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Polymorphism of molecules and complex ions in oxygen compounds of silicon and phosphorus. Communication 4. Phase transitions and conformations of the octamethylcyclotetrasiloxane molecule [OSi(CH3)2]4

Conclusions

  1. 1.

    The phase transition in crystalline octamethylcyclotetrasiloxane is due to transition of the molecules from Ci to S4 symmetry. During melting, a further change in the structure of the molecule occurs; in the liquid phase it apparently possesses C4 symmetry, which is also preserved in the gas phase.

  2. 2.

    The transformations of the molecule [OSi(CH3)2]4 consist of a change in the conformation of ring and do not lead to any significant change in the bond lengths and valence angles in the ring. A vital role in the mechanism of the molecular rearrangement is played by the lability of the SiOSi angle-thermal excitation of the nonplanar deformational vibrations of the siloxane ring.

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Literature cited

  1. 1.

    A. N. Lazarev, Izv. AN SSSR. Ser. Khim.,1964, 235.

  2. 2.

    A. N. Lazarev and T. F. Tenisheva, Izv. AN SSSR. Ser. Khim.,1964, 242.

  3. 3.

    A. N. Lazarev and T. F. Tenisheva, Izv. AN SSSR. Ser. Khim.,1964, 403.

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    W. R. Thorson and I. Nadagawa, J. Chem. Phys.33, 994 (1960).

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Author information

Additional information

The authors would like to express their profound gratitude to V. N. Nikitin and L. I. Maklakov, for providing the possibility of using the DFS-12 instrument and a cryostatic cuvette for the Raman spectra, to D. S. Nedzvetskii, who aided in obtaining the spectra on the ISP-67 instrument, and to V. P. Davydova, who provided the octamethylcyclotetrasiloxane.

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1168–1177, July, 1964

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Lazarev, A.N., Tenisheva, T.F. Polymorphism of molecules and complex ions in oxygen compounds of silicon and phosphorus. Communication 4. Phase transitions and conformations of the octamethylcyclotetrasiloxane molecule [OSi(CH3)2]4 . Russ Chem Bull 13, 1086–1094 (1964). https://doi.org/10.1007/BF00863106

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Keywords

  • Oxygen
  • Silicon
  • Phosphorus
  • Phase Transition
  • Liquid Phase