Tunable synthesis of poly(ethylene imine)–gold nanoparticle clusters

Kretschmer, Florian; Mansfeld, Ulrich; Hoeppener, Stephanie; Hager, Martin D.; Schubert, Ulrich S.

doi:10.1039/c3cc45090b

Cited by 47 publications

(62 citation statements)

References 19 publications

(15 reference statements)

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“…FTIR spectra of in situ bPEI‐SPION are different than free bPEI and nonluminescent LE bPEI‐SPION with a 60 cm −1 shift to lower wavenumber in CN stretching band and lower intensity of NH bending at 1546 cm −1 indicating changes in the chemical environment of amine groups (Figure S10, Supporting Information). The peak at 1630 cm −1 may indicate imine formation, which was also reported for auric acid reduction with PEI and for Fe 2+ reduction with hexadecylamine . XPS also revealed significant differences in the N1s core level binding energies between the ligand exchanged and in situ coated bPEI‐SPIONs ( Figure a,b).…”

Section: Resultssupporting

confidence: 64%

Discovery of an Exceptionally Strong Luminescence of Polyethyleneimine‐Superparamagnetic Iron Oxide Nanoparticles

Ünal

Khodadust

Durmuşoğlu

et al. 2018

Macro Chemistry & Physics

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Polyethyleneimine (PEI) is rarely recognized as a luminescent polymer but is frequently used for the production of cationic nanoparticles and tagged with an organic fluorophore to be tracked optically. Herein, a strongly luminescent, branched PEI‐superparamagnetic iron oxide nanoparticle (bPEI‐SPION) without a traditional fluorophore is reported. A tremendous enhancement (1200 times) in the weak blue luminescence of bPEI is achieved only if it is adsorbed on a SPION during the synthesis of nanoparticles, which is improved further upon protonation, irreversibly. This is quite unexpected since SPIONs are strong absorbers in the visible region. All reaction parameters, different synthetic methods, as well as protonation are studied as independent factors to understand the origin of such enhancement. Detailed spectroscopic analysis and density functional theory calculations indicate that partial amine oxidation and Fe3+ reduction takes place during the synthesis, which significantly contributes to the luminescence enhancement. In addition, PEI‐SPION exhibits excitation wavelength dependent emission and maintains its magnetic properties.

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Section: Resultssupporting

confidence: 64%

Discovery of an Exceptionally Strong Luminescence of Polyethyleneimine‐Superparamagnetic Iron Oxide Nanoparticles

Ünal

Khodadust

Durmuşoğlu

et al. 2018

Macro Chemistry & Physics

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“…In that way, a hetero‐brush could be generated in analogy to poly(styrene)‐ block ‐poly(ethylene oxide) (PS‐ b ‐PEO) brushes on planar surfaces . Therefore, a maleimide‐functionalized tri‐thioacetate was synthesized (Figure S1, Supporting Information) and used for the synthesis of maleimide‐functionalized AuNPs . Possible excess of the maleimide‐linker was removed by centrifugation of the particles (60 min at 5000 rpm), followed by resuspension in DMF (three cycles).…”

Section: Resultsmentioning

confidence: 99%

Poly(2‐vinyl pyridine)‐block‐Poly(ethylene oxide) Featuring a Furan Group at the Block Junction—Synthesis and Functionalization

Rudolph

Barthel

Kretschmer

et al. 2014

Macromol. Rapid Commun.

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Furfuryl glycidyl ether (FGE) represents a highly versatile monomer for the preparation of reversibly cross-linkable nanostructured materials via Diels-Alder reactions. Here, the use of FGE for the mid-chain functionalization of a P2VP-b-PEO diblock copolymer is reported. The material features one furan moiety at the block junction, P2VP68 -FGE-b-PEO390 , which can be subsequently addressed in Diels-Alder reactions using maleimide-functionalized counterparts. The presence of the FGE moiety enables the introduction of dyes as model labels or the formation of hetero-grafted brushes as shell on hybrid Au@Polymer nanoparticles. This renders P2VP68 -FGE-b-PEO390 , a powerful tool for selective functionalization reactions, including the modification of surfaces.

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“…Polyethylenimine (PEI) is a branched, water‐soluble polymer used for a wide variety of applications. As a chelating agent, PEI plays the role of efficient stabilizer during the preparation or assembly of noble metal nanoparticles. PEI modified solids are satisfactory supports of noble metal nanocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Nanopalladium on polyethylenimine–grafted starch: An efficient and ecofriendly heterogeneous catalyst for Suzuki–Miyaura coupling and transfer hydrogenation reactions

Deng

Liu

et al. 2017

Applied Organom Chemis

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Functionalized natural polysaccharides are attractive supports for colloidal metal nanocatalysts due to their abundance, cheapness, biocompatibility and biodegradability. In this study, isocyanate-functionalized starch was prepared by treating with diisocyanate. Polyethylenimine grafted onto starch via the formation of urea linker. The palladium nanoparticles deposited starch PEIS@Pd(0) was obtained through a chelating-in situ reduction procedure. Characterization of these materials was done using Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and inductive coupled plasma atomic emission spectrometry. The catalytic activity of PEIS@Pd(0) was then tested in two series of model reactions: Suzuki-Miyaura coupling and transfer hydrogenation. The catalyst could be recovered by simple filtration and was reused for five times without significant loss of catalytic activity, which confirmed the good stability of the catalyst.

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Tunable synthesis of poly(ethylene imine)–gold nanoparticle clusters

Cited by 47 publications

References 19 publications

Discovery of an Exceptionally Strong Luminescence of Polyethyleneimine‐Superparamagnetic Iron Oxide Nanoparticles

Discovery of an Exceptionally Strong Luminescence of Polyethyleneimine‐Superparamagnetic Iron Oxide Nanoparticles

Poly(2‐vinyl pyridine)‐block‐Poly(ethylene oxide) Featuring a Furan Group at the Block Junction—Synthesis and Functionalization

Nanopalladium on polyethylenimine–grafted starch: An efficient and ecofriendly heterogeneous catalyst for Suzuki–Miyaura coupling and transfer hydrogenation reactions

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