Validation of ‘lock-and-key’ mechanism of a metal–organic framework in selective sensing of triethylamine

摘要: To develop the metal–organic framework (MOF)-based sensing of triethylamine (TEA) in an aqueous phase, Al-MIL-101-NH2 (MIL: Material Institute Lavoisier) with a tripod-like cavity was utilized based on lock-and-key model. (Al-MOF) found to be excellent fluorescent sensor for TEA molecules range 0.05–0.99 mM. The limit detection (LOD) and linear calibration this probe towards were 3 μM 0.05–0.40 mM, respectively. mechanism process indicates dominant role physical processes (e.g., non-covalent bond interactions). In addition, exact fit molecule (6.5 A) (6.78 supported strong interaction between three ethyl groups aromatic rings (MOF). This kind specific suitability size/shape MOF (ΔG: −46.7 kJ mol−1) not other such as ethylamine −2.20 mol−1 size: 3.7 A), formaldehyde +1.50 2.8 ammonia +0.71 1.6 A). As such, Al-MOF selective stable TEA.