A bifunctionalised Pb-based MOF for iodine capture and dyes removal Samrah Kamal, Mohd Khalid Functional Inorganic Materials Lab (FIML), Department of Chemistry, Aligarh Muslim University, Aligarh, India A 2-Dimensional Pb(II) metal-organic framework, [Pb(bdc) 0.5 (py-Phen)NO 3 ] n ( SM-3 ) was synthesized under solvothermal conditions utilizing a mixed ligand approach. SM-3 assembled through dinuclear SBUs [Pb 2 (COO) 2 ] 2- , oxygen donor H 2 bdc = 1,4-benzene dicarboxylic acid, and nitrogen donor py-Phen = pyrazino[2,3-f] [1,10]-phenanthroline linkers. SM-3 was characterized by elemental analysis, FT-IR, powder-X-ray diffraction, thermal gravimetric analysis, SEM, EDS, and single-crystal X-ray diffraction techniques. Crystallographic studies confirmed that SM-3 displays 2D layered structure with unique anagostic (Pb···H) interactions. Interestingly, the presence of abundant π-electron-rich rings embellished with free -N donor sites in the framework makes SM- 3 an excellent adsorbent and displays adsorption performance for iodine and dyes. The experimental results show that SM-3 reverses radioactive iodine in the solution and vapor phase and exhibits selective adsorption of hazardous cationic dyes, i.e., methylene blue (MB) and rhodamine-B (Rh-B) from aqueous solution. Moreover, the possible mechanism of iodine and dye adsorption was also discussed in detail. Thus, this work is remarkable for coordination chemists to engineer layered MOFs for adsorption purposes and expands their potential characteristics by converting them into 2D MOF nanosheets to further enhance the adsorption performance of hazardous pollutants for environment protection. References 1. S. Kamal, M. Khalid, M.S. Khan, M. Shahid, M. Ahmad, Amine-and Imine-Functionalized Mn-Based MOF as an Unusual Turn-On and Turn-Off Sensor for d 10 Heavy Metal Ions and an Efficient Adsorbent to Capture Iodine, Cryst. Growth Des. ,2022, 22 , 3277-3294. 2. S. Khan, M. Khalid, M. S. Ahmad, M. Shahid, and M. Ahmad, Three-in-one is really better: exploring the sensing and adsorption properties in a newly designed metal–organic system incorporating a copper (II) ion. Dalton Trans. ,2019, 48 , 12918-12932.
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