title: Bis(tri-tert-butylsilyl)silylene: triplet ground state silylene.
abstract: Upon irradiation with lambda = 254 nm light over the temperature range of 9-80 K, methylcyclohexane glass matrixes of 1a and 1b gave a characteristic broad EPR signal at 845 mT (X-band, 9.4 GHz) due to bis(tri-tert-butylsilyl)silylene, (tBu3Si)2Si: (2). The signal intensity as a function of temperature (9-80 K) gave a linear relation, and the spin multiplicity of 2 in the ground state was established to be a triplet. Product analysis, from which disilacyclobutane derivative 3 and dihydrosilane (tBu3Si)2SiH2 (4) were formed, also supports the conclusion about the multiplicity of 2.
authors.affiliation: Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan. sekiguch@staff.chem.tsukuba.ac.jp
authors.forename: Akira
authors.initials: A
authors.lastname: Sekiguchi
authors.forename: Takashi
authors.initials: T
authors.lastname: Tanaka
authors.forename: Masaaki
authors.initials: M
authors.lastname: Ichinohe
authors.forename: Kimio
authors.initials: K
authors.lastname: Akiyama
authors.forename: Shozo
authors.initials: S
authors.lastname: Tero-Kubota