Octaphenylcyclotetrasiloxane

• Formula: C₄₈H₄₀O₄Si₄
• Molecular weight: 793.1708
• IUPAC Standard InChI: InChI=1S/C48H40O4Si4/c1-9-25-41(26-10-1)53(42-27-11-2-12-28-42)49-54(43-29-13-3-14-30-43,44-31-15-4-16-32-44)51-56(47-37-21-7-22-38-47,48-39-23-8-24-40-48)52-55(50-53,45-33-17-5-18-34-45)46-35-19-6-20-36-46/h1-40H Copy

  
• IUPAC Standard InChIKey: VSIKJPJINIDELZ-UHFFFAOYSA-N Copy
• CAS Registry Number: 546-56-5
• Chemical structure:
  This structure is also available as a 2d Mol file
• Other names: Cyclotetrasiloxane, octaphenyl-; Octaphenyltetracyclosiloxane; 1,1,3,3,5,5,7,7-Octaphenylcyclotetrasiloxane; CO9817; 2,4,6,8-tetradiphenyl-[1,3,5,7,2,4,6,8]cyclotetrasiloxane
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• Information on this page:
  • Condensed phase thermochemistry data
  • Phase change data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Gas Chromatography
  • References
  • Notes
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Condensed phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing

Constant pressure heat capacity of solid

Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: William E. Acree, Jr., James S. Chickos

Enthalpy of fusion

IR Spectrum

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Coblentz Society, Inc.

Condensed Phase Spectrum

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Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here.

Notice: Concentration information is not available for this spectrum and, therefore, molar absorptivity values cannot be derived.

Additional Data

Mass spectrum (electron ionization)

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

Gas Chromatography

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Normal alkane RI, non-polar column, temperature ramp

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References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Kuliev, Dzhafarov, et al., 1982
Kuliev, A.M.; Dzhafarov, O.I.; Karasharli, K.A.; Kostryukov, V.N., Heat capacity and thermodynamic functions of 1,1,3,3,5,5-hexaphenyl-7, 7-dimethylcyclotetrasiloxane and octaphenylcyclotetrasiloxane, 1982, Azerb. [all data]

Matukhina, Shchegolikhina, et al., 2001
Matukhina, Elena V.; Shchegolikhina, Olga I.; Makarova, Natalia N.; Pozdniakova, Yulia A.; Katsoulis, Dimitris E.; Godovsky, Yuli K., New mesomorphic organocyclosiloxanes I. Thermal behaviour and mesophase structure of organocyclotetrasiloxanes, Liquid Crystals, 2001, 28, 6, 869-879, https://doi.org/10.1080/02678290110039930 . [all data]

Lebedev, Smirnova, et al., 2000
Lebedev, B.V.; Smirnova, N.N.; Papkov, V.S.; Buzin, M.I.; Dubovik, I.I., Thermodynamics of poly(diphenylsiloxane) in the temperature region of 0-620 K, Poly. Sci., Ser. A, 2000, 42, 10, 1111. [all data]

Smith, 1979
Smith, George W., Phase behavior and nucleation kinetics of Octaphenylcyclotetrasiloxane, Phase Transitions, 1979, 1, 2, 107-129, https://doi.org/10.1080/01411597908213195 . [all data]

Fujimoto, Ohtani, et al., 1990
Fujimoto, S.; Ohtani, H.; Yamagiwa, K.; Tsuge, S., Study on retention behavior of cyclic siloxanes by high resolution pyrolysis-gas chromatography with a fused silica capillary column, J. Hi. Res. Chromatogr., 1990, 13, 6, 397-404, https://doi.org/10.1002/jhrc.1240130603 . [all data]

Notes

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• Symbols used in this document:
  

  Cp,solid	Constant pressure heat capacity of solid
  S°solid,1 bar	Entropy of solid at standard conditions (1 bar)
  ΔfusH	Enthalpy of fusion

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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