Macromol. Rapid Commun. 17/2015

Yang, Li‐Ye; Li, Wenying; Huang, Yanyu; Zhou, Yangliang; Chen, Tianfeng

doi:10.1002/marc.201570067

Cited by 2 publications

(3 citation statements)

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“…The SEM data shows the destruction of the bare, uncoated PS‐poly(HIPE) at around 400 °C (Figure S1, Supporting Information), which is consistent with the decomposition‐onset temperature of PS ( T decomp (PS) ≈ 400 °C). [ 76 ] Qualitatively, the SEM images (Figure 2D, inset) show that PS‐PEDOT retains the template architecture while the bare PS‐poly(HIPE) decomposes into particulate carbon (Figure 1B) upon pyrolysis.…”

Section: Resultsmentioning

confidence: 99%

Macroscale Fabrication of Lightweight and Strong Porous Carbon Foams through Template‐Coating Pair Design

2023

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Manufacturing of low‐density‐high‐strength carbon foams can benefit the construction, transportation, and packaging industries. One successful route to lightweight and mechanically strong carbon foams involves pyrolysis of polymeric architectures, which is inevitably accompanied by drastic volumetric shrinkage (usually >98%). As such, a challenge of these materials lies in maintaining bulk dimensions of building struts that span orders of magnitude difference in length scale from centimeters to nanometers. This work demonstrates fabrication of macroscale low‐density‐high‐strength carbon foams that feature exceptional dimensional stability through pyrolysis of robust template‐coating pairs. The template serves as the architectural blueprint and contains strength‐imparting properties (e.g., high node density and small strut dimensions); it is composed of a low char‐yielding porous polystyrene backbone with a high carbonization‐onset temperature. The coating serves to imprint and transcribe the template architecture into pyrolytic carbon; it is composed of a high char‐yielding conjugated polymer with a relatively low carbonization‐onset temperature. The designed carbonization mismatch enables structural inheritance, while the decomposition mismatch affords hollow struts, minimizing density. The carbons synthesized through this new framework exhibit remarkable dimensional stability (≈80% dimension retention; ≈50% volume retention) and some of the highest specific strengths (≈0.13 GPa g−1 cm3) among reported carbon foams derived from porous polymer templates.

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Section: Resultsmentioning

confidence: 99%

Macroscale Fabrication of Lightweight and Strong Porous Carbon Foams through Template‐Coating Pair Design

2023

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“…Full characterization data and spectra for 29 a – k , 31 – 77 and single crystal X‐ray diffraction data for 29 a (deposition number 2223207), 29 h (deposition number 2223208), 50 (deposition number 2223206), and 62 (deposition number 2223208) can be found in the supporting information section. Additional references cited within the Supporting Information [1–20] …”

Section: Supporting Informationmentioning

confidence: 99%

“…For instance, selenocysteine is an essential and indispensable dietary micronutrient needed for the biological activity of several important enzymes, such as thioredoxin reductase (TrxR), glutathione peroxidase (GSH−Px), and deiodinase [13–17] . Numerous selenium‐containing species also display decent anticancer activity [18–25] . Despite the abundance of numerous known urease inhibitors, [26–28] novel selenoorganic urease inhibitors based on the 1,2‐benzisoselenazol‐3(2H)‐one scaffold have also emerged as potential drugs [29] .…”

Section: Introductionmentioning

confidence: 99%

First Exclusive Stereo‐ and Regioselective Preparation of 5‐Arylimino‐1,3,4‐Selenadiazole Derivatives: Synthesis, NMR analysis, and Computational Studies

Moussa

Paz

Khalaf

et al. 2023

Chemistry An Asian Journal

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Isoselenocyanates are valuable coupling partners required for preparing key chemical intermediates and biologically active molecules in an accelerated and effective way. Likewise, (Z)‐2‐oxo‐N‐phenylpropanehydrazonoyl chlorides have been employed in numerous one‐step heteroannulation reactions to assemble the structural core of several various kinds of heterocyclic compounds. Here, we describe the inverse electron demand 1,3‐dipolar cycloaddition reaction of isoselenocyanates with a variety of substituted (Z)‐2‐oxo‐N‐phenylpropanehydrazonoyl chlorides to generate, regioselectively and stereoselectively, a series of 5‐arylimino‐1,3,4‐selenadiazole derivatives comprising a multitude of functional groups on both aryl rings. The synthetic method features gentle room‐temperature conditions, wide substrate scope, and good to high reaction yields. The selenadiazoles were separated by gravity filtration in all instances and chemical structures were validated by multinuclear NMR spectroscopy and high accuracy mass spectral measurements. First conclusive molecular structure elucidation of the observed 5‐arylimino‐selenadiazole regioisomer was verified by single‐crystal X‐ray diffraction analysis. Crystal‐structure measurement was successfully carried out on (Z)‐1‐(4‐(4‐iodophenyl)‐5‐(p‐tolylimino)‐4,5‐dihydro‐1,3,4‐selenadiazol‐2‐yl)ethan‐1‐one and (Z)‐1‐(5‐((4‐methoxyphenyl)imino)‐4‐(4‐(methylthio)phenyl)‐4,5‐dihydro‐1,3,4‐selenadiazol‐2‐yl)ethan‐1‐one. Likewise, the (Z)‐geometry of the hydrazonoyl chloride reactant was proven by X‐ray diffraction studies. As representative examples, crystal‐structure determination was carried out on (Z)‐2‐oxo‐N‐phenylpropanehydrazonoyl chloride and (Z)‐N‐(3,5‐bis(trifluoromethyl)phenyl)‐2‐oxopropanehydrazonoyl chloride. Density functional theory calculations at the B3LYP‐D4/def2‐TZVP level were conducted to support the noted experimental findings and suggested mechanism.

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Macromol. Rapid Commun. 17/2015

Cited by 2 publications

References 0 publications

Macroscale Fabrication of Lightweight and Strong Porous Carbon Foams through Template‐Coating Pair Design

Macroscale Fabrication of Lightweight and Strong Porous Carbon Foams through Template‐Coating Pair Design

First Exclusive Stereo‐ and Regioselective Preparation of 5‐Arylimino‐1,3,4‐Selenadiazole Derivatives: Synthesis, NMR analysis, and Computational Studies

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