Über Polygermane. IV. Hexaphenyldigerman‐Dibenzol, eine Molekülstruktur mit Sandwich‐Packung

Abstract

Hexaphenyldigerman‐Dibenzol kristallisiert rhomboedrisch in der Raumgruppe R3 mit a = 1153,8(1) pm, c = 2581,8 (4) pm, Z = 3. In der Kristallstruktur ist jede Ge2Ph6‐Molekel von 8 Kristallbenzolmolekeln umgeben, von denen 2 die GeGe‐Einheit sandwich‐artig side‐on umfassen und jeweils 3 end‐on auf ein Germaniumzentrum weisen. Die Ge2Ph6‐Molekeln bilden achirale Doppelpropeller (Symmetric S6) mit einem GeGe‐Abstand von 244,6(1) pm. Dieser Abstand und analoge SnSn‐ und PbPb‐Abstände werden quantitativ mit der Steilheit der Phenylpropellerflügel korreliert.

Reaction of germanes and digermanes with triflic acid: The route to novel organooligogermanes

“…It is interesting to note that additional bands corresponding to p / p * transition in phenyl groups are less intensive and are overlapped with more intensive s / s * band or appeared as shoulders to corresponding bands [8]. It is evident that reported earlier UV/visible absorption for Ph 3 GeGePh 3 (240 nm) [10,26] was not correctly referred to s / s * band typical for GeeGe bond but corresponds to absorption of phenyl group.…”

“…The GeeGe distance in 7 (2.4635(12) Å) is somewhat longer than in parent compound Ph 3 GeGePh 3 (1) (Ph 3 GeGePh 3 (2.437(2) Å) [25], Ph 3 GeGePh 3 *2C 6 H 6 (2.446(1) Å) [26]). The latter may be caused by sterical requirements of the bridging triflate ligands.…”

Hydrogermolysis reactions involving the α-germylated nitriles R3GeCH2CN (R=Ph, Pri, But) and germanium amides R3GeNMe2 (R=Pri, But) with Ph3GeH: Substituent-dependent reactivity and crystal structures of Pri3GeGePh3 and But3Ge[NHC(CH3)CHCN]

“…The three sterically encumbering iso-propyl groups in 3 result in a Ge-Ge distance of 2.4637(7) Å , which is longer than the corresponding bond lengths in Me 3 GeGePh 3 (5, 2.418(1) Å ) [66], Et 3 GeGePh 3 (6, 2.4253(7) Å ) [60]. Bu n 3 GeGePh 3 (7, 2.4208(8) Å ) [60], and Ph 3 GeGePh 3 (2, 2.446(1) Å ) [32]. The average Ge-C aliphatic distance in 3 is 1.985(2) Å which is significantly longer than those of 5-7 which range from 1.943 to 1.959 Å .…”

Donor-acceptor molecular oligogermanes: Novel properties and structural aspects

“…Therefore, donor-acceptor oligogermanes may form crystals suitable to fix inert moleculesin a fashion similar to MOFs. Crystals of molecular oligogermanes containing solvated molecules are known, but only with molecules of solvated benzene or toluene (Ph3G3GePh3*2C6H6 [21] , (p-Tol)3GeGe(Tolp)3*C6H6 [22] , (p-Tol)3Ge-Ph3*C6H6, [(p-Tol)3Ge]2GePh2*PhMe, [(p-Tol)3Ge]2Ge(Tol-p)2*PhMe [23] , Ge4Ph10*2C6H6 [24] ).…”