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| Hauptseite > Publikationsdatenbank > Soft, Wet-Chemical Synthesis of Metastable Superparamagnetic Hexagonal Close-Packed Nickel Nanoparticles in Different Ionic Liquids > print |
| Hauptseite > Publikationsdatenbank > Soft, Wet-Chemical Synthesis of Metastable Superparamagnetic Hexagonal Close-Packed Nickel Nanoparticles in Different Ionic Liquids > print |
| 001 | 840176 | ||
| 005 | 20210129231752.0 | ||
| 024 | 7 | _ | |a 10.1002/chem.201605251 |2 doi |
| 024 | 7 | _ | |a 0947-6539 |2 ISSN |
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| 100 | 1 | _ | |a Wegner, Susann |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a Soft, Wet-Chemical Synthesis of Metastable Superparamagnetic Hexagonal Close-Packed Nickel Nanoparticles in Different Ionic Liquids |
| 260 | _ | _ | |a Weinheim |c 2017 |b Wiley-VCH |
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| 520 | _ | _ | |a The microwave-induced decomposition of bis{N,N′-diisopropylacetamidinate}nickel(II) [Ni{MeC(NiPr)2}2] or bis(1,5-cyclooctadiene)nickel(0) [Ni(COD)2] in imidazolium-, pyridinium-, or thiophenium-based ionic liquids (ILs) with different anions (tetrafluoroborate, [BF4]−, hexafluorophosphate, [PF6]−, and bis(trifluoromethylsulfonyl)imide, [NTf2]−) yields small, uniform nickel nanoparticles (Ni NPs), which are stable in the absence of capping ligands (surfactants) for more than eight weeks. The soft, wet-chemical synthesis yields the metastable Ni hexagonal close-packed (hcp) and not the stable Ni face-centered cubic (fcc) phase. The size of the nickel nanoparticles increases with the molecular volume of the used anions from about 5 nm for [BF4]− to ≈10 nm for [NTf2]− (with 1-alkyl-3-methyl-imidazolium cations). The n-butyl-pyridinium, [BPy]+, cation ILs reproducibly yield very small nickel nanoparticles of 2(±1) nm average diameter. The Ni NPs were characterized by high-resolution transmission electron microscopy (HR-TEM) and powder X-ray diffraction. An X-ray photoelectron spectroscopic (XPS) analysis shows an increase of the binding energy (EB) of the electron from the Ni 2p3/2 orbital of the very small 2(±1) nm diameter Ni particles by about 0.3 eV to EB=853.2 eV compared with bulk Ni0, which is traced to the small cluster size. The Ni nanoparticles show superparamagnetic behavior from 150 K up to room temperature. The saturation magnetization of a Ni (2±1 nm) sample from [BPy][NTf2] is 2.08 A m2 kg−1 and of a Ni (10±4 nm) sample from [LMIm][NTf2] it is 0.99 A m2 kg−1, ([LMIm]=1-lauryl-3-methyl- imidazolium). The Ni NPs were active catalysts in IL dispersions for 1-hexene or benzene hydrogenation. Over 90 % conversion was reached under 5 bar H2 in 1 h at 100 °C for 1-hexene and a turnover frequency (TOF) up to 1330 molhexane (molNi)−1 h−1 or in 60 h at 100 °C for benzene hydrogenation and TOF=23 molcyclohexane (molNi)−1 h−1. |
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| 700 | 1 | _ | |a Rutz, Christina |0 P:(DE-HGF)0 |b 1 |
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| 700 | 1 | _ | |a Barthel, Juri |0 P:(DE-Juel1)130525 |b 3 |
| 700 | 1 | _ | |a Bushmelev, Alexey |0 P:(DE-HGF)0 |b 4 |
| 700 | 1 | _ | |a Schmidt, Annette |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a Dilchert, Katharina |0 P:(DE-HGF)0 |b 6 |
| 700 | 1 | _ | |a Fischer, Roland A. |0 P:(DE-HGF)0 |b 7 |
| 700 | 1 | _ | |a Janiak, Christoph |0 0000-0002-6288-9605 |b 8 |e Corresponding author |
| 773 | _ | _ | |a 10.1002/chem.201605251 |g Vol. 23, no. 26, p. 6330 - 6340 |0 PERI:(DE-600)1478547-x |n 26 |p 6330 - 6340 |t Chemistry - a European journal |v 23 |y 2017 |x 0947-6539 |
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