Crystal Structures, Magnetic Behavior and Framework Stability of Lanthanide-Based Coordination Polymers

• Main Authors: Hsiao-chen Liu, 劉曉嬋
• Other Authors: Kuei-fang Hsu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/96289450172093917218

碩士 === 國立成功大學 === 化學系碩博士班 === 95 === Five new lanthanide coordination polymers have been prepared under the mild solvothermal conditions. In [Nd2(H2O)4(C2O4)(C4H4O4)2]•4H2O (1), the succinates are assembled with the Nd3+ ions to form layers, which layers are then pillared by the oxalates yielding a porous framework, possessing open channels along the multiple-directions. The dehydrated phase of “Nd2(C2O4)(C4H4O4)2” sill sustains and which framework presents flexibility upon the reversible adsorption of water molecules. In [Na2(H2O)2Nd2(C2O4)3(C4H4O4)]•2H2O (2), the formation of honeycomb-like layer is facilitated by two in-plane oxalates where the presence of dimeric neodymium units are bridged through the succinates. The third out-of-plane oxalate pillars the layer into a new open framework. The other three compounds adopt the general chemical stoichiometry of NH4[Ln(H2O)(C2O4)(SO4)] (Ln = Nd for 3, Eu for 4 and Gd for 5), which all crystallize in three-dimensional frameworks. The SO42- ligands apply the various connective fashions of μ3：η2：η1：η1 for 3, μ3：η1：η1：η1 for 4 and 5, and μ3：η2：η1：η1 for the Ce analogue prepared in the previous work and direct the various architectures formed in these frameworks.