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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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
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| S°solid,1 bar | 249.5 | cal/mol*K | N/A | Kuliev, Dzhafarov, et al., 1982 |
Constant pressure heat capacity of solid
| Cp,solid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 222.9 | 298.15 | Kuliev, Dzhafarov, et al., 1982 | T = 12 to 300 K. |
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
| ΔfusH (kcal/mol) | Temperature (K) | Method | Reference |
|---|---|---|---|
| 0.301 | 473.2 | DSC | Matukhina, Shchegolikhina, et al., 2001 |
| 0.270 | 475. | N/A | Lebedev, Smirnova, et al., 2000 |
| 0.466 | 478.1 | N/A | Smith, 1979 |
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]
Notes
Go To: Top, Condensed phase thermochemistry data, Phase change data, References
- 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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