Interacting Superparamagnetic Iron(II) Oxide Nanoparticles: Synthesis and Characterization in Ionic Liquids

Leal, Bárbara C.; Scholten, Jackson D.; Alves, Maria do Carmo Martins; Morais, Jonder; Pedro, Imanol de; Barquín, Luis Fernández; Dupont, Jaı̈rton

doi:10.1021/acs.inorgchem.5b02320

Cited by 13 publications

(3 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…44,45 The formation of liquid clathrate in ionic liquid-aromatic mixtures can also be described as guest@host complex formation. 46 Moreover, the same water function can explain the oxidation of iron nanoparticles to FeO nanoparticles in oxygen-free ImILs, 47 the stabilisation of enzymes at high temperatures, 48 or the H/D exchange in deuterated solvents of classical 1-alkyl-3-methyl imidazolium ILs, 49 for example.…”

Section: Structure and Behaviour Of The Water@imil In Solutionmentioning

confidence: 99%

Confined water in imidazolium based ionic liquids: a supramolecular guest@host complex case

Zanatta

Girard

Marin

et al. 2016

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

It is well known that the macroscopic physico-chemical properties of ionic liquids (ILs) are influenced by the presence of water that strongly interferes with the supramolecular organization of these fluids. However, little is known about the function of water traces within this confined space and restricted ionic environments, i.e. between cations and anions. Using specially designed ILs namely 1,2,3-trimethyl-1H-imidazol-3-ium imidazol-1-ide (MMMI·Im) and 3-n-butyl-1,2-dimethyl-1H-imidazol-3-ium imidazol-1-ide (BMMI·Im), the structure and function of water have been determined in condensed, solution and gas phases by X-ray diffraction studies, NMR, molecular dynamics simulations (MDS) and DFT calculations. In the solid state the water molecule is trapped inside the ionic network (constituted of contact ion pairs formed by π(+)-π(-) interaction) through strong H-bonds involving the water hydrogens and the nitrogens of two imidazolate anions forming a guest@host supramolecular structure. A similar structural arrangement was corroborated by DFT calculations and MDS. The presence of a guest@host species (H2O@ILpair) is maintained to a great extent even in solution as detected by (1)H-(1)H NOESY-experiments of the ILs dissolved in solvents with low and high dielectric constants. This confined water catalyses the H/D exchange with other substrates containing acidic-H such as chloroform.

show abstract

Section: Structure and Behaviour Of The Water@imil In Solutionmentioning

confidence: 99%

Confined water in imidazolium based ionic liquids: a supramolecular guest@host complex case

Zanatta

Girard

Marin

et al. 2016

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, all calculated values were outside the expected range for superparamagnetic compounds (f = 0.100-0.130) but were within the range of a lot of spin glass systems (f = 0.005-0.06). 48 These values are usually considered to be a fingerprint of the spin glass (SG) or cluster glass (CG)-like behavior of NPs. The latter magnetic behavior detected seems to suggest that, however, in the Ni/Ir NPs, the disordered spin arrangement is overall homogeneous, like a typical SG-like system.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Tuning the structure and magnetic behavior of Ni–Ir-based nanoparticles in ionic liquids

Silva

Bernardi

Abarca

et al. 2018

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

We report on a simple preparation of extremely small diameter (ca. 2 nm) Ni-Ir-based NPs using Ni(COD)2 and [Ir(COD)OCH3]2 in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIm·NTf2). The prepared NPs had either core-shell-like or alloy-like structures with the presence of Ni,Ir-oxides, depending on the synthetic approach. X-ray diffraction (XRD), Rutherford backscattering spectrometry (RBS), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (EXAFS), and magnetic measurements are combined to describe the influence of nanostructure on the magnetic behavior of these nanosystems. The present findings reveal that the alloy NPs display a disordered magnetic state, similar to a spin glass (SG)-like system (Tf = 7.2 K). Core-shell NPs are formed by a magnetically blocked/unblocked core with a magnetically disordered shell as deduced from the two magnetic responses peaking at TB = 75 K and Tf = 5.8 K. Coupling at the core-shell interface leads to an exchange bias revealed at low temperature as horizontal shifts in the hysteresis loops of 0.12 kOe at 2 K.

show abstract

“…For example, smaller (2.3 nm) Pt NPs are obtained by the simple decomposition of a Pt(0) organometallic precursor in hydrophobic 1-n-butyl-3-methylimdazolium hexafluorophosphate IL, whereas larger Pt NPs (3.4 nm) are produced in the hydrophilic tetrafluoroborate IL analogue under the same reaction conditions . Transmission electron microscopy, X-ray photoemission spectroscopy (XPS), and small-angle X-ray scattering (SAXS) analysis clearly show the interactions of the IL with the metal surface, demonstrating the formation of a semiorganized IL protective layer surrounding the platinum nanoparticles. , Different types of iron-oxide and Fe(0) NPs can be also prepared in ILs by the simple decomposition of Fe(0) organometallic precursors and reduction of Fe salts. − Alloys and core–shell Co/Pt, Ru/Pt, Pd/Pt, and Ru/Fe bimetallic NPs are also easily accessible via simple decomposition of their organometallic complexes in ionic liquids. Consequently, ILs may provide adequate templates for the generation of core–shell Fe–Pt NPs.…”

Section: Introductionmentioning

confidence: 99%

Core–Shell Fe–Pt Nanoparticles in Ionic Liquids: Magnetic and Catalytic Properties

Adamski¹,

Qadir²,

Serna

et al. 2018

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

The reaction of Fe(CO)5 and Pt2(dba)3 in 1-n-butyl-methylimidazolium tetrafluoroborate (BMIm.BF4), hexafluorophosphate (BMIm.PF6), and bis(trifluoromethanesulfonyl)imide (BMIm.NTf2) under hydrogen affords stable magnetic colloidal core–shell nanoparticles (NPs). The thickness of the Pt shell layer has a direct correlation with the water stability of the anion and increases in the order of PF6 > BF4 > NTf2, yielding the metal compositions Pt4Fe1, Pt3Fe2, and Pt1Fe1, respectively. Magnetic measurements give evidence of a strongly enhanced Pauli paramagnetism of the Pt shell and a partially disordered iron-oxide core with diminished saturation magnetization. The obtained Pauli paramagnetism of the Pt shell is 2 orders of magnitude higher than that of bulk Pt, owing to symmetry breaking at the surface and interface, resulting in a strong increase in the density of states at the Fermi level, and thus to enhanced Pauli susceptibility. Moreover, these ultrasmall NPs showed efficient catalytic activity for the direct production of selective short-chain hydrocarbons (C1–C6) by the Fischer–Tropsch synthesis with efficient conversion (18–34%) and selectivity (69–90%, C2–C4). The selectivity and activity were dependent on the Fe-oxides@Pt particle size. The catalytic activity decreased from 34 to 18% as the NP size increased from 1.7 to 2.5 nm at 15 bar and 300 °C.

show abstract

Interacting Superparamagnetic Iron(II) Oxide Nanoparticles: Synthesis and Characterization in Ionic Liquids

Cited by 13 publications

References 34 publications

Confined water in imidazolium based ionic liquids: a supramolecular guest@host complex case

Confined water in imidazolium based ionic liquids: a supramolecular guest@host complex case

Tuning the structure and magnetic behavior of Ni–Ir-based nanoparticles in ionic liquids

Core–Shell Fe–Pt Nanoparticles in Ionic Liquids: Magnetic and Catalytic Properties

Contact Info

Product

Resources

About