SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "L773:2192 6506 srt2:(2020-2024)"

Sökning: L773:2192 6506 > (2020-2024)

  • Resultat 1-11 av 11
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Arja, Katriann, et al. (författare)
  • Self-Assembly of Chiro-Optical Materials from Nonchiral Oligothiophene-Porphyrin Derivatives and Random Coil Synthetic Peptides
  • 2023
  • Ingår i: ChemPlusChem. - : Wiley. - 2192-6506. ; 88:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Biomimetic chiral optoelectronic materials can be utilized in electronic devices, biosensors and artificial enzymes. Herein, this work reports the chiro-optical properties and architectural arrangement of optoelectronic materials generated from self-assembly of initially nonchiral oligothiophene−porphyrin derivatives and random coil synthetic peptides. The photo-physical- and structural properties of the materials were assessed by absorption-, fluorescence- and circular dichroism spectroscopy, as well as dynamic light scattering, scanning electron microscopy and theoretical calculations. The materials display a three-dimensional ordered helical structure and optical activity that are observed due to an induced chirality of the optoelectronic element upon interaction with the peptide. Both these properties are influenced by the chemical composition of the oligothiophene−porphyrin derivative, as well as the peptide sequence. We foresee that our findings will aid in developing self-assembled optoelectronic materials with dynamic architectonical accuracies, as well as offer the possibility to generate the next generation of materials for a variety of bioelectronic applications. 
  •  
2.
  • Berniak, Tomasz, et al. (författare)
  • Covalent bonding of N-hydroxyphthalimide on mesoporous silica for catalytic aerobic oxidation of p-xylene at atmospheric pressure
  • 2024
  • Ingår i: ChemPlusChem. - 2192-6506.
  • Tidskriftsartikel (refereegranskat)abstract
    • The surface of SBA-15 mesoporous silica was modified by N-hydroxyphthalimide (NHPI) moieties acting as immobilized active species for aerobic oxidation of alkylaromatic hydrocarbons. The incorporation was carried out by four original approaches: the grafting-from and grafting-onto techniques, using the presence of surface silanols enabling the formation of particularly stable O-Si-C bonds between the silica support and the organic modifier. The strategies involving the Heck coupling led to the formation of NHPI groups separated from the SiO2 surface by a vinyl linker, while one of the developed modification paths based on the grafting of an appropriate organosilane coupling agent resulted in the active phase devoid of this structural element. The successful course of the synthesis was verified by FTIR and H-1 NMR measurements. Furthermore, the formed materials were examined in terms of their chemical composition (elemental analysis, thermal analysis), structure of surface groups (C-13 NMR, XPS), porosity (low-temperature N-2 adsorption), and tested as catalysts in the aerobic oxidation of p-xylene at atmospheric pressure. The highest conversion and selectivity to p-toluic acid were achieved using the catalyst with enhanced availability of non-hydrolyzed NHPI groups in the pore system. The catalytic stability of the material was additionally confirmed in several subsequent reaction cycles.
  •  
3.
  • Erdélyi, Máté, 1975-, et al. (författare)
  • Halogen Bonding : From Fundamentals to Applications
  • 2021
  • Ingår i: ChemPlusChem. - : John Wiley & Sons. - 2192-6506. ; 86:9, s. 1229-1230
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Guest Editors Maté Erdélyi, Catharine Esterhuysen, and Weilang Zhu introduce the joint Special Collection on Halogen Bonding published by ChemPlusChem and The Chemical Record. This collection is organized in association with the 4th International Symposium on Halogen Bonding (ISXB4) and features top multidisciplinary contributions where halogen bonding plays a pivotal role, including computational, synthetic and catalytic, supramolecular and crystal engineering, and biological investigations and applications. 
  •  
4.
  • Esfandiarfard, Keyhan, et al. (författare)
  • Precursors for the Development of π-Conjugated Low-Coordinate Phosphorus Compounds
  • 2023
  • Ingår i: ChemPlusChem. - : Wiley-VCH Verlagsgesellschaft. - 2192-6506. ; 88:6
  • Tidskriftsartikel (refereegranskat)abstract
    • The synthesis of a novel monomeric precursor and its butadiyne-bridged dimeric form for the preparation of novel π-conjugated organophosphorus compounds is presented. The precursors are synthesized from commercially available starting materials, and based on a Dmp (2,6-dimesitylphenyl) group for kinetic stabilization of the P-functionality, a bromo substituent for the introduction of the phosphorus center, and an acetylene unit at the para position of the Dmp moiety. Such acetylenic units are synthetically versatile, and can be explored for the construction of larger phosphorus-containing π-conjugates. The precursors are utilized to prepare Dmp-stabilized C,C-dibromophosphaalkenes, and butadiyne-bridged dimeric species thereof. The effect of the low-coordinate phosphorus centers and the extent of π-conjugation on the spectroscopic and electronic properties is evaluated by NMR and UV/Vis spectroscopy, as well as cyclic voltammetry. In addition to the phosphaalkenes, the successful syntheses of two new diphosphenes are presented, indicating a broad applicability of the precursor.
  •  
5.
  • Füchtbauer, Anders Foller, 1984, et al. (författare)
  • Lighting Up DNA with the Environment-Sensitive Bright Adenine Analogue qAN4
  • 2020
  • Ingår i: Chempluschem. - : Wiley. - 2192-6506. ; 85:2, s. 319-326
  • Tidskriftsartikel (refereegranskat)abstract
    • The fluorescent adenine analogue qAN4 was recently shown to possess promising photophysical properties, including a high brightness as a monomer. Here we report the synthesis of the phosphoramidite of qAN4 and its successful incorporation into DNA oligonucleotides using standard solid-phase synthesis. Circular dichroism and thermal melting studies indicate that the qAN4-modification has a stabilizing effect on the B-form of DNA. Moreover, qAN4 base-pairs selectively with thymine with mismatch penalties similar to those of mismatches of adenine. The low energy absorption band of qAN4 inside DNA has its peak around 358 nm and the emission in duplex DNA is partly quenched and blue-shifted (ca. 410 nm), compared to the monomeric form. The spectral properties of the fluorophore also show sensitivity to pH; a property that may find biological applications. Quantum yields in single-stranded DNA range from 1-29 % and in duplex DNA from 1-7 %. In combination with the absorptive properties, this gives an average brightness inside duplex DNA of 275 M-1 cm(-1), more than five times higher than the most used environment-sensitive fluorescent base analogue, 2-aminopurine. Finally, we show that qAN4 can be used to advantage as a donor for interbase FRET applications in combination with adenine analogue qA(nitro) as an acceptor.
  •  
6.
  •  
7.
  • Hoffmann, Christian, et al. (författare)
  • Improved Alkyl Glycoside Synthesis by trans-Glycosylation through Tailored Microenvironments of Immobilized β-Glucosidase
  • 2020
  • Ingår i: ChemPlusChem. - : Wiley. - 2192-6506. ; 85:1, s. 137-141
  • Tidskriftsartikel (refereegranskat)abstract
    • We present how the microenvironment can directly improve biocatalytic selectivity of immobilized β-glucosidase. β-Glucosidase from Thermotoga neapolitana was immobilized on a variety of functionalized off-stoichiometric thiol-ene (OSTE) particles, where highest activities were observed for thiol and imidazole functional particles. Compared to the soluble enzyme, the selectivity (rs/rh) between trans-glycosylation of p-nitrophenyl β-D-glucopyranoside (pNPG) with 1-propanol over hydrolysis was increased by a factor of 2–3 using particles containing imidazole (rs/rh of 6.7) and carboxylic acid moieties (rs/rh of 9.2), respectively. These results demonstrate clearly that enzyme selectivity depends directly on the local environment of the enzyme with the support.
  •  
8.
  • Keşan, Gürkan, et al. (författare)
  • Time-Resolved Spectroelectrochemical Dynamics of Carotenoid 8’-apo-β-Carotenal
  • 2023
  • Ingår i: ChemPlusChem. - 2192-6506. ; 88:11
  • Tidskriftsartikel (refereegranskat)abstract
    • This work examines the influence of applied external voltage in bulk electrolysis on the excited-state properties of 8′-apo-β-carotenal in acetonitrile by steady-state and ultrafast time-resolved absorption spectroscopy. The data collected under bulk electrolysis were compared with those taken without applied voltage. The steady-state measurements showed that although intensity of the S0-S2 absorption band varies with the applied voltage, the spectral position remain nearly constant. Comparison of transient absorption spectra shows that the magnitude of the ICT-like band decreases during the experiment under applied voltage condition, and is associated with a prolongation of the S1/ICT-like lifetime from 8 ps to 13 ps. Furthermore, switching off the applied voltage resulted in returning to no-voltage data within about 30 min. Our results show that the amplitude of the signal associated with the ICT state can be tuned by applying an external voltage.
  •  
9.
  • Shameem, Muhammad Anwar, et al. (författare)
  • 1-Phospha-Butadienes and 1H-Phospholes via Alkynylation of Acetylenic Phosphaalkenes
  • 2023
  • Ingår i: ChemPlusChem. - : Wiley-Blackwell. - 2192-6506. ; 88:4
  • Tidskriftsartikel (refereegranskat)abstract
    • Carbon-rich motifs are important building blocks for the fabrication of functional and opto-electronic materials. Electronic tuning can be achieved by alteration of bonding topologies but also via incorporation of heteroelements, for example phosphorus. Herein we present the palladium/copper mediated formation of branched 1-phospha-butadiene derivatives through an unusual alkynylation of a phospha-enyne fragment. Structural and NMR studies provide mechanistic insights into this alkynylation. Furthermore, we disclose a complex cyclisation of the thus obtained 3-yne-1-phosphabutadiene motifs to give highly substituted phosphole derivatives identified by 2D NMR and SC-XRD analysis.
  •  
10.
  • Sharma, Pratigya, et al. (författare)
  • Activation-Induced Surface Modulation of Biowaste-Derived Hierarchical Porous Carbon for Supercapacitors
  • 2022
  • Ingår i: ChemPlusChem. - : John Wiley & Sons. - 2192-6506. ; 87:6
  • Tidskriftsartikel (refereegranskat)abstract
    • Wheat straw-derived carbon from the Wheatbelt region in Western Australia was subjected to chemical activation in an electrolyte containing either acid or base treatment. The findings showed an increase in electron/hole mobility towards the interfaces due to the presence of different surface functional groups such as C-SOx-C and S=C in the carbon framework for acid activation. Likewise, the galvanostatic capacitance measured at a current density of 2 mA cm(-2) in a three-electrode configuration for acid-activated wheat straw exhibited 162 F g(-1), while that for base-activated wheat straw exhibited 106 F g(-1). An increase of 34.5 % more capacitance was achieved for acid-treated wheat straw. This improvement is attributed to the synergistic effects between surface functional groups and electrolyte ions, as well as the electronic structure of the porous electrode.
  •  
11.
  • Ye, Qilun, et al. (författare)
  • Urchin-Like Cobalt-Copper (Hydr)oxides as an Efficient Water Oxidation Electrocatalyst
  • 2020
  • Ingår i: ChemPlusChem. - : Wiley. - 2192-6506. ; 85:6, s. 1339-1346
  • Tidskriftsartikel (refereegranskat)abstract
    • The development of e & xfb03;cient and low-cost oxygen evolution reaction (OER) catalysts is essential for the generation of clean hydrogen energy from water splitting. Herein, a novel hierarchical urchin-like cobalt-copper (hydr)oxide in situ grown on copper foam (CoCuOxHy(S)/CF) was synthesized through the electrochemical transformation of cobalt-copper sulfides (Co9S8-Cu1.81S) via anodization process. This CoCuOxHy(S)/CF anode exhibited a low overpotential (eta) of 274 mV at a current density of 100 mA cm(-2)with a robust durability over a period of 40 h when operated at 10 mA cm(-2). Further investigations imply that the unique nanowires aggregated urchin-like structure of CoCuOxHy(S) derived from the in situ anion exchange process could facilitate the exposure of active sites and accelerate electron transfer. More importantly, the incorporation of copper resulted in an electronic delocalization around the cobalt species, which contributed to reach a high-valent catalytically active cobalt species and further improved the OER performance.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-11 av 11
Typ av publikation
tidskriftsartikel (11)
Typ av innehåll
refereegranskat (10)
övrigt vetenskapligt/konstnärligt (1)
Författare/redaktör
Erdelyi, Mate, 1975 (2)
Orthaber, Andreas, 1 ... (2)
Lindgren, M. (1)
Ahuja, Rajeev, 1965- (1)
Chábera, Pavel (1)
Nilsson, Peter (1)
visa fler...
Grey, Carl (1)
Selegård, Robert (1)
Aili, Daniel (1)
Adlercreutz, Patrick (1)
Grötli, Morten (1)
Ott, Sascha (1)
Sun, Licheng, 1962- (1)
Norman, Patrick (1)
Linares, Mathieu (1)
Wilhelmsson, Marcus, ... (1)
Jaworski, Aleksander ... (1)
Åhlén, Michelle (1)
Polivka, Tomas (1)
Arja, Katriann (1)
Paloncyova, Marketa (1)
Arkhypchuk, Anna I. (1)
Singh, Deobrat (1)
Füchtbauer, Anders F ... (1)
Brown, T. (1)
Gradén, Henrik, 1968 (1)
Hoffmann, Christian (1)
Berniak, Tomasz (1)
Latka, Piotr (1)
Drozdek, Marek (1)
Rokicinska, Anna (1)
Leyva-Perez, Antonio (1)
Kustrowski, Piotr (1)
Bood, Mattias (1)
Gupta, Arvind Kumar (1)
Sarangamath, Sangame ... (1)
Sandberg Wranne, Moa ... (1)
El-Sagheer, A. H. (1)
Gunther, Tyran (1)
Shameem, Muhammad An ... (1)
Lee, Husileng (1)
Esterhuysen, Cathari ... (1)
Zhu, Weiliang (1)
Esfandiarfard, Keyha ... (1)
Wu, Xiujuan (1)
Grad?n, H. (1)
Oka, Kouki (1)
Emanuelsson, Rikard, ... (1)
Hedbom, Daniel, 1983 ... (1)
Yoshino, Haruka (1)
visa färre...
Lärosäte
Uppsala universitet (5)
Kungliga Tekniska Högskolan (2)
Lunds universitet (2)
Göteborgs universitet (1)
Stockholms universitet (1)
Linköpings universitet (1)
visa fler...
Chalmers tekniska högskola (1)
visa färre...
Språk
Engelska (11)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (10)
Teknik (2)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy