Insight into the Decomposition Mechanism of Donor–Acceptor
Complexes of EH2 (E = Ge and Sn) and Access to Germanium
Thin Films from Solution
Posted on 2020-07-20 - 12:38
Electron-donating N-heterocyclic carbenes (Lewis
bases, LB) and electron-accepting Lewis acids (LA) have been used
in tandem to yield donor–acceptor complexes of inorganic tetrelenes
LB·EH2·LA (E = Si, Ge, and Sn). Herein, we introduce
the new germanium (II) dihydride adducts ImMe2·GeH2·BH3 (ImMe2 = (HCNMe)2C:) and ImiPr2Me2·GeH2·BH3 (ImiPr2Me2 =
(MeCNiPr)2C:), with the former complex containing
nearly 40 wt % germanium. The thermal release of bulk germanium from
ImMe2·GeH2·BH3 (and its
deuterated isotopologue ImMe2·GeD2·BD3) was examined in solution, and a combined kinetic and computational
investigation was undertaken to probe the mechanism by which Ge is
liberated. Moreover, the thermolysis of ImMe2·GeH2·BH3 in solution cleanly affords conformal
nanodimensional layers of germanium as thin films of variable thicknesses
(20–70 nm) on silicon wafers. We also conducted a computational
investigation into potential decomposition pathways for the germanium(II)-
and tin(II)-dihydride complexes NHC·EH2·BH3 (NHC = [(HCNR)2C:]; R = 2,6-iPr2C6H3 (Dipp), Me, and H; and E = Ge and
Sn). Overall, this study introduces a mild and convenient solution-only
protocol for the deposition of thin films of Ge, a widely used semiconductor
in materials research and industry.
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Sinclair, Jocelyn; Dai, Guoliang; McDonald, Robert; Ferguson, Michael J.; Brown, Alex; Rivard, Eric (2020). Insight into the Decomposition Mechanism of Donor–Acceptor
Complexes of EH2 (E = Ge and Sn) and Access to Germanium
Thin Films from Solution. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.0c01492
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AUTHORS (6)
JS
Jocelyn Sinclair
GD
Guoliang Dai
RM
Robert McDonald
MF
Michael J. Ferguson
AB
Alex Brown
ER
Eric Rivard
KEYWORDS
BDBHelectron-accepting Lewis acidsIm i Pr 2ImMe 2heterocyclic carbenesGematerials researchHCNRinvestigationSolution Electron-donating Nconformal nanodimensional layersMeCN i Prbulk germaniumsolution-only protocolGeHLewis basesSndecomposition pathwaysfilmLBNHCLAcomplexDecomposition MechanismIIEH 2silicon wafers