Synthesis and purification of trimethylgallium for MOCVD: molecular structure of (KF)4·4(Me3Ga)
Kazimierz Starowieyski , Andrzej Chwojnowski , Krzysztof Jankowski , Janusz Lewiński , Janusz Zachara
AbstractTrimethylgallium was obtained from a 3:1 molar mixture of Me2AlCl (1) and GaCl3 (2) only in the presence of NaCl. The mechanism of the reaction was traced. It is postulated that the gallium–aluminium dimers ClnMe2−nAlCl2 GaClmMe2−m (m and n = 0, 1 or 2), formed in consecutive alkylation steps, do not participate in further alkyl–chlorine exchange. NaCl splits the dimers that form the precipitate of Na[MeAlCl3] (3), thus liberating MenGaCl3−n which, on further alkylation by Me2AlCl, finally yields Me3Ga. For an MOCVD application, it is purified through a complex with KF, which under vacuum decomposes at 180–300 °C, to yield a product contaminated by less than 1 ppm of the total impurities. The X-ray study of the complex reveals a tetrameric, highly symmetrical heterocubane of formula (KF)4·4(Me3Ga). Copyright © 2000 John Wiley \& Sons, Ltd.
|Journal series||Applied Organometallic Chemistry, ISSN 0268-2605, [1099-0739]|
|Keywords in English||alkylation, methylaluminium compounds, methylgallium compounds, MOCVD, X-ray structure|
|Publication indicators||= 10; = 12.0; : 2000 = 0.937; : 2006 = 1.233 (2) - 2007=1.238 (5)|
|Citation count*||12 (2015-04-26)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.