Tactile Sensors: Hydroxyl Decorated Silver Metal–Organic Frameworks for Detecting Cr₂O₇^2–, MnO₄^–, Humic Acid, and Fe³⁺ Ions

Anionic, acidic, and metal ions are common contaminants in water and cause serious concerns for human and aquatic life. With the goal of rapid detection of analytes, we herein design a new array of ligand 5-(4 H -1,2,4-triazol-4-yl)pyridin-3-ol-linked silver coordinated metal–organic frameworks Ag-MOFs as a promising sensor for Cr 2 O 7 2–, MnO 4 –, humic acid (HA), and Fe 3+ ions down to the micro level. Furthermore, as evidenced by luminescence, excitation-emission matrix (EEM) spectroscopic, and PXRD measurements, designed metal–organic frameworks (MOFs) can be fast, stable, and reusable for analyte detection in water.