Alkoxy(tetraaryl)silicates bearing 9,10-disilatriptycene skeleton

Shintaro Ishida, Minori Takiguchi, Takeaki Iwamoto

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


As anionic five-coordinate silicon species (five-coordinate silicates) exhibit high reactivity and unique fluxional behavior, their structure and property have received substantial attention. We report herein synthesis, structure, and fluxional behavior of alkoxy(tetraaryl)silicates having the 9,10-disilatriptycene skeleton (6 and 7). The molecular structure of the cryptate salt [Li(crypt-222)]+7 shows that the five-coordinate silicon adopts a distorted trigonal bipyramidal structure with oxygen atom occupying an equatorial position. In the 1H and 13C{1H} NMR spectra of [Li(crypt-222)]+7, a set of signals due to o-phenylene blades in 7 was observed at room temperature, which indicates fluxional behavior of 7 on the NMR timescale. Computational study suggests that the observed process proceeds via a 120° rotation of bidentate ligand around the Si-Si axis that consists of two sequential Berry pseudorotations.

Original languageEnglish
Article numbere21481
JournalHeteroatom Chemistry
Issue number5-6
Publication statusPublished - 2018 Dec


  • dynamic behavior
  • pseudorotation
  • silicate

ASJC Scopus subject areas

  • Chemistry(all)


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