Photochemical synthesis and characterization of novel samarium oxide nanoparticles: toward a heterogeneous Brønsted acid catalyst

Abstract

Samarium oxide nanoparticles (Sm 2 O 3 NP) were prepared photochemically for the first time. Characterization shows spherical, polydisperse Sm 2 O 3 NP stabilized by 4-HEBA, a substituted benzoic acid.The Sm 2 O 3 NP also possess Brønsted acidity. This new material may prove to be a potent heterogeneous acid catalyst.Scheme 1 Photochemical preparation of Sm 2 O 3 NP in CH 3 CN. The small arrow in eqn (2) denotes the eventual reduction of the intermediate to 4-HEBA. In eqn (3), n equals 1 or 2 but not 3, as metallic samarium has not been observed. Fig. 4 SEM image of Sm 2 O 3 NP after repeated exposure to 2 mM NaOH and subsequent washing with CH 3 CN.This journal is

Dye synthesis in the Pechmann reaction: catalytic behaviour of samarium oxide nanoparticles studied using single molecule fluorescence microscopy

“…It has previously been reported that the solid Sm 2 O 3 NP are polydisperse, ranging in size from approximately 70–700 nm. 24 As would be expected, those observed in the supernatant were at the low end of this range. Dynamic Light Scattering (DLS) suggested a mean hydrodynamic diameter less than 150 nm (Table S1, ESI † ).…”

“…Sm 2 O 3 NP were photochemically prepared and characterized according to reported protocols. 24 The Pechmann trans-esterification and condensation reaction was carried out using a 1 : 2 molar ratio of 8-hydroxyjulolidine ( 1 ) to ethyl 4,4,4-trifluoroacetoacetate ( 2 ). This amounted to 0.211 mmol of the latter and 0.106 mmol of limiting reagent.…”

“… 21 – 23 We recently reported on the photochemical synthesis and characterization of novel samarium oxide nanoparticles (Sm 2 O 3 NP) possessing Brønsted acidity. 24 We show here that Sm 2 O 3 NP can efficiently catalyze the formation of coumarin 153 via the Pechmann reaction and focus on the use of TIRFM to establish the mode of catalysis at work.…”

Structural and optical properties of synthesized poly(methyl methacrylate) (PMMA) and lanthanide $$\upbeta $$-diketonate complexes incorporated electrospun PMMA nanofibres for optical devices

“…2 software and found that the obtained XRD patterns are in good agreement with samarium oxide and neodymium oxide. The broadened peaks observed at 20 and 39 • in the complex samples indicate their amorphous nature [23,24]. The XRD pattern obtained for the sample containing the samarium and neodymium complexes incorporated into PMMA nanofibre (figure 4d) is the same as that observed for pure PMMA.…”

Tailoring the photoluminescent properties of samarium and dysprosium codoped calcium zirconate perovskites for WLED applications

“…Figure shows the XPS data of the CaZr 0.9 Sm 0.025 Dy 0.075 O 3 sample and the presence of calcium, zirconium, oxygen, dysprosium, and samarium were detected in the sample. The peaks centered at 1079.0 and 1100.5 eV correspond to the 3d 5/2 and 3d 3/2 states of Sm 3+ , peak at 157 eV indicates the presence of 4d 3/2 state of Dy 4d core level corresponding to Dy 3+ ions, peaks at 345.93 and 438.73 eV corresponds to the 2p 3/2 and 2s states of calcium, peak at 182.78 eV 3d 5/2 state of Zr 4+ .…”