Recently, we have reported the synthesis and properties of a poly (silylenee-thynylenepheny leneethynylene) ([[--[Si([CH.sub.3]).sub.2]--C[equivalent to]C--[C.sub.6][H.sub.4]--C[equivalent to]C--].sub.2] incorporated with o-carborane in the main chains by the in-situ reaction with decaborane ([B.sub.10][H.sub.14]) in the presence of acetonitrile (29), (30).
Decaborane ([B.sub.10][H.sub.14]) was prepared on the Ref.
After evacuated and backfilled with nitrogen for three times, the flask was charged with decaborane ([B.sub.10][H.sub.14], 0.20 g), poly(methylsilyleneethynylenephenyleneethynylene) (PHSEPE, 2.00 g), CH3CN (5 mL), and toluene (30 mL) under nitrogen purge.
The preparation of o-carborane and its derivatives can be carried out mainly through the reactions between acetylene compounds and decaborane ([B.sub.10][H.sub.14]) in the presence of Lewis base (L), or between acetylene compounds and [B.sub.10][H.sub.12]x2L complexes (26), (28).
Watson Research Center in Yorktown Heights, N.Y., and his co-workers have now demonstrated that electrons emitted from a microscope's tip can transfer sufficient energy to excite and shake apart a decaborane molecule sitting on a silicon surface.
Each decaborane molecule consists of 10 boron atoms and 14 hydrogen atoms.
Instead of heating up the entire crystal to produce borondoped silicon, Avouris and his team selectively excite individual decaborane molecules to dope only small, specific regions of the silicon surface.