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000873295 1001_ $$00000-0002-2369-9331$$aSchmolke, Laura$$b0
000873295 245__ $$aBimetallic Co/Al nanoparticles in an ionic liquid: synthesis and application in alkyne hydrogenation
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000873295 520__ $$aHerein, we report the microwave-induced decomposition of various organometallic cobalt and aluminum precursors in an ionic liquid (IL), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIm]NTf2), resulting in Co/Al nanoalloys with different molar Co/Al ratios. The dual-source precursor system of dicobalt octacarbonyl (Co2(CO)8) and pentamethylcyclopentadienyl aluminum ([AlCp*]4) in [BMIm]NTf2 afforded CoAl nanoparticles (CoAl-NPs) with a molar Co/Al ratio of 1 : 1. Their size and size distribution were determined via transmission electron microscopy (TEM) to be an average diameter of 3.0 ± 0.5 nm. Furthermore, the dual-source precursor system of cobalt amidinate ([Co(iPr2-MeAMD)2]) and aluminum amidinate [Me2Al(iPr2-MeAMD)] in molar ratios of 1 : 1 and 3 : 1 resulted in CoAl- and Co3Al-NPs with an average diameter of 3 ± 1 and 2.0 ± 0.2 nm, respectively. All the obtained materials were characterized via TEM, energy dispersive X-ray spectroscopy (EDX), selected area electron diffraction (SAED), together with high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and (high-resolution) X-ray photoelectron spectroscopy ((HR-)XPS). Phase-pure Co/Al-NPs were not obtained since the concomitant formation of Co-NPs and Al2O3 occurred in this wet-chemical synthesis. The as-prepared Co/Al nanoalloys were evaluated as catalysts in the hydrogenation of phenylacetylene under mild conditions (2 bar H2, 30 °C in THF). In comparison to the monometallic Co-NPs, the Co/Al-NPs showed a significantly higher catalytic hydrogenation activity. The Co- and Co/Al-NPs were also active under harsher reaction conditions (80 bar H2, 80 °C) without the addition of the activating co-catalyst DIBAL-H.
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000873295 7001_ $$0P:(DE-HGF)0$$aGregori, Bernhard J.$$b1
000873295 7001_ $$0P:(DE-HGF)0$$aGiesen, Beatriz$$b2
000873295 7001_ $$00000-0002-1075-4194$$aSchmitz, Alexa$$b3
000873295 7001_ $$0P:(DE-Juel1)130525$$aBarthel, Juri$$b4
000873295 7001_ $$0P:(DE-HGF)0$$aStaiger, Lena$$b5
000873295 7001_ $$00000-0002-7532-5286$$aFischer, Roland A.$$b6
000873295 7001_ $$00000-0001-7462-0745$$aJacobi von Wangelin, Axel$$b7$$eCorresponding author
000873295 7001_ $$00000-0002-6288-9605$$aJaniak, Christoph$$b8$$eCorresponding author
000873295 773__ $$0PERI:(DE-600)1472933-7$$a10.1039/C9NJ03622A$$gVol. 43, no. 42, p. 16583 - 16594$$n42$$p16583 - 16594$$tNew journal of chemistry$$v43$$x1369-9261$$y2019
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