Chemistry - A European Journal p. 1710 - 1718 (1997)
Update date:2022-08-11
Topics:
Aleandri, Lorraine E.
Bogdanovic, Borislav
Duerr, Christine
Huckett, Sara C.
Jones, Deborah J.
Kolb, Uwe
Lagarden, Martin
Roziere, Jacques
Wilczok, Ursula
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 Pt L(III) edge. Parallel investigations were carried out on Pt* obtained from PtCl2 and (9,10-dihydro-9,10-anthracenediyl)tris(tettrahydrofuran)magnesium (MgA), and on 2 obtained from Pt* MgA, and MgCl2. The EXAFS results suggest that Pt* consists of extremely small particles (? 5-11 A) with strongly reduced Pt-Pt distances compared to bulk Pt (?0.09 A). 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 A). These results suggest that 2 consists of very small Pt-Mg clusters and confirm their formation from organomagnesium reagents and PtCl2 or Pt*.
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