A chitosan supported peroxidovanadium(V) complex: Synthesis, characterization and application as an eco-compatible heterogeneous catalyst for selective sulfoxidation in water

被引:11
|
作者
Saikia, Gangutri [1 ]
Ahmed, Kabirun [1 ]
Gogoi, Sandhya Rani [1 ]
Sharma, Mitu [1 ]
Talukdar, Hiya [1 ]
Islam, Nashreen S. [1 ]
机构
[1] Tezpur Univ, Dept Chem Sci, Tezpur 784028, Assam, India
关键词
Peroxidovanadium(V) complex; Chitosan immobilized vanadium(V); Heterogeneous catalysis; Green oxidation catalyst; Aqueous sulfide oxidation; 30-PERCENT HYDROGEN-PEROXIDE; MAGNETIC FE3O4 NANOPARTICLES; CROSS-LINKED CHITOSANS; HEAVY-METAL COMPLEXES; BIOGENIC CO-LIGANDS; ONE-POT SYNTHESIS; ORGANIC-REACTIONS; GREEN OXIDATION; MILD OXIDATION; EFFICIENT CATALYST;
D O I
10.1016/j.poly.2018.11.028
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Anchoring of peroxidovanadium(V) (pV) species to chitosan, a natural chelating polymer, afforded a new and structurally defined immobilized complex, VO(O-2)(2)(NH2)-chitosan (ChpV) which was comprehensively characterized by elemental analysis (CHN, ICP-OES, energy dispersive X-ray spectroscopy), spectral studies (FT-IR, Raman, C-13 NMR, diffuse reflectance UV-Vis and XPS), SEM, XRD, Brunauer-Emmett-Teller (BET) and thermogravimetric analysis (TGA). Apart from being thermally stable, the compound is water-tolerant and non-hygroscopic. The compound effectively facilitated chemoselective oxidation of thioethers with H2O2 in aqueous medium to the respective high purity sulfoxide, in impressive yield (TOF 5628 h(-1)) and with high H2O2 efficiency, under mild reaction condition. In addition to water, the heterogeneous catalyst is highly compatible in a variety of organic solvents and is recyclable for several catalytic cycles without significant loss in selectivity. The catalytic procedure is amenable to ready scalability and is free from halogen, co-catalyst and acidic or any other hazardous additive. (C) 2018 Elsevier Ltd. All rights reserved.
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页码:192 / 205
页数:14
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