Fluorescence Enhancement of a Metal‐Organic Framework for Ultra‐Efficient Detection of Trace Benzene Vapor

Abstract

Indoor detection of volatile organic compounds (VOCs) concentration is necessary due to the serious toxicity hazards even at trace level. However, physisorbents usually exhibit weak interactions especially in the presence of trace concentrations of VOCs, thus exhibiting poor responsive signal. Herein, we report a new flexible metal–organic framework (MOF) that exhibits interesting pore‐opening behavior after immersing in H2O. The pore‐opening phase shows significant (≈116 folds) and extremely fast (<1 minute) fluorescence enhancement after being exposed to saturated benzene vapor. The limit of detection concentration for benzene vapor can be calculated as 0.133 mg L−1. Thus this material represents the first MOF to achieve visual detection of trace benzene vapor by the naked eyes. Theoretical calculations and single‐crystal structure reveal that the special “bilateral π–π stacking” interactions between the host and guest, which facilitate electron transfer and greatly enhance the intensity of fluorescence.

Double-walled Al-based MOF with large microporous specific surface area for trace benzene adsorption

“…5d and Fig. S16a, in bule lines), and also bound to the C -H sectors of ligands through C -H(L) ⋯ π(Bz) interactions 33 with the distance of 3.13-4.95 Å (Fig. 5d and Fig.…”

Robust lanthanide MOFs as multifunctional luminescent sensors for intelligent visualization monitoring of MEAA and texture code anti-counterfeiting applications

“…S7, ESI†). 51,52 The emission spectrum of 1-Eu was measured at a maximum excitation wavelength of 312 nm (Fig. S8a, ESI†), and 1-Eu exhibited five peaks at 583, 592, 614, 652 and 699 nm (Fig.…”

Fluorescence sensing and device fabrication with luminescent metal–organic frameworks

“…Mo and co-workers constructed a new flexible MOF called [Sr 2 (BINDI)(DMF)(H 2 O)]·0.8DMF (WYU-61) using electron-deficient NDI ligands. 71 Interestingly, WYU-61 can be rapidly transformed from a 0D pore framework to a 1D pore framework, [Sr 2 (BINDI)(H 2 O) 2 ]·7H 2 O (WYU-62), after immersion in water, which is conducive to the diffusion of aromatic hydrocarbon molecules into the pore. The interaction between the ligands and benzene molecules in the framework leads to rapid and significant fluorescence enhancement of MOFs, which enables visual detection of trace benzene vapor for the first time.…”