(η2-Me4C5H)Me2Si(η5-Me4C5)Ge+ GeCl3−:

Germanium-Containing Heterobicyclic 10-π-Electron Ring Systems. Synthesis and Characterization of Neutral and Cationic Germanium(II) Derivatives of Aminotroponiminates

“…Similar interactions in the Sn(II) cation lead to centrosymmetric dimers. 32 26 The Cl6‚‚‚Ge‚‚‚Cl1A angle is 169.8°. It is also noteworthy that the Ge‚‚‚Cl contacts of 7 are even longer than the Sn‚‚‚Cl separations of the tin analog (2.979 and 3.070 Å).…”

“…7,8,[20][21][22][23] In contrast to the neutral germylenes (e.g., 1-4), related cationic germanium(II) complexes are rare. 1 A small number of such species having cyclopentadienyl ligands (e.g., {[η 5 -C 5 Me 5 ]Ge}X, where X ) [BF 4 ], [CF 3 SO 3 ], and [AlCl 4 ]; 24,25 {[η 2 -Me 4 C 5 H]Me 2 Si[η 5 -Me 4 C 5 ]Ge}[GeCl 3 ]), 26,27 arenes (e.g., [(p-C 6 H 4 CH 2 CH 2 ) 3 GeCl] 2 [Al 4 O 2 Cl 10 ]), 28 and nitrogen donors (e.g., [Ge 2 (3,5-(CH 3 ) 2 Pz) 3 ][GeCl 3 ] 29 and {[HB(3,5-(CH 3 ) 2 Pz) 3 ]-Ge}I) 30 have been reported in the literature. One area of focus in our laboratory is the chemistry of N-alkyl-2-(alkylamino)troponiminate ([(R) 2 ATI] -) derivatives of main group elements.…”

Crystal Structure of a Silicon-Bridged Anionic Sodocene Complex: Evidence for Alkene−Na+ π-Bonding

“…(iv) Comparison of the structure of [(allyl) 2 Si(C 5 H 4 ) 2 Na] - with the structures of the half-sandwich complexes of Ge ( 7 ) and Sn ( 8 ) shows that all three structures contain a subunit, CC−C−Si−CpM, in which the alkene π-system is directed toward the metal. The alkene−M distances in all three complexes show a striking similarity (Ge···C distances, 3.18(1) and 3.34(1) Å; Sn···C distances, 3.169(6) and 3.301(1) Å; Na···C distances, 3.149(5) and 3.343(5) Å).…”

Germanium Organometallic Compounds: Classification and Analysis of Crystallographic and Structural Data

“…The Ge-C(caitroid) distance is 189.7 pm. Another yellow derivative [179] has a pentagonal bipyramidal penta-hapto cation and a GeCl 3 anion. The mean Ge-C distance of 228(2) pm and Ge-C(centroid) distance of 193 pm are somewhat longer than in the previous case In all, forty eight remaning derivatives in Table 4 have five doner atoms about theGe([V) atom to give a trigonal bipyramidal geometry with varying degrees of distortion.…”

“…The data in Table 4 shows that Ge(II) occurs with pentahapto C-donor ligaids (hemi-sandwiched) in a pentagonal geometry [20,179] There are three examples [204,205,211] whidi contain two ciystallogiaphically independent molecules in one crystal. These differ mostly by degree of distortion and represent distortion isomerism [11}…”