UV excimer laser photochemistry of hybrid organometallic compounds of gallium

✍ Scribed by Y. Zhang; W. M. Cleaver; M. Stuke; A. R. Barron

• Book ID: 104733694
• Publisher: Springer
• Year: 1992
• Tongue: English
• Weight: 609 KB
• Volume: 55
• Category: Article
• ISSN: 1432-0630
• DOI: 10.1007/bf00348395

✦ Synopsis

The gas phase ultraviolet (UV) excimer laser induced photolysis of the gallium-alkyls Ga(t-C4Hg), -(CH3)3_ . (n=0, 1,2, 3) was studied, using photolysis wavelengths of 308, 248, and 193 nm. The photofragments Ga, Gall, and GaCH3 were detected by laser ionization time-of-flight mass spectroscopy, while the hydrocarbon products CH4, C2H 6, H C ( C H 3 ) 3 and HzC=C(CH3) 2 were identified using Fourier transform infrared (FTIR) spectroscopy. The formation of the Gall photofragment, and a high olefin-to-alkane product ratio, for Ga(t-C4H9)2(CH3) and Ga(t-C4H9) 3 are interpreted to indicate a /3-hydrogen elimination process. However, //-hydrogen elimination only occurs after fission of the weakest G a -C bond, thus no/3-hydride elimination is observed for Ga(t-C4H9)(CH3) 2. Detection of C2H 6 for Ga(CH3) 3 and Ga(t-C4H9)(CH3)2, but not for Ga(t-C4H9)2(CH3), shows that under our experimental conditions the formation of ethane is as a result of the reductive elimination of the methyl groups, and is not due to the recombination of two free methyl radicals.