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Polymorphism of molecules and complex ions in oxygen compounds of silicon and phosphorus Communication 5. Phase transitions and structure of molecules of cyclic dimethylpolysiloxanes

  • Physical Chemistry
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Bulletin of the Academy of Sciences of the USSR, Division of chemical science Aims and scope

Conclusions

  1. 1.

    A spectroscopic investigation of cyclic dimethylpolysiloxanes indicates great deformability of the rings, all the way up to a change in the conformation, at changes from −100° and above.

  2. 2.

    Transition from the crystalline phase to the liquid phase, in the case of rings with an even number of siloxane “bridges” Si-O-Si, leads to a change in the conformation of the closed chain from a configuration with “identity period” of two units (trans-) to a configuration in which the “identity period” is formed by one unit (cis-).

  3. 3.

    Dimethylpolysiloxanes with an odd number of siloxane units in the ring possess the same conformation in the liquid and crystal, analogous to the conformation of the rings with an odd number of units, characteristic of the liquid phase.

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Authors and Affiliations

  1. I. V. Grebenshchikov Institute of Silicate Chemistry, Academy of Sciences of the USSR, USSR

    A. N. Lazarev & T. F. Tenisheva

Authors
  1. A. N. Lazarev
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  2. T. F. Tenisheva
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 983–990, June, 1966.

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Lazarev, A.N., Tenisheva, T.F. Polymorphism of molecules and complex ions in oxygen compounds of silicon and phosphorus Communication 5. Phase transitions and structure of molecules of cyclic dimethylpolysiloxanes. Russ Chem Bull 15, 940–946 (1966). https://doi.org/10.1007/BF00846044

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  • DOI: https://doi.org/10.1007/BF00846044

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