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  1. Article ; Online: Reactivity of FeMoO

    Weber, Anna K / Panthöfer, Martin / Möller, Angela

    Inorganic chemistry

    2022  Volume 61, Issue 26, Page(s) 10108–10115

    Abstract: The reactivity of ... ...

    Abstract The reactivity of FeMoO
    Language English
    Publishing date 2022-06-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1484438-2
    ISSN 1520-510X ; 0020-1669
    ISSN (online) 1520-510X
    ISSN 0020-1669
    DOI 10.1021/acs.inorgchem.2c01195
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Lithium confinement and dynamics in hexagonal and monoclinic tungsten oxide nanocrystals: a

    Dören, René / Panthöfer, Martin / Prädel, Leon / Tremel, Wolfgang / Mondeshki, Mihail

    Nanoscale

    2022  Volume 14, Issue 41, Page(s) 15348–15363

    Abstract: Mixed-valence tungsten bronzes ... ...

    Abstract Mixed-valence tungsten bronzes A
    Language English
    Publishing date 2022-10-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d2nr02492f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Magneli-type tungsten oxide nanorods as catalysts for the selective oxidation of organic sulfides.

    Dören, René / Hartmann, Jens / Leibauer, Benjamin / Panthöfer, Martin / Mondeshki, Mihail / Tremel, Wolfgang

    Dalton transactions (Cambridge, England : 2003)

    2021  Volume 50, Issue 39, Page(s) 14027–14037

    Abstract: Selective oxidation of thioethers is an important reaction to obtain sulfoxides as synthetic intermediates for applications in the chemical industry, medicinal chemistry and biology or the destruction of warfare agents. The reduced Magneli-type tungsten ... ...

    Abstract Selective oxidation of thioethers is an important reaction to obtain sulfoxides as synthetic intermediates for applications in the chemical industry, medicinal chemistry and biology or the destruction of warfare agents. The reduced Magneli-type tungsten oxide WO
    MeSH term(s) Oxides ; Tungsten
    Chemical Substances Oxides ; tungsten oxide (940E10M08M) ; Tungsten (V9306CXO6G)
    Language English
    Publishing date 2021-10-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d1dt02243a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Panchromatic Absorption and Oxidation of an Iron(II) Spin Crossover Complex.

    Moll, Johannes / Förster, Christoph / König, Alexandra / Carrella, Luca M / Wagner, Manfred / Panthöfer, Martin / Möller, Angela / Rentschler, Eva / Heinze, Katja

    Inorganic chemistry

    2022  Volume 61, Issue 3, Page(s) 1659–1671

    Abstract: In order to expand and exploit the useful properties of ... ...

    Abstract In order to expand and exploit the useful properties of d
    Language English
    Publishing date 2022-01-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1484438-2
    ISSN 1520-510X ; 0020-1669
    ISSN (online) 1520-510X
    ISSN 0020-1669
    DOI 10.1021/acs.inorgchem.1c03511
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Mixed Ligand Shell Formation upon Catechol Ligand Adsorption on Hydrophobic TiO2 Nanoparticles

    Schechtel, Eugen / Dören, René / Frerichs, Hajo / Mondeshki, Mihail / Panthöfer, Martin / Tremel, Wolfgang

    Langmuir. 2019 Sept. 05, v. 35, no. 38

    2019  

    Abstract: Modifying the surfaces of metal oxide nanoparticles (NPs) with monolayers of ligands provides a simple and direct method to generate multifunctional coatings by altering their surface properties. This works best if the composition of the monolayers can ... ...

    Abstract Modifying the surfaces of metal oxide nanoparticles (NPs) with monolayers of ligands provides a simple and direct method to generate multifunctional coatings by altering their surface properties. This works best if the composition of the monolayers can be controlled. Mussel-inspired, noninnocent catecholates stand out from other ligands like carboxylates and amines because they are redox-active and allow for highly efficient surface binding and enhanced electron transfer to the surface. However, a comprehensive understanding of their surface chemistry, including surface coverage and displacement of the native ligand, is still lacking. Here, we unravel the displacement of oleate (OA) ligands on hydrophobic, OA-stabilized TiO2 NPs by catecholate ligands using a combination of one- and two-dimensional nuclear magnetic resonance (NMR) spectroscopy techniques. Conclusive pictures of the ligand shells before and after surface modification with catecholate were obtained by 1H and 13C NMR spectroscopy (the 13C chemical shift being more sensitive and with a broader range). The data could be explained using a Langmuir-type approach. Gradual formation of a mixed ligand shell was observed, and the surface processes of catecholate adsorption and OA desorption were quantified. Contrary to the prevailing view, catecholate displaces only a minor fraction (∼20%) of the native OA ligand shell. At the same time, the total ligand density more than doubled from 2.3 nm–2 at native oleate coverage to 4.8 nm–2 at maximum catecholate loading. We conclude that the catecholate ligand adsorbs preferably to unoccupied Ti surface sites rather than replacing native OA ligands. This unexpected behavior, reminiscent of the Vroman effect for protein corona formation, appears to be a fundamental feature in the widely used surface modification of hydrophobic metal oxide NPs with catecholate ligands. Moreover, our findings show that ligand displacement on OA-capped TiO2 NPs is not suited for a full ligand shell refunctionalization because it produces only mixed ligand shells. Therefore, our results contribute to a better understanding and performance of photocatalytic applications based on catecholate ligand-sensitized TiO2 NPs.
    Keywords adsorption ; amines ; carbon ; catechol ; coatings ; desorption ; electron transfer ; hydrophobicity ; ligands ; nanoparticles ; nuclear magnetic resonance spectroscopy ; oleic acid ; photocatalysis ; protein corona ; stable isotopes ; titanium dioxide
    Language English
    Dates of publication 2019-0905
    Size p. 12518-12531.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.9b02496
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: Gram-scale selective synthesis of WO

    Dören, René / Leibauer, Benjamin / Lange, Martin Alexander / Schechtel, Eugen / Prädel, Leon / Panthöfer, Martin / Mondeshki, Mihail / Tremel, Wolfgang

    Nanoscale

    2021  Volume 13, Issue 17, Page(s) 8146–8162

    Abstract: Localized surface plasmon resonance properties in unconventional materials like metal oxides or chalcogenide semiconductors have been studied for use in signal detection and analysis in biomedicine and photocatalysis. We devised a selective synthesis of ... ...

    Abstract Localized surface plasmon resonance properties in unconventional materials like metal oxides or chalcogenide semiconductors have been studied for use in signal detection and analysis in biomedicine and photocatalysis. We devised a selective synthesis of the tungsten oxides WO
    Language English
    Publishing date 2021-04-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d0nr09055g
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Mixed Ligand Shell Formation upon Catechol Ligand Adsorption on Hydrophobic TiO

    Schechtel, Eugen / Dören, René / Frerichs, Hajo / Panthöfer, Martin / Mondeshki, Mihail / Tremel, Wolfgang

    Langmuir : the ACS journal of surfaces and colloids

    2019  Volume 35, Issue 38, Page(s) 12518–12531

    Abstract: Modifying the surfaces of metal oxide nanoparticles (NPs) with monolayers of ligands provides a simple and direct method to generate multifunctional coatings by altering their surface properties. This works best if the composition of the monolayers can ... ...

    Abstract Modifying the surfaces of metal oxide nanoparticles (NPs) with monolayers of ligands provides a simple and direct method to generate multifunctional coatings by altering their surface properties. This works best if the composition of the monolayers can be controlled. Mussel-inspired, noninnocent catecholates stand out from other ligands like carboxylates and amines because they are redox-active and allow for highly efficient surface binding and enhanced electron transfer to the surface. However, a comprehensive understanding of their surface chemistry, including surface coverage and displacement of the native ligand, is still lacking. Here, we unravel the displacement of oleate (OA) ligands on hydrophobic, OA-stabilized TiO
    Language English
    Publishing date 2019-09-12
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.9b02496
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: High-throughput synthesis of CeO

    Sarif, Massih / Jegel, Olga / Gazanis, Athanasios / Hartmann, Jens / Plana-Ruiz, Sergi / Hilgert, Jan / Frerichs, Hajo / Viel, Melanie / Panthöfer, Martin / Kolb, Ute / Tahir, Muhammad Nawaz / Schemberg, Jörg / Kappl, Michael / Heermann, Ralf / Tremel, Wolfgang

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 3935

    Abstract: Preventing bacteria from adhering to material surfaces is an important technical problem and a major cause of infection. One of nature's defense strategies against bacterial colonization is based on the biohalogenation of signal substances that interfere ...

    Abstract Preventing bacteria from adhering to material surfaces is an important technical problem and a major cause of infection. One of nature's defense strategies against bacterial colonization is based on the biohalogenation of signal substances that interfere with bacterial communication. Biohalogenation is catalyzed by haloperoxidases, a class of metal-dependent enzymes whose activity can be mimicked by ceria nanoparticles. Transparent CeO
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Bacteria ; Biofilms ; Nanocomposites ; Nanoparticles ; Pseudomonas aeruginosa ; Pyocyanine ; Quorum Sensing ; Virulence Factors
    Chemical Substances Anti-Bacterial Agents ; Virulence Factors ; Pyocyanine (9OQM399341)
    Language English
    Publishing date 2022-03-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-07833-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Nanocomposite antimicrobials prevent bacterial growth through the enzyme-like activity of Bi-doped cerium dioxide (Ce

    Frerichs, Hajo / Pütz, Eva / Pfitzner, Felix / Reich, Tobias / Gazanis, Athanasios / Panthöfer, Martin / Hartmann, Jens / Jegel, Olga / Heermann, Ralf / Tremel, Wolfgang

    Nanoscale

    2020  Volume 12, Issue 41, Page(s) 21344–21358

    Abstract: Preventing bacterial adhesion on materials surfaces is an important problem in marine, industrial, medical and environmental fields and a topic of major medical and societal importance. A defense strategy of marine organisms against bacterial ... ...

    Abstract Preventing bacterial adhesion on materials surfaces is an important problem in marine, industrial, medical and environmental fields and a topic of major medical and societal importance. A defense strategy of marine organisms against bacterial colonization relies on the biohalogenation of signaling compounds that interfere with bacterial communication. These reactions are catalyzed by haloperoxidases, a class of metal-dependent enzymes, whose activity can be emulated by ceria nanoparticles. The enzyme-like activity of ceria was enhanced by a factor of 3 through bismuth substitution (Ce1-xBixO2-δ). The solubility of Bi3+ in CeO2 is confined to the range 0 < x < 0.25 under quasi-hydrothermal conditions. The Bi3+ cations are located close to the nanoparticle surface because their ionic radii are larger than those of the tetravalent Ce4+ ions. The synthesis of Ce1-xBixO2-δ (0 < x < 0.25) nanoparticles was upscaled to yields of ∼50 g. The halogenation activity of Ce1-xBixO2-δ was demonstrated with phenol red assays. The maximum activity for x ≈ 0.2 is related to the interplay of the ζ-potential of surface-engineered Ce1-xBixO2-δ nanoparticles and their BET surface area. Ce0.80Bi0.20O1.9 nanoparticles with optimized activity were incorporated in polyethersulfone beads, which are typical constituents of water filter membrane supports. Although Ce1-xBixO2-δ nanoparticles are not bactericidal on their own, naked Ce1-xBixO2-δ nanoparticles and polyethersulfone/Ce1-xBixO2-δ nanocomposites showed a strongly reduced bacterial coverage. We attribute the decreased adhesion of the Gram-negative soil bacterium Pseudomonas aeruginosa and of Phaeobacter gallaeciensis, a primary bacterial colonizer in marine biofilms, to the formation of halogenated signaling compounds. No biocides are needed, H2O2 (formed in daylight) and halide are the only substrates required. The haloperoxidase-like activity of Ce1-xBixO2-δ may be a promising starting point for the development of environmentally friendly, "green" nanocomposites, when the use of conventional biocides is prohibited.
    MeSH term(s) Anti-Infective Agents ; Cerium ; Hydrogen Peroxide ; Nanocomposites ; Rhodobacteraceae
    Chemical Substances Anti-Infective Agents ; Cerium (30K4522N6T) ; ceric oxide (619G5K328Y) ; Hydrogen Peroxide (BBX060AN9V)
    Language English
    Publishing date 2020-09-29
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d0nr06165d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Trapping Amorphous Intermediates of Carbonates - A Combined Total Scattering and NMR Study.

    Leukel, Sebastian / Panthöfer, Martin / Mondeshki, Mihail / Kieslich, Gregor / Wu, Yue / Krautwurst, Nina / Tremel, Wolfgang

    Journal of the American Chemical Society

    2018  Volume 140, Issue 44, Page(s) 14638–14646

    Abstract: Crystallization via metastable phases plays an important role in chemical manufacturing, biomineralization, and protein crystallization, but the kinetic pathways leading from metastable phases to the stable crystalline modifications are not well ... ...

    Abstract Crystallization via metastable phases plays an important role in chemical manufacturing, biomineralization, and protein crystallization, but the kinetic pathways leading from metastable phases to the stable crystalline modifications are not well understood. In particular, the fast crystallization of amorphous intermediates makes a detailed characterization challenging. To circumvent this problem, we devised a system that allows trapping and stabilizing the amorphous intermediates of representative carbonates (calcium, strontium, barium, manganese, and cadmium). The long-term stabilization of these transient species enabled a detailed investigation of their composition, structure, and morphology. Total scattering experiments with high-energy synchrotron radiation revealed a short-range order of several angstroms in all amorphous intermediates. From the synchrotron data, a structural model of amorphous calcium carbonate was derived that indicates a lower coordination number of calcium compared to the crystalline polymorphs. Our study shows that a multistep crystallization pathway via amorphous intermediates is open to many carbonates. We could isolate and characterize these transient species, thereby providing new insights into their crystallization mechanism.
    Language English
    Publishing date 2018-10-24
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.8b06703
    Database MEDical Literature Analysis and Retrieval System OnLINE

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