title: A Free Cyclotrigermenium Cation with a 2pi-Electron System
abstract: The reaction of tetrakis(tri-tert-butylsilyl)cyclotrigermene with trityl tetraphenylborate in benzene produces tris(tri-tert-butylsilyl)cyclotrigermenium tetraphenylborate [(tert-Bu3SiGe)3+BPh4-], which can be isolated as a yellow solid that is stable in the absence of air. The crystal structure of the cyclotrigermenium ion reveals a free germyl cation with a 2pi-electron system. The three germanium atoms form an equilateral triangle similar to the carbon analog, the cyclopropenium ion.
authors.affiliation: A. Sekiguchi, Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305, Japan. M. Tsukamoto and M. Ichinohe, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-77, Japan.
authors.initials: A
authors.lastname: Sekiguchi
authors.initials: M
authors.lastname: Tsukamoto
authors.initials: M
authors.lastname: Ichinohe