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Enhancing the Fe 3+ Sensing Sensitivity by Energy Transfer and Phase Transformation in a Bimetallic Lanthanide Metal‐Organic Framework
Author(s) -
Song XueZhi,
Wang YuXiang,
Yan JiaWei,
Chen Xi,
Meng YuLan,
Tan Zhenquan
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802147
Subject(s) - bimetallic strip , lanthanide , luminescence , stacking , protonation , phase (matter) , ligand (biochemistry) , metal organic framework , materials science , metal , quenching (fluorescence) , gadolinium , pyridine , crystallography , europium , photon upconversion , ion , chemistry , fluorescence , organic chemistry , metallurgy , physics , optoelectronics , biochemistry , receptor , adsorption , quantum mechanics
Two novel lanthanide metal‐organic frameworks (LnMOFs), {[Me 2 NH 2 ] 2 [Eu 4 (L) 5 (SO 4 ) 2 ]⋅H 2 O} n (EuMOF‐ 1 ) and {[Me 2 NH 2 ][Tb(L)(SO 4 )(H 2 O)]} n (TbMOF‐ 2 ), were successfully synthesized by using protonated pyridine‐3,5‐dicarboxylic acid sulfate ligand (H 3 L + ⋅1/2SO 4 2− ) under identical solvthermal conditions. To our delight, structural analyses indicate that these two LnMOFs (Ln=Eu or Tb) exhibit two extremely different structures in terms of three‐dimensional open framework and two‐dimensional stacking layered network, which is entirely different from the usual isostructures of LnMOFs (Ln=Eu and Tb). The “Gadolinium break” effect was unprecedentedly observed, leading to phase transformation from EuMOF‐ 1 to TbMOF‐ 2 by gradual decrease of Eu content. A serious of bimetallic Eu x Tb 1− x MOFs ( x =0.8, 0.6, 0.4, 0.2) materials during phase transformation process were achieved. When evaluated as luminescent quenching sensors for Fe 3+ ion, the K SV constant was increased by 36.6% from monometallic EuMOF‐ 1 to bimetallic Eu 0.6 Tb 0.4 MOF. Additionally, the exclusive sensing and its enhancing mechanism towards Fe 3+ are further discussed. This work would establish a new strategy for enhancing the sensing performance of luminescent lanthanide MOFs.