Wydział Chemii

Nader Noshiranzadeh

Marzieh Emami

Rahman Bikas

Katarzyna Ślepokura

Tadeusz Lis

2014

Polyhedron

72

56-65

10.1016/j.poly.2014.01.020

Naukowa

Angielski

Artykuł

Two new mononuclear complexes of manganese(III), [Mn(bp)(N₃)(CH₃OH)]·0.5CH₃OH (1) and [Mn(bp)(NCS)_0.9(NO₃)_0.1(CH₃OH)]·CH₃OH (2), have been synthesized, where H₂bp is 6,6′-(pyridin-2-ylmethylazanediyl)bis(methylene)bis(2,4-di-tert-butylphenol). The complexes were characterized by elemental analyses and spectroscopic methods, and fully characterized by X-ray diffraction analysis. Single-crystal X-ray diffraction structure analysis of the complexes revealed that the manganese atom is octahedrally coordinated, where the bis(phenolate) ligand (bp²⁻) is N₂O₂-bonded to the Mn(III) center in a tetradentate dinegative fashion. The catalytic potential of these complexes has been tested for the oxidation of primary alcohols using H₂O₂ as the oxidant. The effects of various parameters, including the molar ratio of oxidant to substrate, the temperature and the solvent, have been studied. On comparing the catalytic activity of 1 and 2, catalyst 2 showed the most powerful activity in the oxidation of alcohols. Excellent conversions have been obtained for the oxidation of benzyl alcohols containing electron-donating groups at the para-position.

Bis(phenolate) ligands, Mn(III) complex, Catalytic oxidation, Crystal structure, Scorpion-like ligands, Oxidation of alcohols

http://dx.doi.org/10.1016/j.poly.2014.01.020

http://www.elsevier.com