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  1. Free, publicly-accessible full text available June 1, 2024
  2. Free, publicly-accessible full text available April 10, 2024
  3. We report the electrocatalytic Oxygen Reduction Reaction on a rigid Co( ii ) porphyrin prism scaffold bridged by Ag( i ) ions. The reactivity of this scaffold differs significantly from previous prism catalysts in that its selectivity is similar to that of monomer (∼35% H 2 O) yet it displays sluggish kinetics, with an order of magnitude lower k s of ∼0.5 M −1 s −1 . The deleterious cofacial effect is not simply due to metal–metal separation, which is similar to our most selective prism catalysts. Instead we conclude the structural rigidity is responsible for these differences. 
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  4. Abstract BACKGROUND

    Root‐knot nematodes (RKNs), includingMeloidogynespecies, are among the most destructive plant‐parasites worldwide. Recent evidence suggests that entomopathogenic fungi (EPF) can antagonize RKNs. Such antagonistic effects are likely mediated by toxic metabolites, including volatile organic compounds (VOCs), produced by the fungi. However, how widespread these effects are across EPF species, and which VOCs mediate negative interactions between EPF and RKNs needs to be further elucidated.

    RESULTS

    First, we evaluated the nematicidal effect of VOCs emitted by 46 EPF isolates againstMeloidogyne incognitaand found variable toxicity depending on the isolate. Second, we measured the nematicidal effect of highly toxic isolates, including species in the genusTalaromyces,Aspergillus,Clonostachys, andPurpureocilliumand, third, we analyzed the nematicidal effect of major VOCs, including 2‐methyl‐1‐propanol, 3‐methyl‐1‐butanol, isopropyl alcohol and 2‐methyl‐3‐pentanone. The mortality ofM. incognitajuveniles (J2s) was generally high (50%) either via airborne or in‐solution contact with VOCs. Moreover, the tested VOCs significantly inhibited egg hatching, and repelled J2s away from the VOCs.

    CONCLUSION

    This study not only provides insights into the ecological function of VOCs in the rhizosphere, but also provides new approaches for developing environmentally friendly control methods of RKNs in agroecosystems. © 2023 Society of Chemical Industry.

     
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  5. Abstract

    Simultaneous removal of trace amounts of propyne and propadiene from propylene is an important but challenging industrial process. We report herein a class of microporous metal–organic frameworks (NKMOF‐1‐M) with exceptional water stability and remarkably high uptakes for both propyne and propadiene at low pressures.NKMOF‐1‐Mseparated a ternary propyne/propadiene/propylene (0.5 : 0.5 : 99.0) mixture with the highest reported selectivity for the production of polymer‐grade propylene (99.996 %) at ambient temperature, as attributed to its strong binding affinity for propyne and propadiene over propylene. Moreover, we were able to visualize propyne and propadiene molecules in the single‐crystal structure ofNKMOF‐1‐Mthrough a convenient approach under ambient conditions, which helped to precisely understand the binding sites and affinity for propyne and propadiene. These results provide important guidance on using ultramicroporous MOFs as physisorbent materials.

     
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  6. Abstract

    Simultaneous removal of trace amounts of propyne and propadiene from propylene is an important but challenging industrial process. We report herein a class of microporous metal–organic frameworks (NKMOF‐1‐M) with exceptional water stability and remarkably high uptakes for both propyne and propadiene at low pressures.NKMOF‐1‐Mseparated a ternary propyne/propadiene/propylene (0.5 : 0.5 : 99.0) mixture with the highest reported selectivity for the production of polymer‐grade propylene (99.996 %) at ambient temperature, as attributed to its strong binding affinity for propyne and propadiene over propylene. Moreover, we were able to visualize propyne and propadiene molecules in the single‐crystal structure ofNKMOF‐1‐Mthrough a convenient approach under ambient conditions, which helped to precisely understand the binding sites and affinity for propyne and propadiene. These results provide important guidance on using ultramicroporous MOFs as physisorbent materials.

     
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