Oxovanadium(IV) complexes with N-salicylideneamino acids

Theriot, L. J.; Carlisle, G.O.; Hu, Hang

doi:10.1016/0022-1902(69)80200-9

Cited by 71 publications

(22 citation statements)

References 5 publications

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“…Vanadyl acetylacetonate (VO(acac) 2 ) is shown to be a good vanadium precursor for synthesizing oxovanadium complexes [28][29][30]. The replacement of an acetylacetonato ligand by bidentate and tridentate chiral ligands provides a way of producing optically actively vanadium complexes, which have been extensively used in asymmetric catalysis.…”

Section: Introductionmentioning

confidence: 99%

Improved Low-Temperature Activity of V2O5-WO3/TiO2 for Denitration Using Different Vanadium Precursors

Gan

Guo

et al. 2016

Catalysts

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This work tested two V 2 O 5 -WO 3 /TiO 2 catalysts with different vanadium precursors for selective catalytic reduction (SCR) of flue gas NO using NH 3 at 150-450˝C. While catalyst A was prepared using ammonium metavanadate (NH 4 VO 3 ) through incipient impregnation, catalyst B was made according to the solvothermal method using vanadyl acetylacetonate (VO(acac) 2 ) as the vanadium precursor. The catalytic evaluation for denitration was in a laboratory fixed bed reactor using simulated flue gas under conditions of a gas hourly space velocity (GHSV) of 40,000 h´1 and an NH 3 /NO molar ratio of 0.8. Without SO 2 and water vapor in the flue gas at 200˝C, the realized NO conversion was 56% for catalyst A but 80% for B. The presence of 350 ppm SO 2 and 10 vol. % water vapor in the flue gas slightly reduced the NO conversion over catalyst B, and its activity was stable in a 108-h continuous test at temperatures varying from 450˝C to 220˝C. Via fourier transformation infrared spectroscopy (FT-IR) and thermogravimetric (TG) analysis, it was shown that over catalyst B a dynamic balance between the formation and decomposition of ammonium sulfite or sulfate is built possibly at temperatures as low as 220˝C. For this catalyst there was a higher surface atomic concentration of vanadium and a higher ratio of V 4+ /(V 4+ + V 5+ ), while the NH 3 adsorption test revealed more acidic sites on catalyst B. The study discloses a potentially new approach to prepare a V 2 O 5 -WO 3 /TiO 2 catalyst with good performance for SCR of flue gas NO at 220-300˝C.

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Section: Introductionmentioning

confidence: 99%

Improved Low-Temperature Activity of V2O5-WO3/TiO2 for Denitration Using Different Vanadium Precursors

Gan

Guo

et al. 2016

Catalysts

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“…45 In 2003, chiral oxovanadium complex 32 derived from (S)-3-formyl-1,1 0 -bi-2-naphthol with chiral amino acids and vanadyl sulfate have been synthesized aiming to enhance the catalytic enantioselective coupling of 2-naphthols. 47,61 While the reaction rate was improved to some extent, ee was moderate (Scheme 16). It was assumed that the phenoic hydroxyl group activated the oxovanadium complex to accelerate the oxidative coupling of 2-naphthols 27.…”

Section: -50mentioning

confidence: 92%

“…The first heterogeneous catalyst in this field was developed by Iwasawa and coworkers [63][64][65][66][67] in 2004. Chiral selfdimerization of vanadium Schiff base complexes was found to occur on a SiO 2 surface when V-monomer precursors 61 were impregnated on SiO 2 (Aerosil 200, calcined at 773K for 2h) surfaces via a chemical reaction with surface silanols in dehydrated ethanol followed by evacuation of the solvent to produce a novel SiO 2 -supported chiral V-dimer. The formed vanadium dimmer 34 with unsaturated chiral vanadium metal centers is active for the enantioselective oxidative coupling of 2-naphthols with 100% selectivity.…”

Section: -50mentioning

confidence: 99%

Recent advances in asymmetric oxidative coupling of 2‐naphthol and its derivatives

Wang

2010

Chirality

118

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“…The complexes were synthesized using [VO(L)(H20)] (12) species. Electrochemical grade Et4NC104 (TEAP), MeOH and CHzC12 were prepared by a reported method (13).…”

Section: Methodsmentioning

confidence: 99%

Mixed-ligand oxovanadium(V) complexes incorporating bidentate salicylaldehyde and tridentate aldimine ligands

Rath

Mondal

Ghosh

1996

Transition Met Chem

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Mixed-ligand oxovanadium(V) complexes, [vvo(L) -(sal)], containing salicylaldimine ligands of c~-amino acids HzL [,,(1); R = Me, i-Pr and CHzPh ] and salicylaldehyde (Hsal) have been synthesized. The coordination sphere of the complexes is of the VO(ONO)(OO) type, where O atoms are phenolic, carboxylic and aldehydic, and N is of the azomethine type. The complexes are diamagnetic and exhibit only one LMCT band at ca. 490nm. They display quasi-reversible one-electron reduction peaks in a CHzClz-MeCN (2:1v/v) mixture in the 0.07-0.13V versus s.c.e, range. A trend in the redox potential data has been rationalized on the basis of conventional normal substituent effects.

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Oxovanadium(IV) complexes with N-salicylideneamino acids

Cited by 71 publications

References 5 publications

Improved Low-Temperature Activity of V2O5-WO3/TiO2 for Denitration Using Different Vanadium Precursors

Improved Low-Temperature Activity of V2O5-WO3/TiO2 for Denitration Using Different Vanadium Precursors

Recent advances in asymmetric oxidative coupling of 2‐naphthol and its derivatives

Mixed-ligand oxovanadium(V) complexes incorporating bidentate salicylaldehyde and tridentate aldimine ligands

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