Infrared Transmision and Photoacoustic Spectra (PAS) of Europium(III) Chelates with Schiff Bases. Part 1. Complex with H<sub>2</sub>salen

Nowicki, W.; Sikorska, A.; Zachara, Stanislaw

doi:10.1080/00387019508011656

Cited by 1 publication

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was assigned to stretching vibrations of the CN bond with some contributions of vibrations of the phenyl rings and CO group chelating the metal atom 31. 32 The transition moment corresponding to this band should lie within the average MnN 2 O 2 plane of 3 (even though its exact orientation within this plane is unknown). It may therefore be used as a probe of the orientation of the catalytic center.…”

Section: Resultsmentioning

confidence: 99%

Monolayers of Salen Derivatives as Catalytic Planes for Alkene Oxidation in Water

Pasc-Banu

Sugisaki

Gharsa

et al. 2005

Chemistry A European J

View full text Add to dashboard Cite

Monolayers at the gas/water interface have been used as an adjustable catalytic system in which the molecular density may be modified. Mn(III)-salen complexes bearing perfluoroalkyl substituents have been organized as a Langmuir film on an aqueous subphase containing a urea/hydrogen peroxide adduct (UHP, the oxidant) and cinnamyl alcohol (the substrate). The catalytic activity of the monolayer for the epoxidation of the alkene dissolved in water has been demonstrated and the reaction kinetic investigated. For a constant area per molecule of catalyst, the reaction rate exhibits first-order dependence on oxidant concentration and zero-order dependence on alkene concentration, in agreement with the reaction orders reported for Mn(III)-salen-catalyzed epoxidation reactions carried out in solution. Furthermore, kinetic experiments suggest an enhanced activity of the catalysts assembled in a Langmuir film relative to that observed in bulk reaction. Finally, varying the molecular density of the catalyst at the gas/water interface highlights an important dependence of the catalytic activity of the layer with the mean molecular area. A strong increase of the catalytic properties of the monolayer was observed for a mean molecular area of 140-145 A2, an increase which was supposedly related to a modification of the Mn(III)-salen complex orientation at the interface upon compression. This hypothesis was supported by PM-IRRAS (polarization modulation infrared reflection adsorption spectroscopy) experiments performed in situ on the monolayer. Such results demonstrate that a soft and adjustable molecular system like a Langmuir film can be used to better understand the reactivity in various heterogeneous and/or pseudohomogeneous (such as those based on dendrimers) catalytic systems.

show abstract

Section: Resultsmentioning

confidence: 99%

Monolayers of Salen Derivatives as Catalytic Planes for Alkene Oxidation in Water

Pasc-Banu

Sugisaki

Gharsa

et al. 2005

Chemistry A European J

View full text Add to dashboard Cite

show abstract

Infrared Transmision and Photoacoustic Spectra (PAS) of Europium(III) Chelates with Schiff Bases. Part 1. Complex with H₂salen

Cited by 1 publication

References 13 publications

Monolayers of Salen Derivatives as Catalytic Planes for Alkene Oxidation in Water

Monolayers of Salen Derivatives as Catalytic Planes for Alkene Oxidation in Water

Contact Info

Product

Resources

About

Infrared Transmision and Photoacoustic Spectra (PAS) of Europium(III) Chelates with Schiff Bases. Part 1. Complex with H2salen

Cited by 1 publication

References 13 publications

Monolayers of Salen Derivatives as Catalytic Planes for Alkene Oxidation in Water

Monolayers of Salen Derivatives as Catalytic Planes for Alkene Oxidation in Water

Contact Info

Product

Resources

About

Infrared Transmision and Photoacoustic Spectra (PAS) of Europium(III) Chelates with Schiff Bases. Part 1. Complex with H₂salen