|
|
|
|
| LEADER |
01000caa a22002652c 4500 |
| 001 |
NLM211786063 |
| 003 |
DE-627 |
| 005 |
20250213063351.0 |
| 007 |
cr uuu---uuuuu |
| 008 |
231224s2011 xx |||||o 00| ||eng c |
| 024 |
7 |
|
|a 10.1021/la203066d
|2 doi
|
| 028 |
5 |
2 |
|a pubmed25n0706.xml
|
| 035 |
|
|
|a (DE-627)NLM211786063
|
| 035 |
|
|
|a (NLM)21951192
|
| 040 |
|
|
|a DE-627
|b ger
|c DE-627
|e rakwb
|
| 041 |
|
|
|a eng
|
| 100 |
1 |
|
|a Biradar, Ankush V
|e verfasserin
|4 aut
|
| 245 |
1 |
0 |
|a Silica-dendrimer core-shell microspheres with encapsulated ultrasmall palladium nanoparticles
|b efficient and easily recyclable heterogeneous nanocatalysts
|
| 264 |
|
1 |
|c 2011
|
| 336 |
|
|
|a Text
|b txt
|2 rdacontent
|
| 337 |
|
|
|a ƒaComputermedien
|b c
|2 rdamedia
|
| 338 |
|
|
|a ƒa Online-Ressource
|b cr
|2 rdacarrier
|
| 500 |
|
|
|a Date Completed 27.03.2012
|
| 500 |
|
|
|a Date Revised 21.11.2013
|
| 500 |
|
|
|a published: Print-Electronic
|
| 500 |
|
|
|a Citation Status MEDLINE
|
| 520 |
|
|
|a © 2011 American Chemical Society
|
| 520 |
|
|
|a We report the synthesis, characterization, and catalytic properties of novel monodisperse SiO(2)Pd-PAMAM core-shell microspheres containing SiO(2) microsphere cores and PAMAM dendrimer-encapsulated Pd nanoparticle (Pd-PAMAM) shells. First, SiO(2) microspheres, which were prepared by the Stöber method, were functionalized with vinyl groups by grafting their surfaces with vinyltriethoxysilane (VTS). The vinyl groups were then converted into epoxides by using m-chloroperoxybenzoic acid. Upon treatment with amine-terminated G4 poly(amidoamine) (PAMAM) dendrimers, the SiO(2)-supported epoxides underwent ring-opening and gave SiO(2)@PAMAM core-shell microspheres. Pd nanoparticles within the cores of the SiO(2)-supported PAMAM dendrimers were synthesized by letting Pd(II) ions complex with the amine groups in the cores of the dendrimers and then reducing them into Pd(0) with NaBH(4). This produced the SiO(2)@Pd-PAMAM core-shell microspheres. The presence of the different functional groups on the materials was monitored by following the changes in FTIR spectra, elemental analyses, and weight losses on thermogravimetric traces. Transmission electron microscopy (TEM) images showed the presence of Pd nanoparticles with average size of 1.56 ± 0.67 nm on the surface of the monodisperse SiO(2)@Pd-PAMAM core-shell microspheres. The SiO(2)@Pd-PAMAM core-shell microspheres were successfully used as an easily recyclable catalyst for hydrogenation of various olefins, alkynes, keto, and nitro groups, giving ~100% conversion and high turnover numbers (TONs) under 10 bar H(2) pressure, at room temperature and in times ranging from 10 min to 3 h. In addition, the SiO(2)@Pd-PAMAM core-shell microspheres were proven to be recyclable catalysts up to five times with barely any leaching of palladium into the reaction mixture
|
| 650 |
|
4 |
|a Journal Article
|
| 650 |
|
4 |
|a Research Support, U.S. Gov't, Non-P.H.S.
|
| 650 |
|
7 |
|a Capsules
|2 NLM
|
| 650 |
|
7 |
|a Dendrimers
|2 NLM
|
| 650 |
|
7 |
|a Palladium
|2 NLM
|
| 650 |
|
7 |
|a 5TWQ1V240M
|2 NLM
|
| 650 |
|
7 |
|a Silicon Dioxide
|2 NLM
|
| 650 |
|
7 |
|a 7631-86-9
|2 NLM
|
| 700 |
1 |
|
|a Biradar, Archana A
|e verfasserin
|4 aut
|
| 700 |
1 |
|
|a Asefa, Tewodros
|e verfasserin
|4 aut
|
| 773 |
0 |
8 |
|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 27(2011), 23 vom: 06. Dez., Seite 14408-18
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
|
| 773 |
1 |
8 |
|g volume:27
|g year:2011
|g number:23
|g day:06
|g month:12
|g pages:14408-18
|
| 856 |
4 |
0 |
|u http://dx.doi.org/10.1021/la203066d
|3 Volltext
|
| 912 |
|
|
|a GBV_USEFLAG_A
|
| 912 |
|
|
|a SYSFLAG_A
|
| 912 |
|
|
|a GBV_NLM
|
| 912 |
|
|
|a GBV_ILN_22
|
| 912 |
|
|
|a GBV_ILN_350
|
| 912 |
|
|
|a GBV_ILN_721
|
| 951 |
|
|
|a AR
|
| 952 |
|
|
|d 27
|j 2011
|e 23
|b 06
|c 12
|h 14408-18
|