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首页> 外文期刊>Crystal growth & design >Introducing a second ligand: New route to luminescent lanthanide polyphosphonates
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Introducing a second ligand: New route to luminescent lanthanide polyphosphonates

机译：引入第二种配体：发光镧系元素多膦酸盐的新途径

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摘要

By introduction of oxalate as the second ligand, three novel luminescent lanthanide tetraphosphonates with two types of structures, namely, [La-2(ox)(2)(H6L)]center dot 2H(2)O (1, H8L = (H2O3PCH2)(2)NCH2CH2CH2CH2N(CH2PO3H2)(2)) and Ln(2)(ox)(2)(H6L)-(H2O)(2)center dot 4H(2)O(Ln = Nd, 2; Eu, 3), have been prepared and structurally characterized. The interconnection of La(III) ions in 1 by bridging H6L anions resulted in a 3D network with tunnels running along the a-axis, the oxalate anions are located inside the above tunnels, and each forms two five-membered chelating rings with two La(Ill) ions. All four phosphonate groups of the H6L anion are bidentate and singly protonated; its two amine groups are also protonated. Compounds 2 and 3 are isostructural, and their structures feature a pillared layered structure. The layer is formed by Ln(III) ions interconnected by oxalate and -NH(CH2PO3H)(2) moieties of H6L anions, and the organic groups of the tetraphosphonate ligand act as the pillars. Alternatively, their structures can be described as the lanthanide tetraphosphonate layers being cross-linked by oxalate anions (pillars). The H6L anions in 2 and 3 are hexadentate, and each bridges with six Ln(III) ions; two phosphonate groups are bidentate, and the other two are unidentate. Compounds 1, 2, and 3 exhibit strong emission bands in the blue, red light, and near-IR region, respectively.
机译：通过引入草酸盐作为第二个配体，三种新型发光镧系四膦酸盐具有两种类型的结构，即[La-2（ox）（2）（H6L）]中心点2H（2）O（1，H8L =（H2O3PCH2 ）（2）NCH2CH2CH2CH2N（CH2PO3H2）（2））和Ln（2）（ox）（2）（H6L）-（H2O）（2）中心点4H（2）O（Ln = Nd，2; Eu，3 ），已经准备好并进行了结构表征。通过桥连H6L阴离子使La（III）离子相互连接，形成3D网络，其隧道沿a轴延伸，草酸根阴离子位于上述隧道内，并且各自形成两个带有两个La的五元螯合环（不适）离子。 H6L阴离子的所有四个膦酸酯基团都是双齿的并且单独质子化;它的两个胺基也被质子化。化合物2和3是同构的，其结构具有柱状分层结构。该层由草酸根与H6L阴离子的-NH（CH2PO3H）（2）部分互连的Ln（III）离子形成，四膦酸酯配体的有机基团充当支柱。可替代地，它们的结构可以描述为被草酸根阴离子（柱）交联的镧系四膦酸酯层。 2和3中的H6L阴离子为六齿，每个桥与六个Ln（III）离子相连;两个膦酸酯基是双齿的，另外两个是不相同的。化合物1、2和3在蓝色，红色光和近红外区域分别显示出很强的发射带。

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