Germanium, tris structure

Germanium, eyclopentadienyl-, 3, 218 Germanium, tris(acetyiacetone)-structure, 1, 65 Germanium alkoxides physical properties, 2, 346 Germanium complexes, 3,183-223 acetylacetone isomerization, 2,383 bivalent... 

Several reviews appeared on the heavier congeners of the carbenium ions. Clearly, the silylium ion problem has received the most attention, and both theoretical as well as experimental aspects have been reviewed. The chemistry of cationic germanium, tin and lead is covered by a recent review by Zharov and Michl. We will concentrate in this review on the description of the progress made during the last 4 years and will try to give an account on the synthesis, the properties and the structure of organosubstituted three-coordinated, tiivalent group 14 element cations and closely related species in the condensed phase. 

It should also be noted here that recent work in Japan has shown that a free germanium cation can be prepared and structurally characterized. Thus, the reaction of tetrakis (tri-z-butylsilyl)cyclotrigermene with trityl tetraphenylborate affords (t-Bu3SiGe)3+ BPI14 as a yellow crystalline solid. X-ray crystallography shows that there is no close interaction between the anion and the cation. The stability of the compound is presumably due not only to the steric protection afforded by the bulky t-BtcSi substituents, but also to the fact that it contains a 2jr-electron aromatic ring.198... 

The first tris(pyrazolyl)borohydride complex of germanium(II) was prepared directly from K[HB(3,5-Me2-pz)3] and GeCl2 diox and isolated as its iodide [K -HB(3,5-Me2-pz)3Ge]I and cyanide salts.The solid-state structure of the iodide reveals well separated germanium containing cations and iodide anions, and that the geometry at the germanium is distorted tetrahedral, with the lone pair occupying the fourth vertex. 

Stable germaneselenones 52 and 53, congeners of ketones, were presented and structurally characterized (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]-phe-nyl. Tip = 2,4,6-tris(isopropyl)phenyl) and Dis = bis(trimethylsilyl)methyl) (Scheme 12). These high-frequency resonances support the interpretation of a ketone-analogous sp -hybridized germanium atom with germanium-selenium... 

Woshin YZ, Korobko SV, Dolganov AV, Novikov W, Wogzhanina AV, Bubnov YN (2011) New types of the germanium-capped clathrochelate ii[Pg.137]

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