INCORPORATION OF BUTYL GROUPS INTO CHLORINATED DIAMOND SURFACE CARBONS BY ORGANIC-REACTIONS AT AMBIENT-TEMPERATURE

Hydrogenated diamond powder has been chlorinated by a radical reaction using sulfuryl chloride in chloroform at 50 degrees C. The chlorinate d diamond was then treated with n-, sec-and tert-butyllithium in tetra hydrofuran at 30 degrees C for 4 h. and butyl groups were incorporated onto the surface. The modified diamond powder was characterized by di ffuse reflectance IR Fourier-transformed (DRIFT) spectroscopy. The sur face substituents were decomposed by flash pyrolysis in a nitrogen flo w at temperatures between 255 and 1040 degrees C and essentially all o rganic fragments were recovered. When the pyrolysis temperature was in creased, the total amount of recovered carbons gradually approached a constant value. The fraction of butylated surface carbons to the total surface carbons was calculated based on pyrolysis products obtained a t 1040 degrees C and was 0.055 for n-butylation, 0.040 for sec-butylat ion and 0.047 for tert-butylation.