Size and Shape Variation of Polyphenylene Dendrimers through the Heterogeneous Hydrogenation of Embedded Triple Bonds
| Autor: | Joachim Bargon, Roland E. Bauer, Martin Baumgarten, Ekaterina V. Andreitchenko, Klaus Müllen, Christian Kreutz |
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| Rok vydání: | 2008 |
| Předmět: |
Polymers and Plastics
Organic Chemistry Heterogeneous catalysis Triple bond Branching (polymer chemistry) Inclusion compound Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering Dendrimer Polymer chemistry Tetraphenylcyclopentadienone Materials Chemistry Molecule Diphenylacetylene |
| Zdroj: | Macromolecules. 41:548-558 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Different generation polyphenylene dendrimers possessing eight diphenylacetylene units in the dendritic scaffold between the layers of the first and second generation have been synthesized by using a new p-phenylene ethynylene-functionalized tetraphenylcyclopentadienone branching unit. The heterogeneous hydrogenation of the embedded triple bonds in the final dendrimers was successfully performed via heterogeneous catalysis. Moreover a “softening” effect of the dendritic structure in consequence of the hydrogenation is observed, allowing for the first time the investigation of this effect upon size, shape, and intramolecular voids in the case of similar dendrimer pairs. Quartz microbalance studies revealed that upon hydrogenation the capacity in host uptake is decreased allowing the incorporation of a lower number of guest molecules compared to the parent materials. |
| Databáze: | OpenAIRE |
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