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231223s2007 xx ||||| 00| ||eng c |
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|a pubmed24n0572.xml
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|a (DE-627)NLM171531981
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|a (NLM)17636989
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Nemana, Sailendra
|e verfasserin
|4 aut
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|a Chemistry of tantalum clusters in solution and on SiO2 supports
|b analogies and contrasts
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 17.09.2007
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|a Date Revised 08.08.2007
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Tantalum clusters have been synthesized from Ta(CH2Ph)5 on the surface of porous fumed SiO2. When these clusters are small, incorporating, on average, several Ta atoms, their chemistry is similar to that of molecular tantalum clusters (and other early transition-metal) clusters. For example, The Ta-Ta bonds in these small supported clusters have been characterized by extended X-ray absorption fine structure (EXAFS), IR, and UV-vis spectroscopy, being similar to those in molecular analogues. The redox reactions of the supported clusters, characterized by X-ray absorption near-edge structure, are analogous to those of early transition-metal clusters in solution. In contrast to the largest of these clusters in solution and in the solid state, those supported on SiO2 are raftlike, facilitating the substantial metal-support-oxygen bonding that is evident in the EXAFS spectra. Samples consisting of tantalum clusters on SiO2 catalyze alkane disproportionation and the conversion of methane with n-butane to give other alkanes, but catalytic properties of analogous clusters in solution have barely been explored
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|a Journal Article
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|a Okamoto, Norihiko L
|e verfasserin
|4 aut
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|a Browning, Nigel D
|e verfasserin
|4 aut
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| 700 |
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|a Gates, Bruce C
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 23(2007), 17 vom: 14. Aug., Seite 8845-54
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:23
|g year:2007
|g number:17
|g day:14
|g month:08
|g pages:8845-54
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|d 23
|j 2007
|e 17
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|h 8845-54
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