9 results on '"Grzegorz Markiewicz"'
Search Results
2. Generation of Low-Dimensional Architectures through the Self-Assembly of Pyromellitic Diimide Derivatives
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Marcin Hoffmann, Grzegorz Markiewicz, Chiara Musumeci, Zbigniew Hnatejko, Roman Świetlik, Wojciech Jankowski, Monika Wałęsa-Chorab, Violetta Patroniak, Paolo Samorì, Adam Gorczyński, Andrzej Bogucki, Artur R. Stefankiewicz, Artur Ciesielski, Emanuele Orgiu, Institut de Science et d'ingénierie supramoléculaires (ISIS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Adam Mickiewicz University in Poznań (UAM), Polish Academy of Sciences (PAN), and univOAK, Archive ouverte
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Infrared ,General Chemical Engineering ,Supramolecular chemistry ,Stacking ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Article ,lcsh:Chemistry ,symbols.namesake ,Side chain ,Molecule ,Non-covalent interactions ,chemistry.chemical_classification ,[CHIM.MATE] Chemical Sciences/Material chemistry ,Chemistry ,General Chemistry ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,Pyromellitic diimide ,0104 chemical sciences ,lcsh:QD1-999 ,symbols ,van der Waals force ,0210 nano-technology - Abstract
International audience; Small π-conjugated molecules can be designed and synthesized to undergo controlled self-assembly forming low-dimensional architectures, with programmed order at the supramolecular level. Such order is of paramount importance because it defines the property of the obtained material. Here, we have focused our attention to four pyromellitic diimide derivatives exposing different types of side chains. The joint effect of different noncovalent interactions including π–π stacking, H-bonding, and van der Waals forces on the four derivatives yielded different self-assembled architectures. Atomic force microscopy studies, corroborated with infrared and nuclear magnetic resonance spectroscopic measurements, provided complementary multiscale insight into these assemblies.
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- 2017
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3. Self-organization of amino-acid-derived NDI assemblies into a nanofibrillar superstructure with humidity sensitive n-type semiconducting properties
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Anna Walczak, Artur R. Stefankiewicz, Artur Ciesielski, Marco A. Squillaci, Paolo Samorì, and Grzegorz Markiewicz
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chemistry.chemical_classification ,Materials science ,Atomic force microscopy ,Metals and Alloys ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Nuclear magnetic resonance spectroscopy ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Amino acid ,Supramolecular polymers ,Crystallography ,chemistry ,Polymerization ,Materials Chemistry ,Ceramics and Composites ,0210 nano-technology ,Superstructure (condensed matter) - Abstract
The hierarchical self-assembly of l-tyrosine substituted naphthalenediimide has been explored in solution by NMR spectroscopy and in the solid-state by atomic force microscopy. Spontaneous non-covalent polymerisation led to the formation of a three-dimensional fibre-like supramolecular polymer with n-type semiconducting properties.
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- 2017
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4. Photoisomerisation and light-induced morphological switching of a polyoxometalate–azobenzene hybrid
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Artur R. Stefankiewicz, Artur Ciesielski, Violetta Patroniak, Agostino Galanti, Grzegorz Markiewicz, Paolo Samorì, and Dawid Pakulski
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Materials science ,Absorption spectroscopy ,Scanning electron microscope ,Metals and Alloys ,Cationic polymerization ,Ionic bonding ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,Dynamic light scattering ,Azobenzene ,chemistry ,Polyoxometalate ,Materials Chemistry ,Ceramics and Composites ,Surface modification ,0210 nano-technology - Abstract
The functionalization of a spherical Keplerate-type polyoxometalate {Mo72V30} with a cationic azobenzene surfactant has been achieved through ionic self-assembly. The photoisomerisation reaction of this complex, which emerges in a light-triggered aggregation–disaggregation process, has been followed by 1H NMR spectroscopy, dynamic light scattering, absorption spectroscopy and scanning electron microscopy analyses.
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- 2017
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5. The Influence of Mucin-Based Artificial Saliva on Properties of Polycaprolactone and Polylactide
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Grzegorz Markiewicz, Joanna Mystkowska, Robert Bucki, Piotr Deptuła, and Dawid Łysik
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Saliva ,Polymers and Plastics ,02 engineering and technology ,macromolecular substances ,mechanical properties ,010402 general chemistry ,01 natural sciences ,Article ,chemistry.chemical_compound ,Differential scanning calorimetry ,Polymer degradation ,stomatognathic system ,Ultimate tensile strength ,medicine ,degradation ,chemistry.chemical_classification ,saliva ,Chemistry ,thermal properties ,technology, industry, and agriculture ,molecular weight ,General Chemistry ,Polymer ,021001 nanoscience & nanotechnology ,equipment and supplies ,Biodegradable polymer ,0104 chemical sciences ,Chemical engineering ,Polycaprolactone ,Swelling ,medicine.symptom ,activation energy of thermal decomposition ,0210 nano-technology - Abstract
Polycaprolactone (PCL) and polylactide (PLA) are the two most common biodegradable polymers with potential use in oral applications. Both polymers undergo mainly slow hydrolytic degradation in the human body. However, specific conditions of the oral cavity, like elevated temperature, low pH, and presence of saliva affect the rate of hydrolysis. The study examined the properties of solid samples of PCL and PLA subjected to degradation in phosphate buffered saline (PBS) and artificial saliva (AS) at temperatures of 37 or 42 °, C, and pH values 2 or 7.4. A number of tests were performed, including measurement of the degree of swelling, weight loss, molecular weight, differential scanning calorimetry, and thermogravimetry of polymers, as well as hardness and tensile strength. Additionally, topography and stiffness of surfaces using atomic force microscopy are presented. It has been noticed that in the artificial saliva, the processes of polymer degradation occur slightly more slowly, and the effects of temperature and pH are less pronounced. We believe that a layer of porcine gastric mucin from artificial saliva that adsorbed on the surface of polymers may have a key role in the observed differences, this layer resembles protective mucin coating tissues in the oral cavity.
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- 2019
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6. Steering the Self‐Assembly Outcome of a Single NDI Monomer into Three Morphologically Distinct Supramolecular Assemblies, with Concomitant Change in Supramolecular Polymerization Mechanism
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Artur R. Stefankiewicz, Grzegorz Markiewicz, and Maarten M. J. Smulders
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General Chemical Engineering ,Stacking ,Supramolecular chemistry ,General Physics and Astronomy ,Medicine (miscellaneous) ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,chemistry.chemical_compound ,General Materials Science ,Solubility ,lcsh:Science ,supramolecular polymers ,VLAG ,chemistry.chemical_classification ,Isodesmic reaction ,Full Paper ,Organic Chemistry ,General Engineering ,nonequilibrium assemblies ,self‐assembly mechanism ,Polymer ,noncovalent self-assembly ,Full Papers ,021001 nanoscience & nanotechnology ,Organische Chemie ,noncovalent self‐assembly ,0104 chemical sciences ,Supramolecular polymers ,Monomer ,chemistry ,Polymerization ,Chemical engineering ,naphthalene diimides ,lcsh:Q ,0210 nano-technology ,self-assembly mechanism - Abstract
Noncovalent self‐assembly creates an effective route to highly sophisticated supramolecular polymers with tunable properties. However, the outcome of this assembly process is highly dependent on external conditions. In this work, a monomeric naphthalene diimide (NDI), designed to allow solubility in a wide range of solvents, can assemble into three distinct noncovalent supramolecular species depending on solvent composition and temperature. Namely, while the self‐assembly in chlorinated solvents yields relatively short, hydrogen‐bonded nanotubes, the reduction of solvent polarity changes the assembly outcome, yielding π–π stacking polymers, which can further bundle into a more complex aggregate. The obtained polymers differ not only in their global morphology but—more strikingly—also in the thermodynamics and kinetics of their supramolecular self‐assembly, involving isodesmic or two‐stage cooperative assembly with kinetic hysteresis, respectively. Ultimately, three distinct assembly states can be accessed in a single experiment.
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- 2019
7. Photoswitchable transition metal complexes with azobenzene-functionalized imine-based ligands: structural and kinetic analysis
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Anna Walczak, Magdalena Piasecka, Grzegorz Markiewicz, Jack Harrowfield, Artur R. Stefankiewicz, and Filip Perlitius
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Photoisomerization ,010405 organic chemistry ,Metal ions in aqueous solution ,Imine ,010402 general chemistry ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,Reaction rate ,chemistry.chemical_compound ,chemistry ,Transition metal ,Azobenzene ,Irradiation ,Cis–trans isomerism - Abstract
We report on the characterization of two imine type ligands containing photoresponsive azobenzene units as side groups and their transition metal ions complexes. The ligands, both free and in their complexes undergo trans- > cis photoisomerization after irradiation with UV light, but binding of metal ions reduces both the photoisomerisation reaction rates and cis isomer concentrations in the photostationary states. The greatest diminution in the photoisomerisation rate was observed for the complex containing Cd(II), the heaviest among the various transition metal ions tested in this study.
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- 2018
8. Generation and transformation of a hemi-iminal-based metal-organic Fe(ii) structure obtained via subcomponent self-assembly in water
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Ewa A. Połomska, Artur R. Stefankiewicz, Jack Harrowfield, Grzegorz Markiewicz, Anna Walczak, and Miłosz Piechocki
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Inorganic Chemistry ,Metal ,Crystallography ,010405 organic chemistry ,Ligand ,Chemistry ,visual_art ,visual_art.visual_art_medium ,Self-assembly ,010402 general chemistry ,01 natural sciences ,Redox ,0104 chemical sciences - Abstract
We report the synthesis and characterization of a coordination architecture with a Fe(II) center obtained by subcomponent self-assembly in water. The complex is based on very rare hemi-iminal ligands spontaneously generated from commercially available materials. The complex can be further transformed into another species by oxidation reaction of both the metal center and organic ligand.
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- 2017
9. Selective C70 encapsulation by a robust octameric nanospheroid held together by 48 cooperative hydrogen bonds
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Michał Kołodziejski, Julian J. Holstein, Anna Jenczak, Artur R. Stefankiewicz, Jeremy K. M. Sanders, and Grzegorz Markiewicz
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Binding function ,chemistry.chemical_classification ,Multidisciplinary ,Fullerene ,010405 organic chemistry ,Chemistry ,Hydrogen bond ,Internal cavity ,Science ,Supramolecular chemistry ,General Physics and Astronomy ,Nanotechnology ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Combinatorial chemistry ,General Biochemistry, Genetics and Molecular Biology ,Article ,0104 chemical sciences ,Amino acid ,Enantiopure drug ,Molecule - Abstract
Self-assembly of multiple building blocks via hydrogen bonds into well-defined nanoconstructs with selective binding function remains one of the foremost challenges in supramolecular chemistry. Here, we report the discovery of a enantiopure nanocapsule that is formed through the self-assembly of eight amino acid functionalised molecules in nonpolar solvents through 48 hydrogen bonds. The nanocapsule is remarkably robust, being stable at low and high temperatures, and in the presence of base, presumably due to the co-operative geometry of the hydrogen bonding motif. Thanks to small pore sizes, large internal cavity and sufficient dynamicity, the nanocapsule is able to recognize and encapsulate large aromatic guests such as fullerenes C60 and C70. The structural and electronic complementary between the host and C70 leads to its preferential and selective binding from a mixture of C60 and C70., Individual hydrogen bonds are weak, so self-assembling multiple components via hydrogen bonding is a significant challenge. Here the authors report a robust, enantiopure nanocapsule held together by 48 cooperative hydrogen bonds, and use it for the selective binding of C70.
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- 2017
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