Two 3D Coordination Frameworks Based on Nanosized Huge Ln26 (Ln = Dy and Gd) Spherical Clusters

作者：Lian Huang, Lijie Han, Wenjun Feng, Lei Zheng, Zhibin Zhang, Yan Xu, Qi Chen, Dunru Zhu, Shu‐Yun Niu · 发表于：Crystal Growth & Design · 年份：2010 · DOI：10.1021/cg9014064 · 被引用次数：44 · 研究领域：Magnetism in coordination complexes、Metal-Organic Frameworks: Synthesis and Applications、Lanthanide and Transition Metal Complexes

Two novel three-dimensional (3D) coordination polymers Zn 1.5 Dy 26 (IN) 25 (CH 3 COO) 8 (CO 3 ) 11 (OH) 26 (H 2 O) 29 ( 1 ) and Zn 1.5 Gd 26 (IN) 26 (CH 3 COO) 7 (CO 3 ) 11 (OH) 26 (H 2 O) 28 ( 2 ) based on the linkages of large nanosized spherical hydroxo Ln 26 clusters and zinc centers by organic ligands have been hydrothermally synthesized. Metal organic framework (MOF) 1 crystallizes in the triclinic space group P 1̅, with a = 21.107(2) Å, b = 21.185(2) Å, c = 36.323(4) Å, α = 89.001(2)°, β = 82.486(2)°, γ = 68.359(2)°, V = 14960(3) Å 3, Z = 2. MOF 2 crystallizes in the triclinic space group P 1̅, a = 19.6213(15) Å, b = 22.1850(17) Å, c = 34.654(3) Å, α = 88.5340(210)°, β = 85.6520(10)°, γ = 72.9790(19)° V = 14382.5(19) Å 3, Z = 2. Structural analysis indicates that both 3D polymers can be constructed using the building unit of CO 3 @Ln 26 (Dy for 1, Gd for 2 ) and exhibit similar topological frameworks. During the synthesis, three ligands were used. CO 3 2− plays a very important role in the formation of the spherical Ln 26 cluster. CH 3 COO − makes the Ln 26 cluster stable and reduces steric restriction. The isonicotinate (IN) stabilizes the cluster and links the clusters and the Zn centers.