IR spectra of (MeO),SiMe on silica, in two states of hydroxylation immersed in heptane or carbon tetrachloride, and during desorption after removal of solvent, show that hydrogen bonding of (MeO),SiMe to two or three SiOH groups at low coverages is replaced by 1 : 1 silanol-silane interactions at high coverage. Adjacent surface silanol groups favour a bidentate interaction, in part involving pairs of silanol groups forming H bonds to single OMe groups. The adsorption of (Me0)3SiCH,CH,CH,NH, favours bi-or tridentate H bonding via OMe groups at
The use of sodium to dry carbon tetrachloride as described in the experimental section was an extremely unwise procedure as this mixture of chemicals can lead to violent explosions.' Under no circumstances should this method be adopted by others as alternative safe methods for drying carbon tetrachloride are available.'
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