Über polygermane

Rationally Functionalized Deltahedral Zintl Ions: Synthesis and Characterization of [Ge9ER3]3−, [R3EGe9ER3]2−, and [R3EGe9Ge9ER3]4− (E=Ge, Sn; R=Me, Ph)

“…They compare well with 2.599 ä for Ge À Sn in Me 3 GeSnPh 3 and with 2.438 and 2.441 ä for GeÀGe in [Ph 3 GeÀGe(Ph) 2 À GePh 3 ]. [13,14] The effect of the bridging in 4 and the associated three-center±two-electron interaction are clearly manifested in the longer SnÀGe distances of 2.940 and 2.985 ä. Although the trimethyltin substituent in 5 is not exactly bridging, it is noticeably bent towards the threefold axis of the prism and brings the tin atom close to the other two germanium atoms of the triangular base Ge2 and Ge3 …”

Structural, spectral, and electrochemical investigations of para-tolyl-substituted oligogermanes

“…The average GeeGe bond distance in 2$C 7 H 8 is 2.4328(5) Å, which is shorter than the average GeeGe bond length in Ge 3 Ph 8 (6, 2.440(2) Å) [39] but is similar to the average GeeGe bond distance of 2.429(1) in Ph 3 GeGeMe 2 GePh 3 (7) [69]. However, the contraction of the GeeGe bond lengths in 2$C 7 H 8 compared to those in 6 is not as pronounced as that observed between 1$2C 6 H 6 and Ph 3 GeGePh 3 , further suggesting that interplay of electronic and steric effects in the trigermane 2$C 7 H 8 have a combined effect on the GeeGe bond distance.…”

“…However, the contraction of the GeeGe bond lengths in 2$C 7 H 8 compared to those in 6 is not as pronounced as that observed between 1$2C 6 H 6 and Ph 3 GeGePh 3 , further suggesting that interplay of electronic and steric effects in the trigermane 2$C 7 H 8 have a combined effect on the GeeGe bond distance. The GeeGeeGe bond angle at Ge(2) in 2$C 7 H 8 measures 114.80 (2) , which is more acute that those in both 6 (121.3(1) ) [39] and 7 (120.3(1) ) [69] but is similar to those in the halide-substituted trigermanes XBu t 2 GeGeBu t 2 GeBu t 2 X (X ¼ Br [72], 113.6(1) ; X ¼ I [71], 115.4(1) ). The C(22)eGe(2)eC (28) bond angle in 2$C 7 H 8 which measures 106.2(1) is also more acute than the corresponding bond angle at the central germanium atom in both 6 (108.7(4) ) [39] and 7 (109.2(2) ) [69], which can be attributed to the steric effects of the six terminal tolyl groups.…”

Synthesis, Structure and Bonding in Triorganogermyl-alanes and Triphenylgermyl-aluminates

“…11) as very thin platelets which were not suitable for a crystal structure determination. However, when tmp 2 AlCl was used instead of the bromide in toluene/diethyl ether as solvent, the crystals that separated after several weeks proved to be octaphenyl-trigermane, which was characterized by its crystal structure [23,24]. This compound might have formed by a decomposition of 8, as shown in Eq.…”