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
IUPAC Standard InChIKey: VSIKJPJINIDELZ-UHFFFAOYSA-N
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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Phase change data

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

Enthalpy of fusion

Δ_fusH (kJ/mol)	Temperature (K)	Method	Reference
1.26	473.2	DSC	Matukhina, Shchegolikhina, et al., 2001
1.13	475.	N/A	Lebedev, Smirnova, et al., 2000
1.95	478.1	N/A	Smith, 1979

Gas Chromatography

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

Normal alkane RI, non-polar column, temperature ramp

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Column type	Active phase	I	Reference	Comment
Capillary	Methyl Silicone	4483.	Fujimoto, Ohtani, et al., 1990	25. m/0.25 mm/0.1 μm, He, 5. K/min; T_start: 40. C; T_end: 350. C

References

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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:

Δ_fusH Enthalpy of fusion
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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