Appl. Organomet. Chem., 18, 676-683 (2004).

© 2004 John Wiley & Sons, Ltd.

Flash Vacuum Thermolysis of 3,4-Dimethyl-1-germacyclopent-3-enes. UV Photoelectron Spectroscopic Characterization of GeH2 and GeMe2

Virginie Lemierre, Anna Chrostowska,* Alain Dargelos, Patrick Baylère, William J. Leigh,* and Cameron R. Harrington

Contribution from the Laboratoire de Physico-Chimie Moléculaire, UMR 5624, Université de Pau, BP1155 64013 Pau Cedex and the Department of Chemistry, McMaster University, Hamilton, ON  Canada  L8S 4M1

Abstract: Gas phase UV photoelectron spectra of germylene (GeH2) and its dimethyl analogue (GeMe2) have been recorded, after flash vacuum thermolysis of 3,4-dimethyl- and 1,1,3,4-tetramethylgermacyclopent-3-ene in the inlet of the photoelectron spectrometer. Lowest vertical ionisation bands for GeH2 (9.4 eV) and GeMe2 (8.2 and 10.0 eV) have been located with the aid of Time Dependent DFT calculations carried out at the B3LYP/6-311G(d,p) level of theory. Similar experiments carried out with 3,4-dimethyl-1,1-diphenylgermacyclopent-3-ene, in an attempt to record the PE spectrum of diphenylgermylene (GePh2), were less conclusive, but are consistent with the theoretically predicted lowest IP of 8.0-8.2 eV for GePh2. PES spectra of the three germacyclopentene derivatives are also reported.

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