Solid state and solution dynamics of pyridine based tetraaza-macrocyclic lanthanide chelates possessing phosphonate ligating functionality (Ln-PCTMB): effect on relaxometry and optical properties.

Solid state and solution dynamics of pyridine based tetraaza-macrocyclic lanthanide chelates possessing phosphonate ligating functionality (Ln-PCTMB): effect on relaxometry and optical properties.
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吡啶基的固态和溶液动力学具有膦酸酯绑扎功能(LN-PCTMB)的大环螯合物(LN-PCTMB):对弛豫和光学特性的影响。

DOI:
10.1021/ic901779k
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发表时间:
2009-12-21
影响因子:
4.6
通讯作者:
Woods, Mark
Woods, Mark
中科院分区:
化学2区
文献类型:
--
作者:
Kiefer, Garry E.;Woods, Mark

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合成了大环配体 3,6,9-三(亚甲基丁基膦酸)-3,6,9-15-四氮杂双环[9.3.1]十五-1(15),11,13-三烯 (PCTMB),并通过 X 射线晶体学、发光和光谱研究了 Eu3+、Tb3+ 和 Gd3+ 的配合物。 松弛测量法。在晶体中,这些复合物是二聚体,并具有通过桥联膦酸酯连接的 8 配位 Ln3+ 中心。吡啶核引入的刚性迫使 EuPCTMB 和 TbPCTMB 采用扭曲的短轴蝶形 (TSD) 配位几何结构。对固态EuPCTMB 5D0 → 7F0 发光跃迁的检查证实了单个不同的Eu3+ 配位环境的存在,而在水溶液中观察到了两个Eu3+ 配位环境。 TbPCTMB 水溶液的寿命分析确定,两种配位环境的 q = 0.1 和 q = 1.0 以及 Stern-Volmer 猝灭常数(KSVτ = 1101 M−1,KSVΦ = 40780 M−1)支持单体/二聚体平衡的存在。 GdPCTMB 在 H2O/CH3OH 中的弛豫性研究表现出浓度依赖性(0.02 mM –10.00 mM),范围从 r1 = 7.0 mM−1s−1 到 4.0 mM−1s−1 ,与发光观察到的趋势一致。
The macrocyclic ligand 3,6,9-tris(methylenebutyl phosphonic acid)-3,6,9-15-tetraazabicyclo [9.3.1]pentadeca-1(15),11,13-triene (PCTMB) was synthesized and complexes of Eu3+, Tb3+, and Gd3+ studied by X-ray crystallography, luminescence, and relaxometry. In the crystal these complexes are dimeric and possess 8-coordinate Ln3+ centers that are linked by bridging phosphonates. The rigidity introduced by the pyridyl nucleus forces the EuPCTMB and TbPCTMB to adopt a twisted snub disphenoid (TSD) coordination geometry. Examination of the 5D0 → 7F0 luminescent transition of EuPCTMB in the solid state confirmed the existence of a single distinct Eu3+ coordination environment, whereas two Eu3+ coordination environments were observed in aqueous solution. Lifetime analysis of aqueous TbPCTMB solutions determined that q = 0.1 and q = 1.0 for the two coordination environments and Stern-Volmer quenching constants (KSVτ = 1101 M−1, KSVΦ = 40780 M−1) support the presence of a monomer/dimer equilibrium. Relaxivity studies of GdPCTMB in H2O/CH3OH exhibited a concentration dependency (0.02 mM –10.00 mM) ranging from r1 = 7.0 mM−1s−1 to 4.0 mM−1s−1 consistent with the trend observed by luminescence.
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