Additions and corrections

Structural study of the cyclic chlorosiloxanes and chlorosilathianes

Robert G. A. R. Maclagan, Mark Nieuwenhuyzen, Cuthbert J. Wilkins and Bryce E. Williamson

J. Chem. Soc., Dalton Trans., 1998, 2697

The authors regret that in the above paper we omitted to refer to the paper of Wannagat et al.¹ This study compared the isoelectronic Si/O and P/N cyclic polymers, and included an X-ray analysis of the (SiOCl₂)₃ and (SiOCl₂)₄ molecules and a normal coordinate analysis of the vibrational specta. No quantum chemical calculations were performed in the Wannagat et al. study. In our study, the crystals used for the X-ray structure determination were the crystals whose preparation was described in the 1960 paper from this laboratory.² These had been stored in sealed containers for 35 years. The crystals had grown in size presumably from very slow sublimation and with the possibility of reduced mosaicity. The crystal structure parameters for the trimer, as measured in the two laboratories, are almost identical. However the crystal structure of the older tetramer crystals showed the (SiOCl₂)₄ molecule to have adopted a chair, rather than the planar conformation found by Wannagat et al., and in the quantum chemical calculations, and also had lower anisotropic displacement parameters.

References

1 U. Wannagat, G. Bogedain, A. Schervan, H. C. Marsmann, D. J. Brauer, H. Burger, F. Dorrenbach, G. Pawelke, C. Kruger and K.-H. Claus, Z. Naturforsch., Teil B, 1990, 46, 931.

2 D. W. S. Chambers and C. J. Wilkins, J. Chem. Soc., 1960, 5088.

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