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Your search keyword '"Knöfel, Nicolai D."' showing total 19 results
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19 results on '"Knöfel, Nicolai D."'

3. Heterobimetallic Eu(iii)/Pt(ii) single-chain nanoparticles: a path to enlighten catalytic reactions

Author

Knöfel, Nicolai D., Rothfuss, Hannah, Tzvetkova, Pavleta, Kulendran, Bragavie, Barner-Kowollik, Christopher, Roesky, Peter W., Knöfel, Nicolai D., Rothfuss, Hannah, Tzvetkova, Pavleta, Kulendran, Bragavie, Barner-Kowollik, Christopher, and Roesky, Peter W.

Abstract

We introduce the formation and characterization of heterometallic single-chain nanoparticles entailing both catalytic and luminescent properties. A terpolymer containing two divergent ligand moieties, phosphines and phosphine oxides, is synthesized and intramolecularly folded into nanoparticlesviaa selective metal complexation of Pt(ii) and Eu(iii). The formation of heterometallic Eu(iii)/Pt(ii) nanoparticles is evidenced by size exclusion chromatography, multinuclear NMR (1H,31P{1H},19F,195Pt) as well as diffusion-ordered NMR and IR spectroscopy. Critically, we demonstrate the activity of the SCNPs as a homogeneous and luminescent catalytic system in the amination reaction of allyl alcohol.

Published
2020

18. Phenanthroline—A Versatile Ligand for Advanced Functional Polymeric Materials.

Author

Baraban, Sergej, Rothfuss, Hannah, Barner‐Kowollik, Christopher, Knöfel, Nicolai D., Roesky, Peter W., Tzvetkova, Pavleta, Michenfelder, Nadine C., and Unterreiner, Andreas‐Neil

Subjects
PHENANTHROLINE, SUPRAMOLECULAR chemistry, POLYMERS, POLYMERIZATION, MAGNETIC resonance microscopy
Abstract

The controlled incorporation of phenanthroline moieties into polymers is introduced, demonstrating their application as metal‐ion complexing ligands for the construction of advanced macromolecular structures. Specifically, two phenanthroline‐containing monomers based on acrylate and styrene functionalities, were synthesized. Each monomer was readily copolymerized with either N,N‐dimethylacrylamide or styrene via nitroxide‐mediated polymerization, resulting in narrowly distributed polar or non‐polar copolymers. To demonstrate the versatility of the established polymer systems, the polar polymer was employed for transition metal induced single‐chain nanoparticle formation, verified by diffusion‐ordered NMR and UV/Vis spectroscopy. Furthermore, the non‐polar polymer allows facile incorporation of lanthanide ions, creating luminescent metallo‐polymers, in‐depth characterized by advanced photophysical experiments and 2D NMR measurements. One Ligand to Rule them All: Phenanthroline‐ligands in polymer chains, for task‐specific incorporation of metal‐ions, enable the construction of advanced metal‐derived macromolecular architectures. The resulting soft matter materials exhibit remarkable characteristics upon metal coordination, paving the way to a metallo‐polymer technology platform. [ABSTRACT FROM AUTHOR]

Published
2018
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19. Front Cover: Phenanthroline—A Versatile Ligand for Advanced Functional Polymeric Materials (Chem. Eur. J. 66/2018).

Author

Baraban, Sergej, Rothfuss, Hannah, Barner‐Kowollik, Christopher, Knöfel, Nicolai D., Roesky, Peter W., Tzvetkova, Pavleta, Michenfelder, Nadine C., and Unterreiner, Andreas‐Neil

Subjects
PHENANTHROLINE, LIGANDS (Chemistry), POLYMERS
Abstract

The synthesis of phenanthroline‐containing polymer chains enables the subsequent incorporation of metal‐ions to generate functional macromolecular architectures. Using nitroxide‐mediated polymerization techniques, both polar and non‐polar polymers can be task‐specifically designed, readily extendable for their applications. Phenanthroline‐functionalized polymer chains hold unique potential as a platform for metal‐complexed single‐chain technology or as fluorescent soft matter material. More information can be found in the Full Paper by A.‐N. Unterreiner, P. W. Roesky, C. Barner‐Kowollik, et al. on page 17475. [ABSTRACT FROM AUTHOR]

Published
2018
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