Syntheses, structures, and luminescent and magnetic properties of novel three-dimensional lanthanide complexes with 1,3,5-benzenetriacetate.
Syntheses, structures, and luminescent and magnetic properties of novel three-dimensional lanthanide complexes with 1,3,5-benzenetriacetate.
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DOI：
10.1021/ic050453a
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发表时间：
2005-08
影响因子：
4.6
通讯作者：
Zheng-Hua Zhang;T. Okamura;Y. Hasegawa;H. Kawaguchi;Ling-yan Kong;Wei‐Yin Sun;N. Ueyama
中科院分区：
文献类型：
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作者：
Zheng-Hua Zhang;T. Okamura;Y. Hasegawa;H. Kawaguchi;Ling-yan Kong;Wei‐Yin Sun;N. Ueyama
合成了五种新的镧系配合物，其化学式为[Nd（bta）（H2O）2.4.35H2O]n（1）、[Sm（bta）（H2O）2.4.5H2O]n（2）、[Eu（bta）（H2O）.1.48H2O]n（3）、[Tb（bta）（H2O）.1.31H2O]n（4）和[Yb（bta）（H2O）.H2O]n（5）。（H3 bta = 1，3，5-苯三乙酸）的合成。X射线衍射分析结果表明，配合物均具有三维孔道结构，其中bta 3配体采用不同的配位模式：1、2和5分别为单齿和mu 2-eta 2：eta 1-桥联配位模式，3和4分别为mu 2-eta 1：eta 1-桥联和mu 2-eta 2：eta 1-桥联配位模式.配合物1和2以及3和4分别是同构的，其中所有的Ln（III）（Ln = Nd，Sm，Eu和Tb）原子是九配位的，而配合物5中的Yb（III）原子是八配位的。两个配合物3和4在激发时显示出很强的发光，并且它们的发光衰减曲线与单指数衰减很好地拟合，其中3的寿命为0.45 ms，4的寿命为1.0 ms。在1.8-300 K温度范围内研究了配合物的磁性。
Five novel lanthanide complexes with the formulas [Nd(bta)(H2O)2.4.35H2O]n(1), [Sm(bta)(H2O)2.4.5H2O]n (2), [Eu(bta)(H2O).1.48H2O]n (3), [Tb(bta)(H2O).1.31H2O]n (4), and [Yb(bta)(H2O).H2O]n (5) (H3bta = 1,3,5-benzenetriacetic acid) have been prepared by using the corresponding lanthanide salt and H3bta. The results of an X-ray crystallographic analysis revealed that all the complexes have three-dimensional channel-like structures, in which the bta3- ligands adopt different coordination modes: monodentate and mu2-eta2:eta1-bridging coordination modes in 1, 2, and 5 and mu2-eta1:eta1-bridging and mu2-eta2:eta1-bridging coordination modes in 3 and 4, respectively. Complexes 1 and 2, as well as 3 and 4, are isostructural, respectively, in which all the Ln(III) (Ln = Nd, Sm, Eu, and Tb) atoms are nine-coordinated, while the Yb(III) atoms in complex 5 are eight-coordinated. Both complexes 3 and 4 showed strong luminescence upon excitation, and their luminescence decay curves fit well with single exponential decays of which the lifetime is 0.45 ms for 3 and 1.0 ms for 4. The magnetic properties of the complexes were investigated in the temperature range of 1.8-300 K.