- Aryl Oligogermanes as Ligands for Transition Metal Complexes
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The ligand properties of a series of aryl oligogermanes R3Ge-GeAr3, 3–7 [Me3Ge-GePh3 (3), Me3Ge-Ge(pTol)3 (4), Ph3Ge-GePh3 (5), (C6F5)3Ge-GePh3 (6), Ph3Ge-GeMe2GePh3 (7)] for the synthesis of transition metal carbonyl complexes such as R3Ge-GeAr2(R′C6H4-η6)M(CO)3 (M = Cr, 3a–7a; M = Mo, 3b; M = W, 3c) were investigated. The target complexes were obtained in moderate yields using several different synthetic approaches. The physicochemical properties of these new derivatives were investigated by IR, UV/Vis, NMR spectroscopy, electrochemistry, and DFT calculations. The molecular structures of 3c, 4a, and 5a were studied by single-crystal X-ray diffraction analysis. A comparative analysis of donor and acceptor properties of aryl oligogermanes as ligands for transition metal carbonyl complexes is reported.
- Zaitsev, Kirill V.,Lam, Kevin,Tafeenko, Viktor A.,Korlyukov, Alexander A.,Poleshchuk, Oleg Kh.
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- UEBER POLYGERMANE. XV. DARSTELLUNG VON PHENYLIERTEN TRIGERMANEN IN HMPT
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The optimum conditions for the synthesis of the trigermanes Ge3Ph8 and Ge3Me2Ph6 according to R2GeCl2 + 2 Ph3GeAk (Ak = Li, K) in HMPT have been determined.The main difficulty is to repress a nucleophilic attack of Ph3Ge- at newly formed Ge-Ge bonds.The mass spectrum of Ge3Me2Ph6 shows rearrangements of the GePh3 and Ph/Me groups.The 13C NMR phenyl signals of di-, tri- and tetra-germanes are nearly identical.Ge3Ph8 and Ge4Ph10 transform to the plastically-crystalline state before melting (ΔH 45.3 and 54.9 kJ mol-1).The crystal structure of Ge3Me2Ph6 has been determined.The molecule has C2 symmetry (Ge-Ge 242.9(1) pm, Ge-Ge-Ge 120.3(1) deg).
- Draeger, Martin,Simon, Dietolf
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