A Terbium‐Organic Framework Material for Highly Sensitive Sensing of Fe3+ in Aqueous and Biological Systems: Experimental Studies and Theoretical Analysis. Issue 13 (19th August 2016) - Han, Min‐Le
Abstract: Owing to the paramount importance of iron in biological and environmental systems, advanced agents towards the detection of iron ions with high sensitivity and selectivity have been targeted for decades.Here a new super water‐stable agent, namely terbium metal‐organic framework (Tb‐MOF), [H2 N(CH3 )2 ][Tb(cppa)2 (H2 ‐ O)2 ], (CTGU‐1, CTGU=China Three Gorges University, H2 cppa=5‐(4‐carboxyphenyl)picolinic acid), has been successfully synthesized and demonstrated as a fluorescent turn‐off sensor for highly sensitive detection of Fe 3+ with the detection limit of 10 −9 M in dimethylformamide (DMF), 10 −7 M in water and 10 −7 M in biological environment, respectively. Such detecting capacity, to our knowledge, is the best compared to those of reported lanthanide‐baed MOF fluorescent probes so far. With the combination of first principle calculations, the detecting capacity has been analysed from the interaction between metal ions and organic ligands, particularly the effect of metal ions on the frontier molecular orbitals. This work offers a new Ln–MOF probe towards the detection of metal irons with high sensitivity and selectivity. Abstract : Adding metal ions to the terbium‐organic framework containing Lewis basic uncoordinated carboxylic oxygen sites leads to significant quenching of luminescence because of the different nature of the metal guest‐ligand interactions. The first‐principles method, from an electronic point of view, has been used to understand the nature of the inter‐molecular interactions between organic ligand and metal ions.