Abstract
We report herein a new microporous neutral three-dimensional (3D) metal–organic framework [Cu2(L)(DMF)(H2O)]·guest (1·guest) composed of copper paddle-wheel and flexible tetracarboxylic acid linkers (DMF = N,N-dimethylformamide, H4L = tetrakis[(6-carboxynaphthoxy)methyl]methane). Surprisingly, this MOF with neutral cavities can not only extract pure quercetin (QT) but also convert it into Cu–QT during the desorption process. It has been well characterized by UV-vis, IR, ESI-MS and TEM-EDS studies. Moreover, it can efficiently extract natural product QT from fresh QT-rich onion juice and rapidly convert it into Cu–QT with a relatively high conversion rate.
Highlights
Quercetin (QT, C15H10O7, IUPAC name 2-(3,4-dihydroxyphenyl)3,5,7-trihydroxy-4H-chromen-4-one, see Fig. S1†), a well-known dietary polyphenolic compound, widely exists in a variety of vegetables and fruits, such as onions,[1] red kidney beans, plums, apples, and black and green teas.[2]
Paddle-wheel Cu2(COO)[4] SBUs are bridged by L4À to form a 3D net of PtS-type topology, which resembles that of metal–organic frameworks (MOFs)-505 and HKUST-1 (Fig. 1a and b).[18]
PLATON analysis indicates that the solvent accessible volume and porosity are 11 046.5 A3 and 60.7%, respectively. This framework is neutral and the highly disordered solvent molecules reside in the pores
Summary
Quercetin (QT, C15H10O7, IUPAC name 2-(3,4-dihydroxyphenyl)3,5,7-trihydroxy-4H-chromen-4-one, see Fig. S1†), a well-known dietary polyphenolic compound, widely exists in a variety of vegetables and fruits, such as onions,[1] red kidney beans, plums, apples, and black and green teas.[2]. To obtain the solvent-free material, 5 mg of compound 1$guest was immersed in ethanol at ambient temperature for 24 h, subsequently dried at 80 C for 12 h to yield 1.
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