摘要：

Crystals of hexadecamethylcyclooctasiloxane are tetragonal, =13.9442(5), =8.5573(4), =2, space group 4/. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to a final of 0.034 and =0.042 for 730 reflections with ≥3σ(). The molecular structure closely resembles that of [(CH)PN]. Its comparatively rigid conformation, in which the silicon atoms form a crown, is dependent on the efficient use of van der Waals interactions between two sets of four methyl groups. Important molecular dimensions (bond lengths corrected for libration) are: Si—O=1.629(1) and 1.635(1), Si—C=1.862(2) and 1.848(3), O—Si—O=108.99(6), Si—O—Si=157.8(1) and 148.8(2)°.

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