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Hydrothermal synthesis and characterization of two 2-D lanthanide-2,2′-bipyridine-3,3′-dicarboxylate coordination polymers based on zigzag chains

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Title: Hydrothermal synthesis and characterization of two 2-D lanthanide-2,2′-bipyridine-3,3′-dicarboxylate coordination polymers based on zigzag chains
Authors: Hu, Ming hm988@126.com, Li, Hong-Feng1, Yao, Jing-Ya1, Gao, Ya1, Liu, Zhi-Liang1, Su, Hai-Quan
Source: Inorganica Chimica Acta. Jan2010, Vol. 363 Issue 2, p368-374. 7p.
Subjects: Organorare earth metal compounds, Carboxylic acids, Coordination polymers, X-ray diffraction, Complex compounds synthesis, Ligands (Chemistry), Photoluminescence
Abstract: Abstract: Two lanthanide coordination polymers, {[La2(bpdc)3(H2O)4]·(H2O)4} n (1) and {[Sm2(bpdc)3(H2O)2]·(H2O)5} n (2) (H2bpdc=2,2′-bipyridine-3,3′-dicarboxylic acid) have been obtained by hydrothermal synthesis. Single-crystal X-ray diffraction shows that 1 and 2 are two-dimensional network structures based on the zigzag chains which are linked by bpdc ligands, forming the first examples of binary lanthanide polymers with bpdc. It is unprecedented that the adjacent zigzag chains are symmetrical in mirror images with the arraying form of ABAB. In 1 and 2, lanthanide ion are all nine-coordinate and bpdc ligands exhibit different kinds of coordination modes. The 1-D infinite water chain in 1 and pentameric water ring in 2 have been found between lattice water molecules. Thermo-gravimetric analyses of 1 and 2 display considerable thermal stability. Photoluminescent properties of 1 and 2 are discussed. [Copyright &y& Elsevier]
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Abstract:Abstract: Two lanthanide coordination polymers, {[La2(bpdc)3(H2O)4]·(H2O)4} n (1) and {[Sm2(bpdc)3(H2O)2]·(H2O)5} n (2) (H2bpdc=2,2′-bipyridine-3,3′-dicarboxylic acid) have been obtained by hydrothermal synthesis. Single-crystal X-ray diffraction shows that 1 and 2 are two-dimensional network structures based on the zigzag chains which are linked by bpdc ligands, forming the first examples of binary lanthanide polymers with bpdc. It is unprecedented that the adjacent zigzag chains are symmetrical in mirror images with the arraying form of ABAB. In 1 and 2, lanthanide ion are all nine-coordinate and bpdc ligands exhibit different kinds of coordination modes. The 1-D infinite water chain in 1 and pentameric water ring in 2 have been found between lattice water molecules. Thermo-gravimetric analyses of 1 and 2 display considerable thermal stability. Photoluminescent properties of 1 and 2 are discussed. [Copyright &y& Elsevier]
ISSN:00201693
DOI:10.1016/j.ica.2009.11.001