Structure Variation from One-Dimensional Chain to Three-Dimensional Architecture: Effect of Ligand on Construction of Lanthanide Coordination Polymers

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• 作者：LEI WANG ; WEN-XUAN LI ; XIAO-MIN GU ; WEN-LI ZHANG ; LIANG NI
• 关键词：Lanthanides ; hydrothermal synthesis ; crystal structure ; cyanosilylation.
• 刊名：Journal of Chemical Sciences
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：129
• 期：2
• 页码：271-280
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry/Food Science, general;
• 出版者：Springer India
• ISSN：0973-7103
• 卷排序：129

文摘

Four lanthanide coordination polymers were constructed from mixed ligands of phenanthroline derivative and flexible polydentate ligands, [Gd₂(1,3-BDC)₃(MOPIP)₂]_n⋅nH₂O (1), [Gd(1,4-BDC)_1.5(MOPIP)]_n (2), [Yb(1,4-BDC)_1.5(MOPIP)]_n (3) and [Sm(1,4-BDC)_1.5(MOPIP)]_n (4), (MOPIP = 2-(4-methoxyphenyl)-1H-imidazo[4,5-f][1,10]phenanthroline, 1,3-BDC = benzene-1,3- dicarboxylic acid, 1,4-BDC = benzene-1,4-dicarboxylic acid). The polymers have been synthesized under hydrothermal conditions and structurally characterized by single crystal X-ray diffraction analysis. Compound 1 possesses one-dimensional chain structure, and expands into the three-dimensional supramolecular architecture by π⋯π stacking and hydrogen-bonding interactions. Meanwhile, compounds 2–4 exhibit three-dimensional frameworks with pcu topology (4 12⋅6 3). The structural differences among such compounds show that the steric hindrances of benzene dicarboxylic acid ligands play a key role in the assembly and the structures of the title compounds. Compounds 1 and 2 act as efficient Lewis acid catalysts for the cyanosilylation of benzaldehyde in high yields, due to the strong Lewis acidity.