suzhou 215123, China |
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| Abstract: | Thirteen novel 3d-4f heteronuclear coordination polymers based on the pyridine-2,6-dicarboxylic acid (H2pda) and imidazole ligands, HIm(pda)3MLn(Im)2(H2O)2]·3H2O (Im = imidazole; M = Co, Ln = Pr (1), Gd (2), Dy (3), Er (4); M = Mn, Ln = Pr (5), Sm (6), Gd (7), Dy (8), Er (9)), HIm(pda)3CoSm(Im)2(H2O)2]·2H2O (10), (Im)4M(H2O)2](pda)4La2(H2O)2]·2H2O (M = Co (11), Mn (12)), and (pda)6Co3Pr2(H2O)6]·6H2O (13), have been prepared and structurally characterized. X-ray crystallographic analyses revealed that these complexes display four different types of structures. Complexes 1-9 are isostructural, and possess 1-D chain structures constructed by alternately arrayed nine-coordinated Ln(III) (Ln = Pr, Sm, Gd, Dy, Er) and six-coordinated M(II) (M = Mn, Co) ions. Complex 10 exhibits a unique one-dimensional structure, in which two independent chains are parallel viewed down the a-axis and anti-parallel viewed down the c-axis. Complexes 11 and 12 are isostructural and display 1-D homometallic chain structures. Complex 13 is a 3D framework fabricated through PrN3O6 and CoO6 polyhedrons as building blocks. The variable-temperature solid-state dc magnetic susceptibilities of complexes 2, 3, 4, 9 and 13 have been investigated. Antiferromagnetic exchange interactions were determined for these five complexes. |
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| Keywords: | Pyridine-2 6-dicarboxylic acid Imidazole 3d-4f Heteronuclear Magnetic properties |
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