Nanosized MoO₃ as a reusable heterogeneous catalyst for the synthesis of 2,6-bis(benzylidene)cyclohexanones

Abstract

Crystalline MoO3 nanoparticles were obtained by electrochemical synthesis process using tetrapropylammonium bromide as a stabilizer and structure-directing agent in ACN:THF(4:1) solvent. Formation of MoO3 nanoparticles took place at a constant supply current of 14 mA/cm2. These synthesized MoO3 nanoparticles were characterized by UV-Vis spectroscopy, FT-IR spectroscopy, powder X-ray diffraction (XRD), scanning electron microscopy (SEM). So prepared MoO3 nanoparticles were used as a heterogeneous catalyst for the synthesis of 2,6-bis(benzylidene)cyclohexanone derivatives. This protocol offers several advantages, such as simple work-up procedure, recyclability of the catalyst, excellent product yield in a short reaction time and purification of products with a non-chromatographic method.

Characterization of hierarchicalα-MoO3plates toward resistive heating synthesis: electrochemical activity ofα-MoO3/Pt modified electrode toward methanol oxidation at neutral pH

“…Orthorhombic molybdenum (Mo) trioxide (α-MoO 3 ), is a kind of layered transition metal oxide comprising dual layers of planar crystals of distorted MoO 6 octahedra, held together in the vertical [010] direction, thanks to the van der Waals force. In recent years, MoO 3 nanostructures have attracted high interest for use in many technological and industrial applications, including gas sensors [3][4][5][6], photodetectors [7,8], cathodes or anodes in lithium ion batteries [9][10][11], photochromic and electrochromic devices [12], catalysts [13][14][15], capacitors [16,17], photovoltaic cells [18,19], field emission devices [20,21] and so on. The MoO 3 structures have been obtained by different methods, i.e.…”

Microwave‐assisted synthesis of blue fluorescent molybdenum nanoclusters with maltose‐cysteine Schiff base for detection of myoglobin and γ‐aminobutyric acid in biofluids

“…The diffraction peaks (2θ) at 23.92°, 27.74°, 31.8°, 32.74°, 45.59°, 49.09°, and 56.66° corresponded to the lattice planes of 110, 021, 101, 111, 041, 200, 002, which were indexed to the orthorhombic structure of DAM‐cysteine‐MoNCs. [ 44,45 ] Further, the average crystallite size was 7.91 nm, estimated by the Debye–Scherrer formula D = 0.9 λ /( β cos θ ), where D is the crystallite size, λ is X‐ray wavelength ( λ = 1.5406 Å), β is the full width at half maximum (FWHM) of the most intense peak, and θ is the Bragg diffraction angle. The lifetime of DAM‐cysteine‐MoNCs was examined, and its average was 2.67 ns (Figure S10).…”

Synthesis of molybdenum nanoclusters from Vitex negundo leaves for sensing epinephrine in a pharmaceutical composition

“…The sharp diffraction peaks (2 θ ) at 19.98°, 24.48°, 27.24°, 31.46°, 32.14°, 39.74°, and 49.40° representing the lattice planes (200), (110), (021), (130), (111), (060) and (002) confirm the crystalline structure of V. negundo -MoNCs. 39–42…”

“…The sharp diffraction peaks (2θ) at 19.98°, 24.48°, 27.24°, 31.46°, 32.14°, 39.74°, and 49.40°representing the lattice planes (200), (110), (021), (130), (111), (060) and (002) confirm the crystalline structure of V. negundo-MoNCs. [39][40][41][42] The elemental composition and oxidation states of V. negundo-MoNCs were explored by X-ray photoelectron spectroscopy (XPS). The presence of Mo, C, N, S and O in the obtained V. negundo-MoNCs was verified by the survey spectra of XPS (Fig.…”