Publications by authors named "Robert Oestreich"

We present the synthesis of two porous complementary tetrahedral TriTri imine cages, exhibiting Brunauer-Emmett-Teller (BET) surface areas of 591 m g and 753 m g, suitable for the adsorption of H, CO, and CH. Comparisons in terms of crystallinity, thermal stability, porosity, and selectivity highlight the promising properties of fluorinated and non-fluorinated porous organic cages as functional materials.

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Herein, we report polyphosphonate covalent organic frameworks (COFs) constructed via P-O-P linkages. The materials are synthesized via a single-step condensation reaction of the charge-assisted hydrogen-bonded organic framework, which is constructed from phenylphosphonic acid and 5,10,15,20-tetrakis[p-phenylphosphonic acid]porphyrin and is formed by simply heating its hydrogen-bonded precursor without using chemical reagents. Above 210 °C, it becomes an amorphous microporous polymeric structure due to the oligomerization of P-O-P bonds, which could be shown by constant-time solid-state double-quantum P nuclear magnetic resonance experiments.

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A newly synthesized series of bimetallic CPM-37(Ni,Fe) metal-organic frameworks with different iron content (Ni/Fe ≈ 2, 1, 0.5, named CPM-37(NiFe), CPM-37(NiFe) and CPM-37(NiFe)) demonstrated high N-based specific surface areas of 2039, 1955, and 2378 m g for CPM-37(NiFe), CPM-37(NiFe), and CPM-37(NiFe), having much higher values compared to the monometallic CPM-37(Ni) and CPM-37(Fe) with 87 and 368 m g only. It is rationalized that the mixed-metal nature of the materials increases the structural robustness due to the better charge balance at the coordination bonded cluster, which opens interesting application-oriented possibilities for mixed-metal CPM-37 and other less-stable MOFs.

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Certain types of face masks are highly efficient in protecting humans from bacterial and viral pathogens, and growing concerns with high safety, low cost, and wide market suitability have accelerated the replacement of reusable face masks with disposable ones during the last decades. However, wearing these masks creates countless problems associated with personnel comfort as well as more significant issues related to the cost of fabrication, the generation of medical waste, and environmental contaminants. In this work, we present a facile spray-pressing technique for the production of P-masks with a potential scale-up prospect by adding a graphene layer on one side of meltblown fabric and a functional layer on the other side.

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Metal-organic frameworks (MOFs) have been investigated with regard to the oxygen evolution reaction (OER) due to their structure diversity, high specific surface area, adjustable pore size, and abundant active sites. However, the poor conductivity of most MOFs restricts this application. Herein, through a facile one-step solvothermal method, the Ni-based pillared metal-organic framework [Ni(BDC)DABCO] (BDC = 1,4-benzenedicarboxylate, DABCO = 1,4-diazabicyclo[2.

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Gas-phase infiltration of the carbonylchloridogold(I), Au(CO)Cl precursor into the pores of HKUST-1 ([Cu(BTC)(HO)], Cu-BTC) SURMOFs (surface-mounted metal-organic frameworks; BTC = benzene-1,3,5-tricarboxylate) leads to Au(CO)Cl decomposition within the MOF through hydrolysis with the aqua ligands on Cu. Small Au clusters with an average atom number of x ≈ 5 are formed in the medium-sized pores of the HKUST-1 matrix. These gold nanoclusters are homogeneously distributed and crystallographically ordered, which was supported by simulations of the powder X-ray diffractometric characterization.

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Article Synopsis
  • HHUD-4 is a newly synthesized metal-organic framework (MOF) created from linear acetylenedicarboxylic acid and indium nitrate, showcasing unique structural features compared to typical MOFs.
  • This MOF possesses a high BET surface area of 940 m²/g and notable adsorption capabilities for gases like CO and CH₄, indicating its potential for various applications.
  • While HHUD-4 exhibits limited water uptake and stability, it demonstrates impressive VOC adsorption, particularly with a selectivity of 17 for separating benzene from cyclohexane.
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The metal-organic framework (MOF) [Zn(Isa-az-tmpz)]·~1-1.5 DMF with the novel T-shaped bifunctional linker 5-(2-(1,3,5-trimethyl-1H-pyrazol-4-yl)azo)isophthalate (Isa-az-tmpz) was obtained as a conglomerate of crystals with varying degrees of enantiomeric excess in the chiral tetragonal space groups P422 or P422. A topological analysis of the compound resulted in the rare -topology, deviating from the expected -topology, which has been found before in pyrazolate-isophthalate-functionalized MOFs using the supramolecular building layer (SBL) approach.

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