Three new Cu(Ⅱ)-Ln(Ⅲ) heterometallic coordination polymers constructed from quinolinic acid and nicotinic acid: Synthesis, structures, and magnetic properties  

作　　者：LIU SuiJun SONG WeiChao XUE Li HAN SongDe ZENG YongFei WANG LiFu BU XianHe 

机构地区：[1]Department of Chemistry, Tianjin Key Laboratory of Metal & Molecule-based Material Chemistry, Nankai University, Tianjin 300071, China

出　　处：《Science China Chemistry》2012年第6期1064-1072,共9页中国科学（化学英文版）

基　　金：financially supported by the National Natural Science Foundation of China (21031002, 51073079, 20801029)

摘　　要：Three new Cu（Ⅱ）-Ln（Ⅲ） heterometallic coordination polymers based on two N-heterocyclic carboxylic ligands, {[LnCu（LI）2（L2）（H2O）2]· mH20},, （Ln = La（1）, Nd（2）, Gd（3）, m = 2 （for 1）, 1 （for 2, 3）, H2L1 = quinolinic acid, HE2 = nico- tinic acid）, have been synthesized and characterized. 1 has a two-dimensional （2D） layer structure with a Schlifli symbol of （44.62）, while complexes 2 and 3 are isostructural and have three-dimensional （3D） structures with a Schlafli symbol of （3.4.5）2（32.42.52.6]4.74.83.9）（32.63.7） of 3-nodal net. Magnetic investigations suggest that antiferromagnetic coupling exists be- tween NdIn and Cun in 2, while weak ferromagnetic coupling between GdⅢ and CuⅡ in 3. The difference of magnetic properties between 2 and 3 has been discussed.Three new Cu(Ⅱ)-Ln(Ⅲ) heterometallic coordination polymers based on two N-heterocyclic carboxylic ligands, {[LnCu(L1)2(L2)(H2O)2]·mH2O}n (Ln = La(1), Nd(2), Gd(3), m = 2 (for 1), 1 (for 2, 3), H2L1 = quinolinic acid, HL2 = nicotinic acid), have been synthesized and characterized. 1 has a two-dimensional (2D) layer structure with a Schlfli symbol of (44.62), while complexes 2 and 3 are isostructural and have three-dimensional (3D) structures with a Schlfli symbol of (3.4.5)2(32.42.52.614.74.83.9)(32.63.7) of 3-nodal net. Magnetic investigations suggest that antiferromagnetic coupling exists between NdIII and CuII in 2, while weak ferromagnetic coupling between GdIII and CuII in 3. The difference of magnetic properties between 2 and 3 has been discussed.

关 键 词：Cu（Ⅱ）-Ln（Ⅲ） coordination polymers metal oxides magnetic properties 

分 类 号：O614.121[理学—无机化学] O482.5[理学—化学]