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  1. Artikel ; Online: Synthesis and Characterization of Phosphorus-Containing Isocyclam Macrocycles and Their Nickel Complexes.

    Gerschel, Philipp / Guseva, Tatiana / Siegmund, Daniel / Apfel, Ulf-Peter

    The Journal of organic chemistry

    2022  

    Abstract: The tetradentate azamacrocycle cyclam (=1,4,8,11-tetraazacyclotetradecane) was studied profoundly for the coordination of transition metal ions, and the resulting complexes were investigated extensively for their catalytic performance in, e.g., ... ...

    Abstract The tetradentate azamacrocycle cyclam (=1,4,8,11-tetraazacyclotetradecane) was studied profoundly for the coordination of transition metal ions, and the resulting complexes were investigated extensively for their catalytic performance in, e.g., O
    Sprache Englisch
    Erscheinungsdatum 2022-11-30
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.2c02049
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Electroplated Electrodes for Continuous and Mass-Efficient Electrochemical Hydrogenation.

    Wolf, Jonas / Pellumbi, Kevinjeorjios / Haridas, Sarankumar / Kull, Tobias / Kleinhaus, Julian T / Wickert, Leon / Apfel, Ulf-Peter / Siegmund, Daniel

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2024  Band 30, Heft 18, Seite(n) e202303808

    Abstract: Electrocatalytic hydrogenations (ECH) enable the reduction of organic substrates upon usage of electric current and present a sustainable alternative to conventional processes if green electricity is used. Opposed to most current protocols for electrode ... ...

    Abstract Electrocatalytic hydrogenations (ECH) enable the reduction of organic substrates upon usage of electric current and present a sustainable alternative to conventional processes if green electricity is used. Opposed to most current protocols for electrode preparation, this work presents a one-step binder- and additive-free production of silver- and copper-electroplated electrodes. Controlled adjustment of the preparation parameters allows for the tuning of catalyst morphology and its electrochemical properties. Upon optimization of the deposition protocol and carbon support, high faradaic efficiencies of 93 % for the ECH of the Vitamin A- and E-synthon 2-methyl-3-butyn-2-ol (MBY) are achieved that can be maintained at current densities of 240 mA cm
    Sprache Englisch
    Erscheinungsdatum 2024-02-09
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.202303808
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: An asymmetric cryptand for the site-specific coordination of 3d metals in multiple oxidation states.

    Jökel, Julia / Nyßen, Frauke / Siegmund, Daniel / Apfel, Ulf-Peter

    Dalton transactions (Cambridge, England : 2003)

    2021  Band 50, Heft 41, Seite(n) 14602–14610

    Abstract: Bis-tren (tren = tris(2-aminoethyl)amine) azacryptands were previously studied profoundly for the coordination of two +II metals and subsequent binding of substrates within their cavity. Likewise, cryptates including metals in different oxidations states ...

    Abstract Bis-tren (tren = tris(2-aminoethyl)amine) azacryptands were previously studied profoundly for the coordination of two +II metals and subsequent binding of substrates within their cavity. Likewise, cryptates including metals in different oxidations states were reported with the rather unstable hexa-imine analogues but also revealed only little stability. In this work, we report the synthesis of an asymmetric hexa-amine cryptand analogue by selectively exchanging three of the secondary amines of one binding site with sulphur atoms. We show that the presence of two distinct binding sites allows for the selective formation of stable dinuclear complexes of metals with different oxidation numbers and present the formation of distinct Cu
    Sprache Englisch
    Erscheinungsdatum 2021-10-26
    Erscheinungsland England
    Dokumenttyp 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/d1dt02075g
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: Trimetallic Pentlandites (Fe,Co,Ni)

    Smialkowski, Mathias / Siegmund, Daniel / Stier, Kenta / Hensgen, Lars / Checinski, Marek P / Apfel, Ulf-Peter

    ACS materials Au

    2022  Band 2, Heft 4, Seite(n) 474–481

    Abstract: Recently, pentlandite materials have been shown to exhibit promising properties with respect to the hydrogen evolution reaction (HER). A whole series of trimetallic FeCoNi-pentlandite materials and composites have been synthesized from the elements using ...

    Abstract Recently, pentlandite materials have been shown to exhibit promising properties with respect to the hydrogen evolution reaction (HER). A whole series of trimetallic FeCoNi-pentlandite materials and composites have been synthesized from the elements using high-temperature synthesis and categorized in terms of purity. Furthermore, the electrocatalytic properties regarding the HER were determined and correlated to hydrogen adsorption energies, which were determined by means of density functional theory (DFT) calculations. The relationships between activity and its origin generated in this way help to better understand the pentlandite system and provide meaningful approaches for catalyst synthesis.
    Sprache Englisch
    Erscheinungsdatum 2022-04-27
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 2694-2461
    ISSN (online) 2694-2461
    DOI 10.1021/acsmaterialsau.2c00016
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Buch ; Artikel ; Online: Medicinal organometallic chemistry

    Siegmund, Daniel / Metzler-Nolte, Nils

    2020  

    Abstract: ... S.319- ... ...

    Abstract S.319-350
    Schlagwörter chemistry ; organic chemistry
    Sprache Englisch
    Erscheinungsland de
    Dokumenttyp Buch ; Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Artikel ; Online: Developing electrochemical hydrogenation towards industrial application.

    Kleinhaus, Julian T / Wolf, Jonas / Pellumbi, Kevinjeorjios / Wickert, Leon / Viswanathan, Sangita C / Junge Puring, Kai / Siegmund, Daniel / Apfel, Ulf-Peter

    Chemical Society reviews

    2023  Band 52, Heft 21, Seite(n) 7305–7332

    Abstract: Electrochemical hydrogenation reactions gained significant attention as a sustainable and efficient alternative to conventional thermocatalytic hydrogenations. This tutorial review provides a comprehensive overview of the basic principles, the practical ... ...

    Abstract Electrochemical hydrogenation reactions gained significant attention as a sustainable and efficient alternative to conventional thermocatalytic hydrogenations. This tutorial review provides a comprehensive overview of the basic principles, the practical application, and recent advances of electrochemical hydrogenation reactions, with a particular emphasis on the translation of these reactions from lab-scale to industrial applications. Giving an overview on the vast amount of conceivable organic substrates and tested catalysts, we highlight the challenges associated with upscaling electrochemical hydrogenations, such as mass transfer limitations and reactor design. Strategies and techniques for addressing these challenges are discussed, including the development of novel catalysts and the implementation of scalable and innovative cell concepts. We furthermore present an outlook on current challenges, future prospects, and research directions for achieving widespread industrial implementation of electrochemical hydrogenation reactions. This work aims to provide beginners as well as experienced electrochemists with a starting point into the potential future transformation of electrochemical hydrogenations from a laboratory curiosity to a viable technology for sustainable chemical synthesis on an industrial scale.
    Sprache Englisch
    Erscheinungsdatum 2023-10-30
    Erscheinungsland England
    Dokumenttyp Journal Article ; Review
    ZDB-ID 1472875-8
    ISSN 1460-4744 ; 0306-0012
    ISSN (online) 1460-4744
    ISSN 0306-0012
    DOI 10.1039/d3cs00419h
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel: Mechanochemical one-pot synthesis of heterostructured pentlandite-carbon composites for the hydrogen evolution reaction.

    Tetzlaff, David / Rensch, Tilo / Messing, Leonard / Banke, Petra / Grätz, Sven / Siegmund, Daniel / Borchardt, Lars / Apfel, Ulf-Peter

    Chemical science

    2023  Band 14, Heft 42, Seite(n) 11790–11797

    Abstract: We have utilized carbon sources as milling additives to enable a direct mechanochemical one-pot synthesis of ... ...

    Abstract We have utilized carbon sources as milling additives to enable a direct mechanochemical one-pot synthesis of Fe
    Sprache Englisch
    Erscheinungsdatum 2023-09-29
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2559110-1
    ISSN 2041-6539 ; 2041-6520
    ISSN (online) 2041-6539
    ISSN 2041-6520
    DOI 10.1039/d3sc04542k
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  8. Artikel ; Online: Enhancing the CO

    Pellumbi, Kevinjeorjios / Smialkowski, Mathias / Siegmund, Daniel / Apfel, Ulf-Peter

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2020  Band 26, Heft 44, Seite(n) 9938–9944

    Abstract: The electrochemical reduction of ... ...

    Abstract The electrochemical reduction of CO
    Sprache Englisch
    Erscheinungsdatum 2020-07-08
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.202001289
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel ; Online: Electrochemical Hydrogenation of Aliphatic Aldehydes and Acids using Pentlandite Catalysts

    Kleinhaus, Julian T. / Umer, Salman / Pellumbi, Kevinjeorjios / Wickert, Leon / Wolf, Jonas / junge Puring, Kai / Siegmund, Daniel / Apfel, Ulf-Peter

    2024  

    Abstract: Electrochemical hydrogenations are considered a sustainable alternative to classical thermocatalytic processes prevalent in industrial conversions. Using a base metal sulfide of the pentlandite class, the hydrogenation of glutaraldehyde and propionic ... ...

    Abstract Electrochemical hydrogenations are considered a sustainable alternative to classical thermocatalytic processes prevalent in industrial conversions. Using a base metal sulfide of the pentlandite class, the hydrogenation of glutaraldehyde and propionic acid was investigated. While propionic acid could not be converted, glutaraldehyde was conveniently transformed to the semi- and fully hydrogenated products 5-hydroxypentanal and 1,5-pentanediol with a partial current density of up to 34 mA cm-2 and a Faraday efficiency of 34 %. Crucial factors for a stable and efficient reaction were found to be the use of an appropriate buffer, avoidance of low pH and the used membrane type. The reaction was implemented into a zero-gap cell reaching a single pass conversion of up to 22 %, underlining the potential for future application.

    Online First
    Schlagwörter Aldehyde ; Carboxylic Acids ; Diol ; Electrochemical hydrogenation ; pentlandite
    Thema/Rubrik (Code) 660
    Sprache Englisch
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  10. Artikel ; Online: Electroplated electrodes for continuous and mass-efficient electrochemical hydrogenation

    Wolf, Jonas / Pellumbi, Kevinjeorjios / Haridas, Sarankumar / Kull, Tobias / Kleinhaus, Julian T. / Wickert, Leon / Apfel, Ulf-Peter / Siegmund, Daniel

    2024  

    Abstract: Electrocatalytic hydrogenations (ECH) enable the reduction of organic substrates upon usage of electric current and present a sustainable alternative to conventional processes if green electricity is used. Opposed to most current protocols for electrode ... ...

    Abstract Electrocatalytic hydrogenations (ECH) enable the reduction of organic substrates upon usage of electric current and present a sustainable alternative to conventional processes if green electricity is used. Opposed to most current protocols for electrode preparation, this work presents a one-step binder- and additive-free production of silver- and copper-electroplated electrodes. Controlled adjustment of the preparation parameters allows for the tuning of catalyst morphology and its electrochemical properties. Upon optimization of the deposition protocol and carbon support, high faradaic efficiencies of 93 % for the ECH of the Vitamin A- and E-synthon 2-methyl-3-butyn-2-ol (MBY) are achieved that can be maintained at current densities of 240 mA cm-2 and minimal catalyst loadings of 0.2 mg cm-2, corresponding to an unmatched production rate of 1.47 kgMBE gcat-1 h-1. For a continuous hydrogenation process, the protocol can be directly transferred into a single-pass operation mode giving a production rate of 1.38 kgMBE gcat-1 h-1. Subsequently, the substrate spectrum was extended to a total of 17 different C-C-, C-O- and N-O-unsaturated compounds revealing the general applicability of the reported process. Our results lay an important groundwork for the development of electrochemical reactors and electrodes able to directly compete with the palladium-based thermocatalytic state of the art.

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    Schlagwörter Electrocatalytic ; green energy industries
    Thema/Rubrik (Code) 660
    Sprache Englisch
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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