Room temperature observation of GeH2 and the first time-resolved study of some of its reactions

Ab initio calculations of the structures and energies of Ge(CH3)2 from tetramethylgermane in CVD

“…The B3LYP/6-311G* model, on the other hand, appears to overestimate the energy gap, in comparison to the available data. This has been reported in another third-row computational study that also suggests the use of the Perdew functional for these elements [5]. Looking at the single-point calculations in Table 5, one observes that the predicted energy gaps are essentially identical to those resulting from full optimization.…”

“…Germanium containing radicals are postulated as intermediates in the CVD process [2]. Recently, the first experimental information [3][4][5] for GeH 2 appeared in the literature, and a number of ab initio calculations, at varying levels of theory, have been reported for this radical [6][7][8]. However, there is no spectroscopic or kinetic information for other germanium hydrides, nor has any data been reported for dialkylgermanium radicals.…”

Rate constants for the gas-phase reactions of germylene with CH3OCH3, CH3OH, CD3OD and D2O at ambient temperature

“…4 In 1996, Becerra et al reported the first direct measurements of reaction rate constants for GeH 2 . 5 These gas-phase measurements involved GeH 2 reacting with O 2 , trimethylsilane, acetylene, i-butylene and propane at room temperature. Since this initial report, Walsh's group has extended its studies and we have also reported rate constants for GeH 2 reactions with a number of species.…”

“…5 The experiment is performed under conditions such that the reactions are pseudo-first order. To minimise non-germylene contributions to the signal, two sets of decay traces are recorded, one with the laser tuned to a GeH 2 absorption (signal) and one with the laser detuned from GeH 2 (background).…”

Gas‐Phase Chemistry and Mass Spectrometry ofGe‐,Sn‐ andPb‐Containing Compounds

“…The rate constants for the reaction of GeH 2 , generated by laser flash photolysis from either PhGeH 3 or 3,4-dimethylgermacyclopentane, with O 2 , C 2 H 2 , i-C 4 H 8 , 1,3-C 4 H 6 , C 3 H 8 and Me 3 SiH has been recently determined by time-resolved laser induced fluorescence 234 . Analysis of the end products for the reaction with 2,3-dimethyl-1,3-butadiene reveals addition of GeH 2 onto the double bond to yield 3,4-dimethylgermacyclopentane, as shown in Scheme 16.…”