Magnetically Recoverable Catalysts Based on Polyphenylenepyridyl Dendrons and Dendrimers

E. Yu. Yuzik-Klimova; N. V. Kuchkina; S. A. Sorokina; D. G. Morgan; B. Boris; L. Zh. Nikoshvili; N. A. Lyubimova; V. G. Matveeva; E. M. Sulman; B. D. Stein; W. E. Mahmoud; A. A. Al-Ghamdi; A. Kostopoulou; A. Lappas; Z. B. Shifrina; L. M. Bronstein

doi:10.1039/C4RA00878B

Magnetically Recoverable Catalysts Based on Polyphenylenepyridyl Dendrons and Dendrimers†

E. Yu. Yuzik-Klimova,^a N. V. Kuchkina,^a S. A. Sorokina,^a D. G. Morgan,^b B. Boris,^b L. Zh. Nikoshvili,^c N. A. Lyubimova,^c V. G. Matveeva,^c E. M. Sulman,^c B. D. Stein,^d W. E. Mahmoud,^e A. A. Al-Ghamdi,^e A. Kostopoulou,^f A. Lappas,^f Z. B. Shifrina*^a and L. M. Bronstein*^be

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* Corresponding authors

^a A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., Moscow, Russia

^b Indiana University, Department of Chemistry, Bloomington, IN 47405, USA
E-mail: lybronst@indiana.edu

^c Tver State Technical University, Department of Biotechnology and Chemistry, 22 A. Nikitina St, Tver, Russia

^d Indiana University, Department of Biology, Bloomington, IN 47405, USA

^e King Abdulaziz University, Faculty of Science, Department of Physics, Jeddah, Saudi Arabia

^f Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, Heraklion, Crete, Greece

Abstract

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 via Pd 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.

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Magnetically Recoverable Catalysts Based on Polyphenylenepyridyl Dendrons and Dendrimers†

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Magnetically Recoverable Catalysts Based on Polyphenylenepyridyl Dendrons and Dendrimers

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