Cations germanium

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 characteristic structural features of two-coordinate low-valent germanium cation 276 are similar to those of the analogous Si cation 268 discussed above. The average C—N and C—C bond distances (1.348 A and 1.392 A, respectively) and the essentially planar ring indicate aromatic delocalization.691 In contrast, however, the y-CH proton (8 H 4.23) is more shielded. The aromatic substituents are perpendicular to the GeN2C3 plane. 

Results from gas chemisorption, catalytic testing, and TPR and TPD experiments demonstrate that after H2 reduction at 773 K a part of tin (germanium) cations reduces and forms a metallic Pt-Sn(Ge) alloy. Alloying does not increase the thiotolerance of Pt-Sn catalysts compared to monometallic Pt catalyst. On the contrary, alloying enhances the thiotolerance of Pt in Pt-Ge catalysts because the formation of Pt-Ge clusters changes the electronic properties of Pt, via electron withdrawal by the reduced Ge ions. 

Silicon-, Germanium-, and Tin-Centered Cations, Radicals, and Anions ... 

SILICON-, GERMANIUM-, AND TIN-CENTERED CATIONS, RADICALS, AND ANIONS... 

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