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Excimer Formation in a Terbium Metal–Organic Framework Assists Luminescence Thermometry
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-10-31 00:00:00 , DOI: 10.1021/acs.chemmater.7b03817
Duarte Ananias 1 , Ana D. G. Firmino 1 , Ricardo F. Mendes 1 , Filipe A. Almeida Paz 1 , Mariela Nolasco 1 , Luís D. Carlos 1 , João Rocha 1
Affiliation  

Photoluminescent isotypical phosphonate-based metal–organic frameworks, [Ln(H5btp)]·2H2O [where Ln3+ = Tb3+ (1) or Gd3+ (2) and H8btp = [1,1′-biphenyl]-3,3′,5,5′-tetrayltetrakis(phosphonic acid)] prepared under solvo(hydro)thermal conditions exhibit a three-dimensional supramolecular structure built up from phosphonate linkers bridging Ln3+ ions. Single-crystal X-ray diffraction of 1 revealed hydrogen bonds along the a-axis between the crystallization water molecules and the phosphonate groups. The network features lozenge-shaped tubular channels with intermolecular interactions between adjacent organic ligand molecules. Crystal packing forces bring together two ligand biphenyl groups in a parallel arrangement, forming an excimer. A ratiometric luminescent thermometer operative close to room temperature was built based on the excimer and the 5D47F5 Tb3+ emissions, exhibiting a maximum relative thermal sensitivity of 1.26%·K–1 and a minimum temperature uncertainty of 0.75 K at 319 K. This performance is similar to that of a thermometer based on the ligand singlet S2,1S0 and metal 5D47F5 transitions. Thus, the same MOF material provides two separate temperature data sets. This work shows the possibility of using excimer emissions in ratiometric luminescence thermometry.

中文翻译:

a金属-有机骨架中的准分子形成有助于发光测温。

基于光致发光的典型的基于膦酸酯的金属-有机骨架,[Ln(H 5 btp)]·2H 2 O [其中Ln 3+ = Tb 3+1)或Gd 3+2)和H 8 btp = [1,1在溶剂热(水)热条件下制备的'-联苯基] -3,3',5,5'-四基四(膦酸)]显示出由桥接Ln 3+离子的膦酸酯连接基构建的三维超分子结构。的单晶X射线衍射1揭示氢键沿着一个结晶水分子和膦酸酯基之间的长轴。该网络具有菱形管状通道,在相邻的有机配体分子之间具有分子间的相互作用。晶体堆积力将两个配体联苯基以平行排列的方式聚集在一起,形成一个准分子。根据准分子和5 D 47 F 5 Tb 3+排放量,建立了一个接近室温的比例发光温度计,其最大相对热敏度为1.26%·K –1,最小温度不确定度为0.75 K在319 K时的性能。该性能类似于基于配体单重态S 2,1的温度计的性能。S 0和金属5 D 47 F 5过渡。因此,相同的MOF材料提供两个单独的温度数据集。这项工作表明在比例发光发光测温法中使用准分子发射的可能性。
更新日期:2017-10-31
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