122-03-2Relevant articles and documents
A polyoxometalate@covalent triazine framework as a robust electrocatalyst for selective benzyl alcohol oxidation coupled with hydrogen production
Li, Zhen,Zhang, Junhao,Jing, Xiaoting,Dong, Jing,Liu, Huifang,Lv, Hongjin,Chi, Yingnan,Hu, Changwen
, p. 6152 - 6159 (2021)
Electrocatalytic oxidation has been proven as a sustainable and promising alternative to traditional chemical transformation, but its further development is limited by the use of noble-metal electrocatalysts. Herein, a polyoxometalate-based electrode material,H5PMo10V2O40@CTF(denoted asPMo10V2@CTF), has been successfully fabricated through electrostatic assembly of a molecular polyoxometalate catalyst,PMo10V2, with a porous cationic covalent triazine framework (CTF), which, to our knowledge, represents the first combination of polyoxometalate with a cationic CTF. The resultingPMo10V2@CTFexhibits high activity for the selective electrocatalytic oxidation of alcohols to aldehydes, achieving 99% conversion of benzyl alcohol, over 99% selectivity of benzyl aldehyde, and at the same time near unity H2production. Notably, the reported electrocatalytic system presents good atom economy, high energy conversion (96% faradaic efficiency), remarkable catalytic activity and robustness for at least eight recycles. Based on the various experimental and spectroscopic analyses, a possible catalytic mechanism was proposed, revealing that such excellent electrocatalytic performance is attributed to the versatile redox ability ofPMo10V2and the good porosity and adsorption property of the CTF in the constructedPMo10V2@CTFcomposite.
Comparison of selective oxidation of aromatic alcohols using copper(II) chromite-titanium dioxide nanocomposite at reflux, light irradiation, and microwave conditions
Shojaei, Abdollah Fallah,Shirini, Farhad,Hedayati, Elaheh
, p. 1312 - 1317 (2017)
CuCr2O4/TiO2 nanocomposites with different TiO2 contents were synthesized by using sol-gel method. Products were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Results demonstrated a cubic normal spinel structure for copper (2+) chromite, with the particle sizes of about 25–40 nm. Activities of CuCr2O4 nanopowders and CuCr2O4/TiO2 nanocomposite were tested for oxidation of benzylic alcohols to aldehydes at reflux, light irradiation, and microwave conditions. The influence of some parameters on the oxidation of alcohol, such as optimum molar ratio of chromite to titanium dioxide, catalyst dosage, and type and amount of oxidant and solvents (dichloromethane, acetonitrile, and ethanol) was studied to determine the optimal operating conditions for alcohol oxidation in reflux, light irradiation, and microwave conditions.
Gold nanoparticles supported on Cs2CO3 as recyclable catalyst system for selective aerobic oxidation of alcohols at room temperature
Karimi, Babak,Kabiri Esfahani, Farhad
, p. 5555 - 5557 (2009)
NaAuCl4/Cs2CO3 was found to be a simple bench top, recyclable and selective catalyst system for the aerobic oxidation of various types of alcohols into their corresponding aldehydes and ketones at room temperature without the need for any further polymeric and/or oxidic support.
A chloro bridged Cu(II)-Cu(II) complex of a new aminophenol ligand: Magnetostructural, radical decay kinetic studies, highly efficient and aerial alcohol oxidation
Balaghi, S. Esmael,Safaei, Elham,Rafiee, Mohammad,Kowsari, Mohammad Hossein
, p. 94 - 103 (2012)
A new tripodal aminophenol-based ligand containing a pyridine unit was synthesized and characterized by IR and 1H NMR spectroscopic techniques. A dimeric copper(II) complex of this ligand was prepared and characterized by X-ray crystallography, DFT calculations, spectroscopic techniques and magnetic susceptibility measurements. X-ray analysis revealed a complex in which one phenolate, and amine and imine nitrogens of the ligand are arranged in a distorted square pyramidal geometry (SP) around the copper ions. Two chloride bridges hold both copper atoms together to form the binuclear [LAphCuCl]2 complex. This complex exhibits nearly no superexchange coupling between the copper centers. The phenolate moieties of the copper complex were electrochemically oxidized to phenoxyl radical cations [LAphCuCl]2+. The decay kinetics of the mentioned radical were investigated using a simulation of the voltammogram data. In addition, highly efficient and eco-friendly oxidation of alcohols to aldehydes was achieved with molecular oxygen or air as the oxidant and the [LAphCuCl]2-Cs2CO3 system as a catalyst.
Design and development of natural and biocompatible raffinose-Cu2O magnetic nanoparticles as a heterogeneous nanocatalyst for the selective oxidation of alcohols
Eivazzadeh-Keihan, Reza,Esmaeili, Mir Saeed,Ghafuri, Hossein,Maleki, Ali,Varzi, Zahra
, (2020)
Natural polymers are recently playing a vital role as a support for the noble metals. In the present study, raffinose from the classes of oligosaccharide polymer with a high capacity of magnetization was used as active support for the copper metal. The copper immobilized on the raffinose-based magnetic nanoparticles (MNPs) which can be used as a recyclable heterogeneous nanocatalyst for the selective oxidation of primary benzyl alcohols (PBA) to benzaldehyde (BAD) derivatives. The morphology and structure of the recoverable magnetic nanocatalyst were characterized using different microscopic and spectroscopic techniques including FT-IR, GC, VSM, XRD, TEM, TGA, FESEM and EDS analyses. Also, the optimum conditions of co-reactant, reaction time, oxidant, temperature and amount of the nanocatalyst for oxidation reaction were investigated. Moreover, the Fe3O4?raffinose-Cu2O NPs had a significant effect to enhance yield and reduce the reaction time.
Bimetallic synergistic Au/CuO-hydroxyapatite catalyst for aerobic oxidation of alcohols
Tian, Tao,Liu, Ying,Zhang, Xungao
, p. 1358 - 1364 (2015)
A catalyst consisting of Au supported on copper oxide-modified hydroxyapatite (Au/CuO-HAP) was prepared using a homogeneous deposition-precipitation method. The catalyst was characterized using atomic absorption spectrometry, N2 adsorption-desorption, powder X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The catalytic performance in liquid-phase aerobic oxidation of alcohols was investigated. The catalytic activity and benzaldehyde selectivity in benzyl alcohol oxidation with the bimetallic Au/CuO-HAP catalyst were significantly better than those with monometallic Au/HAP and CuO-HAP catalysts. The conversion of benzyl alcohol and selectivity for benzaldehyde at 120 °C for 1.5 h under aerobic oxidation conditions were 99.7% and 98.4%, respectively. Various aromatic alcohols were selectively converted to their corresponding aldehydes or ketones over Au/CuO-HAP. The Au/CuO-HAP catalyst could be reused at least four times without loss of activity.
Preparation of large-size, superparamagnetic, and highly magnetic Fe3O4@PDA core-shell submicrosphere-supported nano-palladium catalyst and its application to aldehyde preparation through oxidative dehydrogenation of benzyl alcohols
Guo, Haichang,Zheng, Renhua,Jiang, Huajiang,Xu, Zhenyuan,Xia, Aibao
, (2019)
Large-size, superparamagnetic, and highly magnetic Fe3O4@PDA core-shell submicrospheresupported nano-palladium catalysts were prepared in this study. Dopamine was encapsulated on the surface of Fe3O4 particles via self-polymerization and then protonated to positively charge the microspheres. PdCl42- was dispersed on the surface of the microspheres by positive and negative charge attraction and then reduced to nano-palladium. With air as oxidant, the catalyst can successfully catalyze the dehydrogenation of benzyl alcohols to produce the corresponding aldehydes at 120 °C.
Three new imidazole-functionalized hexanuclear oxidovanadium clusters with exceptional catalytic oxidation properties for alcohols
Chen, Baokuan,Huang, Xianqiang,Wang, Boe,Lin, Zhengguo,Hu, Jufang,Chi, Yingnan,Hu, Changwen
, p. 4408 - 4413 (2013)
Cluster cat: Three new imidazole-functionalized neutral hexanuclear vanadium clusters have been prepared, one of which shows exceptional catalytic activity in the selective aerobic oxidation of alcohols (see scheme). Furthermore, these new polyoxovanadium clusters can be readily recycled and reused with unchanged catalytic activity. A plausible catalytic cycle is also proposed. Copyright
Multifunctional radical-doped polyoxometalate-based host-guest material: Photochromism and photocatalytic activity
Liao, Jian-Zhen,Zhang, Hai-Long,Wang, Sa-Sa,Yong, Jian-Ping,Wu, Xiao-Yuan,Yu, Rongmin,Lu, Can-Zhong
, p. 4345 - 4350 (2015)
An effective strategy to synthesize multifunctional materials is the incorporation of functional organic moieties and metal oxide clusters via self-assembly. A rare multifunctional radical-doped zinc-based host-guest crystalline material was synthesized with a fast-responsive reversible ultraviolet visible light photochromism, photocontrolled tunable luminescence, and highly selective photocatalytic oxidation of benzylic alcohols as a result of blending of distinctively different functional components, naphthalenediimide tectons, and polyoxometalates (POMs). It is highly unique to link π-electron-deficient organic tectons and POMs by unusual POMs anion-π interactions, which are not only conducive to keeping the independence of each component but also effectively promoting the charge transfer or exchange among the components to realize the fast-responsive photochromism, photocontrolled tunable luminescence, and photocatalytic activity.
Tuning of the redox potential and catalytic activity of a new Cu(ii) complex by: O -iminobenzosemiquinone as an electron-reservoir ligand
Nasibipour, Mina,Safaei, Elham,Wrzeszcz, Grzegorz,Wojtczak, Andrzej
, p. 4426 - 4439 (2020)
The synthesis and characterization of a new Cu(ii) complex, LNIS2CuII (LNIS = o-iminobenzosemiquinone), are reported. X-ray crystallography studies showed that two o-iminobenzosemiquinone radicals form a distorted square-planar geometry around the Cu(ii) center of LNIS2CuII. Magnetic measurements revealed the paramagnetic character of the complex caused by the presence of three unpaired electrons located on the o-iminobenzosemiquinonate ligands and the CuII center. Magnetochemical experiments, and EPR and DFT studies prove that the ground state of the complex is a doublet, which is consistent with the ferromagnetic coupling between Cu(ii) and o-iminobenzosemiquinone centers and stronger antiferromagnetic coupling between the iminobenzosemiquinone moieties. The ligand-centered redox reactions of the complex were studied by cyclic voltammetry. Aerobic oxidation of alcohols to aldehydes with TEMPO was studied in the presence of LNIS2CuII. Furthermore, LNIS2CuII was found to be an efficient catalyst in homo-coupling of terminal alkynes.
