A New Fluorescence MOF for Highly Sensitive Detection of Acetylacetone

A novel metal-organic framework (MOF) assembled by a semi-rigid tricarboxylate, namely, 5-(3,4-dicarboxylphenoxy) nicotic acid (H3L) has been solvothermally synthesized: [Zn-3(L)(2)(H2O)(2)] . 3H(2)O 1. Single-crystal X-ray diffraction analysis indicates that MOF 1 shows 2-D layer with quadrangle channels along the a axis (ca. 7.0x8.3 angstrom(2)). The 2-D layer self-assembles into a final 3-D supramolecular network via the interlayer pi MIDLINE HORIZONTAL ELLIPSIS pi interactions. The photoluminescence investigations indicate that 1 can selectively and sensitively detect acetylacetone (acac) with high K-SV value of 3.597x10(4) M-1 and low limit of detection (LOD) of 50.77 ppb. Further mechanism studies have shown that static photo-competitive absorption, photoinduced electron transfer and H-bonding interaction between chemosensor and the analyte may be the primary causes of the fluorescence quenching effect for acac.

Automated summary

A novel metal-organic framework (MOF) assembled by a semi-rigid tricarboxylate showed excellent selectivity and sensitivity in detecting acetylacetone (acac) due to mechanisms involving static photo-competitive absorption, photoinduced electron transfer, and H-bonding interaction between the chemosensor and the analyte.