Coordination-Site-Engineered Hydrophilic Ln-MOFs for Ultrasensitive Ratiometric Sensing of Trace H₂O in D₂O.

Authors

Shantao Li, Yanlin Hong, Junchao Liu, Jincheng Jin, Yignqiang Fu, Daxiang Gui

Published in

Inorganic chemistry. Jul 16, 2026. Epub Jul 16, 2026.

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 Eu_0.15Tb_0.85(BTC) achieves linear detection with a 0.023 vol % H₂O limit and supports smartphone-assisted fluorescence/photocurrent dual-mode sensing.

PMID:
42460545
Bibliographic data and abstract were imported from PubMed on 16 Jul 2026.

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