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- Title
Investigation of catalytic properties of two new orthopalladated complexes supported on montmorillonite: Synthesis, characterization and application in aerobic oxidation of alcohols.
- Authors
Karami, Kazem; Hashemi, Sara; Dinari, Mohammad
- Abstract
Two new complexes, [Pd(L1)(C,N)]NO3 ( 1) and [Pd(L2)(C,N)]NO3 ( 2) (L1 = 5-nitro-1,10-phenanthroline, L2 = 4-methyl-1,10-phenanthroline, C,N = benzylamine), have been synthesized and characterized using infrared and NMR spectroscopies and elemental analysis. Montmorillonite (MMT-K10 clay) was used as a solid support for incorporating the cationic part of complexes 1 and 2 to produce catalysts 1 and 2, respectively, as heterogeneous catalysts. Catalyst 1 was identified using powder X-ray diffraction and scanning and transmission electron microscopies, and the content of palladium obtained from inductively coupled plasma analysis. By changing the electron-donating group on the L1 ligand with an electron-withdrawing one, a minor improvement was observed in the catalytic properties. Catalyst 1 showed better efficiency for oxidation of benzyl alcohol in comparison with catalyst 2, so catalyst 1 was used for the aerobic oxidation of alcohols to corresponding aldehydes or ketones without over-oxidation (with and without bubbling of air). This catalytic system showed high activity towards alcohols under mild conditions. Finally, the reusability of catalyst 1 was investigated with multiple reuses of the supported catalyst in subsequent alcohol oxidation reactions.
- Subjects
PALLADIUM catalysts; METAL complexes; MONTMORILLONITE; COMPLEX compounds synthesis; ALCOHOL oxidation
- Publication
Applied Organometallic Chemistry, 2017, Vol 31, Issue 8, pn/a
- ISSN
0268-2605
- Publication type
Article
- DOI
10.1002/aoc.3672