“Donor–Acceptor” Oligogermanes: Synthesis, Structure, and Electronic Properties

Abstract

A series of oligogermanes, (Me 3 Si) 3 GeGeCl 3 , (C 6 F 5 ) 3 GeGePh 3 , (C 6 F 5 ) 3 GeGe(p-Tol) 3 , and (C 6 F 5 ) 2 Ge[Ge(p-Tol) 3 ] 2 , containing substituents with different electronic properties at neighboring germanium atoms were synthesized. According to X-ray diffraction studies, UV/visible spectroscopy, and quantum chemical calculations, these "donor−acceptor" oligogermanes are characterized by energies of electronic transitions lower than those for other similar compounds.

Tris(pentafluoroethyl)germane: Deprotonation and Hydrogermylation Reactions

“…The GeÀHb ond length of 146 (3) pm is comparable to the one in Ph 3 GeH (148(3) pm) [7] but elongated by 13 pm in comparison to (C 6 F 5 ) 3 GeH (133(3) pm). [8] The H-Ge-C bond angles range from 110.6(9)8 (C3) to 113.5(9)8 (C1). The averaged C-Ge-Cb ond angle (a ø = 1078)i ss lightly smaller than the tetrahedral angle.…”

“…The hydrogen atom was refined isotropically. Selectedbondlengths [ pm] and angles [8]: GeÀH1 46(3); H-Ge-C1 113.5 (9), H-Ge-C3 110.6(9), H-Ge-C5 111.4 (7), C1-Ge-C3 107.67(5), C1-Ge-C5 106.81 (5), C3-Ge-C5 106.51(5). Figure 2.…”

“…Thus, by treatment of [(C 2 F 5 ) 3 Ge] À salts with allyl bromide or 4-vinylbenzyl chloride, (5),G e-Ni-C8 106.89 (5), Ge-Ni-C9 104.57 (5),C 1-Ge-Ni-C8 À45.57 (7), C3-Ge-Ni-C9 À41.12 (8), C5-Ge-Ni-C7 À40.94 (8). The moleculars tructure of the styrene derivative 10 in the solid state was resolved by X-ray diffraction ( Figure 11).…”

Compounds of Group 14 Elements with an Element–Element (E = Si, Ge, Sn) Bond: Effect of the Nature of the Element Atom

“…The presence of byproduct (Me 3 Si) 4 Ge may be detected by NMR spectroscopy of the crude reaction mixture.…”

“…Introduction of electronwithdrawing substituents results in LUMO destabilization. 4 This leads to a bathochromic shift of the absorption band. 8e,20…”