Magnetically Recoverable Catalysts Based on Polyphenylenepyridyl Dendrons and Dendrimers

Here, a systematic study of magnetite nanoparticle (NP) formation in the presence of functional polyphenylenepyridyl dendrons and dendrimers of different generations and structures (such as focal groups, periphery and a combination of phenylene and pyridyl moieties) has been reported. For certain de...

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Bibliographic Details
Published in:RSC advances 2014-01, Vol.4 (44), p.23271-23280
Main Authors: Yuzik-Klimova, E. Yu, Kuchkina, N. V., Sorokina, S. A., Morgan, D. G., Boris, B., Nikoshvili, L. Zh, Lyubimova, N. A., Matveeva, V. G., Sulman, E. M., Stein, B. D., Mahmoud, W. E., Al-Ghamdi, A. A., Kostopoulou, A., Lappas, A., Shifrina, Z. B., Bronstein, L. M.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Crystal structure
Dendrimers
Formations
Hydrogenation
Magnetite
Selectivity
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Summary:Here, a systematic study of magnetite nanoparticle (NP) formation in the presence of functional polyphenylenepyridyl dendrons and dendrimers of different generations and structures (such as focal groups, periphery and a combination of phenylene and pyridyl moieties) has been reported. For certain dendron/dendrimer concentrations and structures, well-dispersible, multi-core, flower-like crystals are formed which display ferrimagnetic-like behavior. It is noteworthy that the least complex second generation polyphenylenepyridyl dendrons with a carboxyl focal group already allow formation of flower-like crystals. Magnetically recoverable catalysts were obtained viaPd NP formation in the dendron/dendrimer shells of magnetite NP and tested in selective hydrogenation of dimethylethynylcarbinol to dimethylvinylcarbinol. Dependences of catalytic activity and selectivity on the dendron/dendrimer generation and structure, type of Pd species, and Pd NP size have been demonstrated. High selectivity and activity of these catalysts along with easy catalyst recovery and successful repeated use make them promising in catalytic hydrogenation.
ISSN:2046-2069
2046-2069
DOI:10.1039/c4ra00878b