ISSN:
0947-6539
Keywords:
clusters
;
EXAFS spectroscopy
;
Grignard reactions
;
magnesium
;
platinum
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The „platinum Grignard reagent“ [Pt(MgCl)2(THF)x] (2), obtained by the reaction of PtCl2 and Et2Mg in a 1:2 molar ratio, as well as finely divided platinum (Pt*) - a possible intermediate formed during the preparation of 2 - have been investigated by EXAFS spectroscopy at the PtLII edge. Parallel investigations were carried out on Pt* obtained from PtCl2 and (9,10-dihydro-9,10-an-thracenediyl)tris(tetrahydrofuran)magnesium (MgA), and on 2 obtained from Pt*, MgA, and MgCl2. The EXAFS results suggest that Pt* consists of extremely small particles (≈ 5-11 Å) with strongly reduced Pt-Pt distances compared to bulk Pt (≈ 0.09 Å). The EXAFS spectra of 2 indicate the presence of Mg shells in addition to Pt shells in the Pt environment; Mg atoms are at a bonding distance from Pt atoms (2.78-2.80 Å). These results suggest that 2 consists of very small Pt-Mg clusters and confirm their formation from organomagnesium reagents and PtCl2 or Pt*.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/chem.19970031020
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