The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. COA of Formula: https://www.ambeed.com/products/101187-40-0.html, 101187-40-0, Name is tert-Butyl (2-(2-(2-(2-aminoethoxy)ethoxy)ethoxy)ethyl)carbamate, SMILES is O=C(OC(C)(C)C)NCCOCCOCCOCCN, in an article , author is Wang, Wan-Qiang, once mentioned of 101187-40-0.
During the formation of magnesium-organic frameworks, the coordination sphere of magnesium tends to be partially occupied by O-containing solvent molecules such as amides, which will dramatically decrease the symmetry of Mg-organic frameworks and thus lead to low stability. It is noted that up to now, most reported Mg-metal-organic frameworks (MOFs) (>80%) crystallize in the space groups whose symmetry is lower than that of a tetragonal system. In this work, we demonstrate that acetate (Ac) may act as modulator to eliminate the influence of amide solvent and improve the symmetry of Mg-organic frameworks. Two novel Mg-MOFs, namely, {[(CH3)NH3](4)[Mg-3(BTB)(8/3)(Ac)(2)(H2O)(n) (SNNU-35, H3BTB = 4′,4,4′ -benzene-1,3,5-tribenzoic acid) and {[(CH3)(2)NH2]-[Mg-2(FDA)(2)(Ac)]}(n) (SNNU-36, H(2)FDA = 2,5-furandicarboxylic acid) were successfully designed, which crystallize in rhombohedral R-3 and tetragonal I4/mmm space groups, respectively. Four independent BTB ligands link three unique Mg cations and generate superlarge [Mg21BTB17] nanocages, which interlock each other by strong pi…pi stacking to give a two-fold interpenetrating architecture of SNNU-35. On the other hand, carboxylate and acetate groups chelate Mg atoms to form one-dimensional chains, which are extended by FDA to produce the rod-packing framework of SNNU-36. Two microporous Mg-MOFs both exhibit notable CO2 and H-2 uptakes. H3BTB and H(2)FDA ligands both have emission features, and Mg ions usually can enhance the fluorescent intensity, which lead to a strong solid-state luminescence emission property of SNNU-35 and -36. Importantly, two Mg-MOF5 both show fast and quantative sensing performance for nitrocompounds. Among three selected models of substrate, SNNU-35 and-36 can eliminate the interference of nitromethane (NM) and exhibit high sensitivity to nitrobenzene (NB) and o-nitrotoluene (2-NT) with large k, values (>10(5) M-1). Especially, the fluorescence quenching efficiency of NB (5000 ppm) and 2-NT (8000 ppm) can reach 96.3% and 89.5% and 85.0% and 83.7% for SNNU-35 and -36, respectively. This work offers not only an effective route to improve the symmetry of magnesium organic frameworks but also two potential fluorescence sensors for nitroaromatic compounds.
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Reference:
Amide – Wikipedia,
,Amide – an overview | ScienceDirect Topics