Jump to main content
Jump to site search

Issue 2, 1984
Previous Article Next Article

The 2*–3 interaction in aromatic silanes. Fluorescence from the 1(2, 3) intramolecular charge-transfer state

Abstract

The 2*–3 interaction in the excited state of aromatic silanes has been studied by means of absorption and emission spectroscopy. Broad and structureless fluorescence spectra of phenyldisilanes and naphthyldisilanes with large Stokes shifts have been observed and they have been attributed to the emissions from the intramolecular charge-transfer (c.t.) states with large dipole moments. Evidence that the c.t. emission originates from the 1(2, 3) state produced by the 2*(aromatic ring)→ 3(Si—Si bond) intramolecular charge transfer is given by the effect of steric twisting on the emission. It is shown that the fast formation (⩽ 1 ns) of the c.t. state from the locally excited state 1(π, π*)1B2(or 1Lb) of phenyldisilanes takes place, followed by rapid decay (⩽ 1 ns) of the intersystem crossing 1(2, 3)→3(π, π*). However, no c.t. emission has been observed for aromatic monosilanes and polycyclic aromatic disilanes (aromatic rings [gt-or-equal] 3) even in fluid polar solvents. The 2*→3 intramolecular c.t. mechanism is discussed in comparison with that of the twisted intramolecular charge-transfer (t.i.c.t.) state.

Back to tab navigation

Article type: Paper
DOI: 10.1039/F19848000341
Citation: J. Chem. Soc., Faraday Trans. 1, 1984,80, 341-357
  •   Request permissions

    The 2*–3 interaction in aromatic silanes. Fluorescence from the 1(2, 3) intramolecular charge-transfer state

    H. Shizuka, Y. Sato, Y. Ueki, M. Ishikawa and M. Kumada, J. Chem. Soc., Faraday Trans. 1, 1984, 80, 341
    DOI: 10.1039/F19848000341

Search articles by author

Spotlight

Advertisements