A5055975503- Advanced NMR Techniques and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Diatoms and Algae Research
- Covalent Organic Framework Applications
- Zeolite Catalysis and Synthesis
- X-ray Diffraction in Crystallography
- Paleontology and Stratigraphy of Fossils
- Crystallization and Solubility Studies
- NMR spectroscopy and applications
- Magnetism in coordination complexes
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Atomic and Subatomic Physics Research
- Protist diversity and phylogeny
- Chemical Synthesis and Characterization
- Advancements in Battery Materials
- Quantum, superfluid, helium dynamics
- Marine Sponges and Natural Products
- Marine Biology and Environmental Chemistry
- Mesoporous Materials and Catalysis
- Solid-state spectroscopy and crystallography
- Protein Structure and Dynamics
- Analytical Chemistry and Sensors
- Geochemistry and Elemental Analysis
- Luminescence and Fluorescent Materials
Technische Universität Dresden
2016-2025
Bioanalytica (Switzerland)
2023-2025
Robert Bosch (Germany)
2023
Weatherford College
2020
University of Applied Sciences Upper Austria
2019
National Postdoctoral Association
2018
Indian Institute of Chemical Technology
2018
Helmholtz-Zentrum Berlin für Materialien und Energie
2017
University of Regensburg
2001-2016
Utrecht University
2015
Silaffins are uniquely modified peptides that have been implicated in the biogenesis of diatom biosilica. A method avoids harsh anhydrous hydrogen fluoride treatment commonly used to dissolve biosilica allows extraction silaffins their native state. The carry further posttranslational modifications addition polyamine moieties. Each serine residue was phosphorylated, and this high level phosphorylation is essential for biological activity. zwitterionic structure enables formation...
Abstract Highly effective electrocatalysts promoting CO 2 reduction reaction (CO RR) is extremely desirable to produce value-added chemicals/fuels while addressing current environmental challenges. Herein, we develop a layer-stacked, bimetallic two-dimensional conjugated metal-organic framework (2D c -MOF) with copper-phthalocyanine as ligand (CuN 4 ) and zinc-bis(dihydroxy) complex (ZnO linkage (PcCu-O 8 -Zn). The PcCu-O -Zn exhibits high selectivity of 88%, turnover frequency 0.39 s −1...
Abstract Diatoms are eukaryotic, unicellular algae that ubiquitously present in almost any water habitat on earth. dominate phytoplankton populations and algal blooms the oceans. They responsible for about 25 % of world's net primary production. Apart from this ecological significance, diatoms mainly known intricate geometries spectacular patterns their silica‐based cell walls. These species specific. precisely reproduced each generation documenting a genetic control biomineralization...
Abstract A two‐dimensional (2D) sp 2 ‐carbon‐linked conjugated polymer framework (2D CCP‐HATN) has a nitrogen‐doped skeleton, periodical dual‐pore structure and high chemical stability. The backbone consists of hexaazatrinaphthalene (HATN) cyanovinylene units linked entirely by carbon–carbon double bonds. Profiting from the shape‐persistent 2D CCP‐HATN integrated with electrochemical redox‐active HATN robust carbon‐carbon linkage, hybridized carbon nanotubes shows capacity 116 mA h g −1 ,...
π-Conjugated two-dimensional covalent organic frameworks (2D COFs) are emerging as a novel class of electroactive materials for (opto)electronic and chemiresistive sensing applications. However, understanding the intricate interplay between chemistry, structure, conductivity in π-conjugated 2D COFs remains elusive. Here, we report detailed characterization electronic properties two samples consisting Zn- Cu-phthalocyanine-based pyrazine-linked COFs. These synthesized by condensation...
Abstract Organic electrode materials are of long‐standing interest for next‐generation sustainable lithium‐ion batteries (LIBs). As a promising cathode candidate, imide compounds have attracted extensive attention due to their low cost, high theoretical capacity, working voltage, and fast redox reaction. However, the active site utilization electrodes remains challenging them fulfill potential applications. Herein, synthesis highly stable, crystalline 2D polyarylimide (2D‐PAI) integrated...
Dithiine linkage formation via a dynamic and self-correcting nucleophilic aromatic substitution reaction enables the de novo synthesis of porous thianthrene-based two-dimensional covalent organic framework (COF). For first time, this organo-sulfur moiety is integrated as structural building block into crystalline layered COF. The structure new material deviates from typical planar interlayer π-stacking COF to form undulated layers caused by bending along C-S-C bridge, without loss...
2D transition metal carbides and/or nitrides, so-called MXenes, are noted as ideal fast-charging cation-intercalation electrode materials, which nevertheless suffer from limited specific capacities. Herein, it is reported that constructing redox-active phosphorus-oxygen terminals can be an attractive strategy for Nb4 C3 MXenes to remarkably boost their capacities ultrafast Na+ storage. As revealed, with a stoichiometric formula of PO2 - display metaphosphate-like configuration each P atom...
Abstract Two-dimensional conjugated polymers (2DCPs), composed of multiple strands linear with extended in-plane π-conjugation, are emerging crystalline semiconducting for organic (opto)electronics. They represented by two-dimensional π-conjugated covalent frameworks, which typically suffer from poor π-conjugation and thus low charge carrier mobilities. Here we overcome this limitation demonstrating two phthalocyanine-based poly(benzimidazobenzophenanthroline)-ladder-type 2DCPs (2DCP-MPc, M...
Emerging rechargeable aluminium batteries (RABs) offer a sustainable option for next-generation energy storage technologies with low cost and exemplary safety. However, the development of RABs is restricted by limited availability high-performance cathode materials. Herein, we report two polyimide two-dimensional covalent organic frameworks (2D-COFs) cathodes redox-bipolar capability in RAB. The optimal 2D-COF electrode achieves high specific capacity 132 mAh g-1 . Notably, presents...
Inner workings: Diatom cell walls are outstanding examples of natural hybrid materials and exhibit interesting mechanical optical properties. Removal the biosilicates in T. pseudonana with NH4F proves that contain an internal, organic network consisting crosslinked chitin fibers as well other components (see picture). Detailed facts importance to specialist readers published ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted...
Diatom shells (see picture of cell Stephanopyxis turris) contain long-chain polyamines attached either to putrescine or phosphorylated silaffin peptides. These direct the in vitro formation silica nanospheres from silicic acid. The concentration multivalent anions (such as phosphate) defines diameter produced. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2003/z52212_s.pdf author. Please note: publisher not responsible content...
Long-chain polyamines extracted from the highly siliceous cell walls of diatoms are known to precipitate silica nanospheres aqueous, silicic-acid containing solutions at near-neutral pH in vitro. The same is true for synthetic such as polyallylamine. In present contribution we show that microscopic phase separation polyallylamine aqueous solution strictly correlated with precipitation activity polyallylamine/silicic acid solutions. Multivalent anions phosphate or sulfate efficiently induce...
The synthesis and structural flexibility of the metal–organic frameworks M2(2,6-ndc)2(dabco) (DUT-8(M), M = Ni, Co, Cu, Zn; 2,6-ndc 2,6-naphthalenedicarboxylate, dabco 1,4-diazabicyclo[2.2.2]octane) as well their characterization by gas adsorption, 129Xe NMR 13C MAS spectroscopy are described. Depending on integrated metal atom compounds show reversible (DUT-8(Ni), DUT-8(Co)), non-reversible (DUT-8(Zn)) or no (DUT-8(Cu)) transformation upon solvent removal and/or physisorption several gases....
A modular approach for the synthesis of highly ordered porous and chiral auxiliary (Evans auxiliary) decorated metal–organic frameworks is developed. Our strategy, which uses known structures as model materials incorporation chirality via linker modification, can provide access to a wide range suitable enantioselective separation catalysis. Chiral analogues UMCM-1 have been synthesized investigated enantioseparation compounds in liquid phase first promising results are reported.
The synthesis and structure of a new flexible metal–organic framework Ni2(2,6-ndc)2(dabco) (DUT-8(Ni), DUT = Dresden University Technology, 2,6-ndc 2,6-naphthalenedicarboxylate, dabco 1,4-diazabicyclo[2.2.2]octane) as well its characterization by gas adsorption 129Xe NMR spectroscopy is described. compound shows reversible structural transformation without loss crystallinity upon solvent removal physisorption several gases. Xenon studies combined with turn out to be favorable methods for the...
Nuclear Magnetic Resonance (NMR) spectroscopy is a well-established method for the investigation of various types porous materials. During past decade, metal–organic frameworks have attracted increasing research interest. Solid-state NMR has rapidly evolved into an important tool study structure, dynamics and flexibility these materials, as well characterization host–guest interactions with adsorbed species such xenon, carbon dioxide, water, many others. The present review introduces...
Abstract Polymeric semiconductors are emerging as a kind of competitive photocatalysts for hydrogen evolution due to their well‐tunable structures, versatile functionalization, and low‐cost processibility. In this work, series conjugated porous polymers with substantial cyano‐substituted fully sp 2 ‐carbon frameworks efficiently synthesized by using electron‐deficient tricyanomesitylene key building block promote an organic base‐catalyzed Knoevenagel condensation various aldehyde‐substituted...