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首页> 外文期刊>Chemistry: A European journal >Pillaring of CdCl2-like layers in lanthanide metal-organic frameworks: Synthesis, structure, and photophysical properties
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Pillaring of CdCl2-like layers in lanthanide metal-organic frameworks: Synthesis, structure, and photophysical properties

机译：镧系金属-有机骨架中类似CdCl2的层的成柱：合成，结构和光物理性质

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摘要

A hydrothermal reaction of lanthanide salts, pyridine-2,3-dicarboxylic acid, benzene-1,4-dicarboxylic acid, and water gave rise to a new series of three-dimensional mixed carboxylates (homocyclic and heterocyclic) of lanthanides with the general formula [M-2(H2O)(4)][{C5H3N(COO)(2)}(2){C6H4-(COO)(2)}] M=La (I), Pr (II), and Nd (III). The structure consists of M2O14N2 dimeric units connected by pyridine-2,3-dicarboxylate moieties to form two-dimensional layers that are pillared by terephthalate units. ne structures also possess two coordinated water molecules, which are arranged to form one-dimensional helical chains and can be reversibly adsorbed. The connectivity within the layers closely resembles that of the CdCl2 layered structure with 3(6) topology. To the best of our knowledge, this is the first observation of CdCl2 topology in lanthanide metal-organic framework compounds. Partial substitution of La3+ in I by Eu3+ and Tb3+ (2 and 4%) gives rise to characteristic red/pink or green emission, which suggests a ligand-sensitized metal-centered emission. The Nd compound III shows interesting UV and blue emission through an up-conversion process.
机译：镧系元素盐，吡啶-2,3-二羧酸，苯-1,4-二羧酸和水的水热反应产生了一系列具有通式的镧系元素的三维混合羧酸盐（均杂环和杂环） [M-2（H2O）（4）] [{C5H3N（COO）（2）}（2）{C6H4-（COO）（2）}] M = La（I），Pr（II）和Nd（ III）。该结构由通过2,3-二羧酸吡啶部分连接的M2O14N2二聚单元组成，形成以对苯二甲酸酯单元为支柱的二维层。新结构还具有两个配位的水分子，它们排列形成一维螺旋链，并且可以可逆地吸附。层内的连通性与具有3（6）拓扑结构的CdCl2分层结构的连通性非常相似。据我们所知，这是镧系元素金属-有机骨架化合物中CdCl2拓扑结构的首次观察。 I中的La3 +被Eu3 +和Tb3 +（2％和4％）部分取代会产生特征性的红色/粉色或绿色发射，这表明配体敏化了以金属为中心的发射。 Nd化合物III通过上转换过程显示出有趣的UV和蓝光发射。

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