Ratiometric Fluorescence Thermometry, Quantitative Gossypol Detection, and CO2 Chemical Fixation by a Multipurpose Europium (III) Metal-Organic Framework

A lanthanide-basedmolecular crystalline material endows metal-organicframeworks (MOFs) with many fascinating applications such as fluorescencedetection and CO2 chemical fixation. Herein, we describeand study a multipurpose europium(III) MOF with the formula of {[Eu-2(TATAB)(2)]& BULL;2.5H(2)O & BULL;2DMF}( n ) (Eu-MOF) (where H(3)TATAB is 4,4 & PRIME;,4 & DPRIME;-((1,3,5-triazine-2,4,6-triyl)tris(azanediyl))tribenzoicacid ligand) for photoluminescence sensor matrix and CO2 chemical fixation. This Eu-MOF features 1D square channelsalong the c direction with a pore size of ca.14.07 & ANGS; x 14.07 & ANGS;, occupied by lattice water and DMF molecules. The obtained Eu-MOF can achieve simultaneous luminescence of the H(3)TATAB ligand and Eu3+ ions, which can be developedas the sensor matrix for ratiometric fluorescence thermometry. Theluminescence of the Eu-MOF demonstrates an obvious colorchange from red to yellow as temperature rises from 303 to 373 K andthe Eu-MOF has a satisfying relative sensitivity of 3.21%K-1 and a small temperature uncertainty of 0.0093K at 333 K. Moreover, sensitive detection of gossypol was achievedwith a quenching constant K (sv) of 1.18x 10(5) M-1 and a detection limitof 4.61 & mu;M. A combination of the competitive absorption andphotoinduced electron transfer caused by host-guest interactionsand strengthened & pi;-& pi; packing effect synergisticallybetween gossypol molecules and the Eu-MOF skeleton realizesthe "turn-off" sensing of gossypol. Importantly, thenature of the Eu-MOF allows showing CO2 chemicalfixation under mild conditions. Thus, the Eu-MOF canbe utilized as a multipurpose material for ratiometric fluorescencethermometry, quantitative gossypol detection, and CO2 chemicalfixation. Herein, we describe and studya multipurpose europium(III)MOF with the formula of {[Eu-2(TATAB)(2)]& BULL;2.5H(2)O & BULL;2DMF}( n ) (Eu-MOF) (where H(3)TATAB is 4,4 & PRIME;,4 & DPRIME;-((1,3,5-triazine-2,4,6-triyl)tris(azanediyl))tribenzoicacid ligand) for photoluminescence sensor matrix and CO2 chemical fixation.