Crystal and molecular structure of trisilylamine at 115 K

Abstract

At 115 K, crystals of trisilylamine are triclinic, space group P, with a= 6.84, b= 8.17, c= 6.87 Å, α= 95.5, β= 119.1, γ= 98.6°(0.3% estimated standard deviations are assumed), and Z= 2. Crystals were grown in situ on a Weissenberg goniometer fitted with low-temperature equipment. The structure has been refined to R= 0.051 using 651 photographic (microdensitometer) intensities. There are no short intermolecular contacts. Deviations from molecular C_3h symmetry are negligible, even for the hydrogen atoms. The mean length of the Si–N bonds is 1.730(5)Å. The heavy atoms vibrate mainly in a direction which is parallel to the molecular C₃ axis.