CEA Grenoble, INAC, SCIB, Laboratoire de Reconnaissance Ionique et Chimie de Coordination, UMR-E 3 CEA-UJF, 38054, Grenoble Cedex 9, France.
Dalton Trans. 2012 Jan 28;41(4):1268-77. doi: 10.1039/c1dt11627d. Epub 2011 Nov 29.
Two tridentate pyridine-tetrazolate ligands (H(2)pytz and H(2)pytzc), analogues of the well-known dipicolinate (H(2)dpa) ligand, have been synthesized in a straightforward manner and used for lanthanide(III) coordination. The structures of the resulting tris-ligand complexes were determined in solution ((1)H-NMR), where they remain undissociated, as well as in the solid state (X-ray diffraction). The solubility of these anionic complexes can be easily tuned by changing the countercation. The bis-tetrazolate-pyridine ligand H(2)pytz sensitizes very efficiently both the visible and near-IR emission of the lanthanides, with unusually high luminescence quantum yields in solid state (61% and 65% for Eu and Tb, respectively, and 0.21% for Nd) and in water (63% for Tb and 18% for Eu). Furthermore, the absorption window of the complexes is significantly extended towards the visible region up to 330 nm. The results show that the bis-tetrazolate-pyridine ligand provides a very attractive alternative to the classic dipicolinate ligand.
两种三齿吡啶-四唑配体（H2pytz 和 H2pytzc），类似于著名的二吡啶甲酸（H2dpa）配体，被以简单的方式合成并用于镧系元素（III）配位。所得三配体配合物的结构在溶液中（1H-NMR）中确定，其中它们保持不解离，在固态（X 射线衍射）中也是如此。通过改变抗衡阳离子，可以轻松调节这些阴离子配合物的溶解度。双四唑-吡啶配体 H2pytz 非常有效地敏化镧系元素的可见和近红外发射，在固态（Eu 和 Tb 分别为 61%和 65%，Nd 为 0.21%）和水中（Tb 为 63%，Eu 为 18%）具有异常高的荧光量子产率。此外，配合物的吸收窗口显著扩展到可见光区域，直至 330nm。结果表明，双四唑-吡啶配体为经典二吡啶甲酸配体提供了一个非常有吸引力的替代方案。
