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Published on: June 28, 2019
Coordination-Site-Engineered Hydrophilic Ln-MOFs for Ultrasensitive Ratiometric Sensing of Trace H2O in D2O
Shantao Li1, Yanlin Hong1, Junchao Liu1
1Anhui Province Key Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu241000, P. R. China.
Abstract:
Trace H2O detection in D2O is important for isotope-related technologies but remains challenging owing to subtle isotopologue differences. Herein, we propose a coordination-site engineering strategy based on hydrophilic lanthanide MOFs. Tuning Ln3+ coordination strengthens framework-isotopologue interactions and amplifies isotope-dependent nonradiative quenching. Eu(BTC)(H2O) and Eu(BTC)(H2O)6 reveal that coordinated water governs hydrophilicity, vibrational coupling, and sensing performance. Activation exposes accessible lanthanide sites, while Tb3+ enables a self-calibrated I545/I618 ratiometric signal. Optimized Eu0.15Tb0.85(BTC) achieves linear detection with a 0.023 vol % H2O limit and supports smartphone-assisted fluorescence/photocurrent dual-mode sensing.
