Tetrabenzylgermanium

Solid‐State 73Ge NMR Spectroscopy of Simple Organogermanes

“…This is consistent with the molecular structure in the solid state, for which the Ge center is located at a general position with no specific site symmetry. [21] The Ge À C bond lengths in 4 range from 1.946(6) to 1.973 (6) and the C-Ge-C angles range from 106.9(3) to 110.7(3)8. The distortion from ideal tetrahedral local geometry results in a notable EFG.…”

“…The span is twice of that 3 and the skew (k = 0.9) is consistent with the nonaxially symmetric environment around germanium observed in the molecular structure of the germane in the solid state. [21] To better understand the experimental results and to rationalize these results in light of available structural information, we carried out computational NMR studies. Previous computational studies of 73 Ge NMR parameters [11-12, 15, 22] have made use of the plane wave pseudopotential method in the CASTEP program, which has proven to be an excellent method to predict NMR tensor parameters of crystalline solids.…”

Reactions of GeCl2 with the Thiolate LiSC(SiMe3)3: From thf Activation to Insertion of GeCl2 Molecules into C−S Bonds

“…This orientation could be clarified by a distinct identification of the hydrogen‐atom positions of the thf molecule after solving some twinning problems during data collection . This bonding motif of the thf molecule clearly shows that thf is not only the solvent during the reaction but also acts as a reactant, thus leading to a Ge−C σ bond of 197.0 pm, which is comparable to a normal Ge IV −C single bond as found in Ge(CH 2 Ph) 4 (196 pm), for example . Owing to the bonding of the thf molecule through the carbon atom, all remaining hydrogen atoms of the former thf molecule have a different chemical environment, which should result in seven signals within the proton NMR spectrum.…”

“…[21] This bondingm otif of the thf molecule clearly shows that thf is not only the solvent during the reactionb ut also acts as ar eactant,t hus leading to aG e ÀC s bond of 197.0 pm, which is comparable to an ormalG e IV ÀC single bond as found in Ge(CH 2 Ph) 4 (196 pm), for example. [22] Owingt ot he bonding of the thf molecule throught he carbon atom,a ll remainingh ydrogen atoms of the former thf molecule have ad ifferent chemical environment, which should result in seven signals within the proton NMR spectrum. The protonN MR spectrum of dissolved crystals of 3 ( Figure 5) indeeds hows seven signals in the range of d = 1.5 to 4.9 ppm, which all gave an integral ratio of abouto ne hydrogen atom.…”

Characterization, Crystal Structure and Initial DNA Binding Mechanism Research of Multi‐nuclear Homometallic Complexes of 4,5‐Diazafluoren‐9‐one with Copper(II) and Cobalt(II)

“…The coordination unit composed of four acetic acid radicals bridged binuclear coppers is centrosymmetric, and its configuration is invariable. 15 Cages are composed of the coordination units and the cages propagate as a linear chain whose repeat units are held together by hydrogen bonds. In the linear chain structure, the dafo molecules are parallel to each other and the cages are also parellel to each other.…”