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Synthesis, structures, and unusual photoluminescence of O- and N-functional cyclohexasilanes

Organometallics, ISSN: 0276-7333, Vol: 24, Issue: 26, Page: 6374-6381
2005
  • 20
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  • 14
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  • Citations
    20
    • Citation Indexes
      20
  • Captures
    14

Article Description

The reaction of chloropermethylcyclohexasilanes SiMe Cl (n = 1-3) with lithium silanolates affords the siloxy derivatives SiMe(OR) (n = 1-3; R = SiMe, SiMe-t-Bu). All compounds exhibit bathochromically shifted first UV absorption maxima and room-temperature photoluminescence in solution with emission maxima near 340 nm and remarkably enhanced luminescence intensity as compared to the data for Si Me. The solution photoemission spectra of the corresponding aminocyclohexasilanes SiMe(NR ) (n = 1, 2; R = -SiMe), which are accessible from SiMeCl and LiN(SiMe), do not show any luminescence above 300 nm. Crystal structure analyses of the 1,3- and 1,4-disubstituted derivatives exhibit the cyclohexasilane ring in the chair conformation with the -OR or -NR groups in either axial or equatorial positions, depending on the steric bulk of the hetero substituents. © 2005 American Chemical Society.

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