Electrochemical and Catalytic Studies of a Manganese(III)Complex with a Tetradentate Schiff-Base Ligand Encapsulated in NaY Zeolite

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Iwona Kuzniarska Biernacka (Author) Other; Otilia Rodrigues (Author) Other; Maria Alice Carvalho (Author) Other; Pier Parpot (Author) Other; Krzysztof Biernacki (Author) Other; Alexandre Lopes Magalhaes (Author) FCUP; Antonio Mauricio Fonseca (Author) Other; Isabel Correia Neves (Author) Other

Journal

Title: European Journal of Inorganic Chemistry

Vol. 2013

Pages: 2768-2776

ISSN: 1434-1948

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 13 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-005-0YK

DOI: 10.1002/ejic.201201517

Abstract (EN): The manganese(III) complex with a Schiff-base salen-type ligand (1,5-bis{[(1E)-(2-hydroxyphenyl)methylene]amino}-1H-imidazole-4-carbonitrile) has been encapsulated in the nanopores of a Y zeolite by using two different methodologies, the flexible ligand and in situ complex preparation methods. Cyclic voltammetry studies revealed that the neat complex undergoes reversible oxidation in dmf, which has been attributed to the MnII/III redox couple, whereas the two heterogeneous catalysts show different electrochemical behaviour in aqueous medium. The encapsulated and non-encapsulated homogeneous MnIIIsalen complexes were screened as catalysts for olefin oxidation by using tBuOOH as the oxygen source in different solvents. Under the optimized conditions, the catalysts exhibited moderate activity. Both heterogeneous catalysts catalysed the oxidation of cyclohexene with tBuOOH, primarily to give the allylic oxidation products. These catalysts were found to be reusable after the catalytic cycle, but with some loss of activity. A DFT study confirmed the distortion of the complex in the zeolite cage, the main difference being observed for the bonded chloride.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9