Hydrothermal Syntheses,Crystal Structures and Properties of Two Novel 3‐D Lanthanide(III) Coordination Polymers Constructed with Mixed Heterocyclic Carboxylic Acid |
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| Authors: | Chengzhi Xie Baofeng Zhang Xiaoqing Wang Associate Prof Bin Yu Ruji Wang Guangqiu Shen |
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| Institution: | 1. Beijing/P.R. China, Department of Chemistry, Tsinghua University;2. Luoyang, Henan /P.R. China, Department of Chemistry, Luoyang Normal University |
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| Abstract: | The hydrothermal reactions of Ln2O3 (Ln = Nd and Eu) with pyridine‐2,5‐dicarboxylic acid (H2pydc) resulted in the formation of two isomorphic three‐dimensional (3D) polymeric LnIII complexes, Ln(pydc)(nic)·H2O]n (Ln = Nd( 1 ) and Eu( 2 )), in which nic (nicotinate; also named as pyridine‐2‐carboxylic acid) might have been formed from the pydc ligands through the C–C bond cleavage and CO2 molecules releasing. Pydc ligands bridge lanthanide centers to form the three‐dimensional framework featuring hexagonal channels along the axis a which are occupied by bridging nic anions and mono‐coordinated water molecules. From the topological point of view, two three‐dimensional nets are binodal with six‐ and three‐connected nodes, which display a distorted rutile (4.62)2(42·610·83) topology. Magnetic measurements (2‐300 K) reveal that all polymers possess weak antiferromagnetic property. A strong fluorescence emission spectrum of compound 2 was observed. |
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| Keywords: | Lanthanidecomplexes 3‐D structure Pyridine‐2 5‐dicarboxylic acid Decarboxylation Magnetism Fluorescence |
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