Host-Guest Interaction Optimization through Cavity Functionalization for Ultra-Fast and Efficient Water Purification by a Metal-Organic Framework

Inorganic Chemistry
Sayed Ali Akbar RazaviAli Morsali

Abstract

To achieve optimized host-guest interactions, a "cavity functionalization" approach has been applied using two isostructure MOFs, [Zn(OBA)(BPDB)0.5] n·2DMF (TMU-4) and [Zn(OBA)(H2DPT)0.5] n·DMF (TMU-34), where H2OBA = 4,4'-oxybis(benzoic acid), BPDB = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene, and H2DPT = 3,6-di(pyridin-4-yl)-1,4-dihydro-1,2,4,5-tetrazine. TMU-4 and TMU-34 are functionalized with azine and dihydro-tetrazine groups, respectively. Both of these functions can act as Lewis basic sites, but only the dihydro-tetrazine function inside the cavities of TMU-34 can act as a hydrogen bond donor site. These frameworks were applied in removal of pollutant dyes. The results indicate that TMU-34 can remove rose-bengal B (RB-B) from aqueous solution much more than TMU-4, through size selective and optimized host-guest interaction mechanisms. We believe that the preferred hydrogen bond interaction between RB-B free phenolate/carboxylate and dihydro-tetrazine hydrogens of TMU-34 is responsible for the drastic enhancement in the adsorption capacity and removal kinetics of TMU-34 rather than TMU-4. Our strategy in this work clearly shows that (i) high surface area and porosity as well as rational decoration of MOF cavities with or...Continue Reading

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Jun 18, 2017·Chemistry : a European Journal·Sayed Ali Akbar RazaviAli Morsali
Nov 16, 2017·Ultrasonics Sonochemistry·Sayed Ali Akbar RazaviAli Morsali

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