Key Laboratory for Organic Electronics and Information Displays (KLOEID) and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications (NUPT), Nanjing, 210023, PR China.
Dalton Trans. 2013 Sep 14;42(34):12403-9. doi: 10.1039/c3dt51081f. Epub 2013 Jul 17.
A metal-organic framework (MOF) {[Eu2(MFDA)2(HCOO)2(H2O)6]·H2O}n (1) (H2MFDA = 9,9-dimethylfluorene-2,7-dicarboxylic acid) has been solvothermally synthesized and structurally characterized. 1 possesses the three-dimensional pcu type rod-packing structure with one-dimensional rhombic channels. The framework of 1 can reversibly shrink/swell along the c axis upon partial/full release of the water molecules. Correspondingly, the rhombic channels become narrow/large and 1 transforms to narrow-pore 1a/large-pore 1b. 1, 1a and 1b have almost the same excitation and emission spectra with the strong characteristic red-light-emission of Eu(III). A high photoluminescence quantum yield of 77% and long luminescence lifetime of around 1.1 ms was observed for 1. The potential of 1b for Fe(3+) ions and PA sensing was studied in DMF through the luminescence quenching experiments, which show 1b is a potential turn-off luminescent sensory material for the selective detection of Fe(3+) ions and PA with detection limits of around 10(-7) M for both of them. The fluorescence quenching mechanism for Fe(3+) ions and PA was also investigated.
一种金属有机骨架（MOF）{[Eu2（MFDA）2（HCOO）2（H2O）6]·H2O}n（1）（H2MFDA=9,9-二甲基芴-2,7-二羧酸）已通过溶剂热合成法合成并进行了结构表征。1 具有三维 pcu 型棒状堆积结构，具有一维菱形通道。1 的骨架可以沿着 c 轴可逆地收缩/膨胀，这是由于部分/完全释放水分子所致。相应地，菱形通道变窄/变宽，1 转变为窄孔 1a/大孔 1b。1、1a 和 1b 的激发和发射光谱几乎相同，Eu（III）具有强特征红光发射。观察到 1 的光致发光量子产率为 77%，发光寿命约为 1.1 ms。通过在 DMF 中的荧光猝灭实验研究了 1b 对 Fe（3+）离子和 PA 的传感性能，结果表明 1b 是一种潜在的关闭发光感应材料，可用于选择性检测 Fe（3+）离子和 PA，其检测限分别约为 10（-7）M。还研究了 Fe（3+）离子和 PA 的荧光猝灭机制。
