2,4,6,8-Tetramethyl-2,4,6,8-tetraphenyl-[1,3,5,7,2,4,6,8]cyclotetrasiloxane
- Formula: C28H32O4Si4
- Molecular weight: 544.8933
- IUPAC Standard InChI: InChI=1S/C28H32O4Si4/c1-33(25-17-9-5-10-18-25)29-34(2,26-19-11-6-12-20-26)31-36(4,28-23-15-8-16-24-28)32-35(3,30-33)27-21-13-7-14-22-27/h5-24H,1-4H3
- IUPAC Standard InChIKey: IRVZFACCNZRHSJ-UHFFFAOYSA-N
- CAS Registry Number: 77-63-4
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Tetramethyltetraphenylcyclotetrasiloxane; 2,4,6,8-tetramethyl-2,4,6,8-tetraphenylcyclotetrasiloxane; 1,1,5',7'-Tetramethyl-1',3',5,7-tetraphenylcyclotetrasiloxane
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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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Ttriple | 373.0 | K | N/A | Mekhtiev and Karasharli, 1981 | Uncertainty assigned by TRC = 0.1 K; TRC |
Enthalpy of fusion
| ΔfusH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 5.884 | 373.4 | AC | Domalski and Hearing, 1996 | AC |
IR Spectrum
Go To: Top, Phase change data, Gas Chromatography, References, Notes
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
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| Owner | COBLENTZ SOCIETY Collection (C) 2018 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
|---|---|
| Origin | DOW CORNING CORP. |
| Source reference | COBLENTZ NO. 5549 |
| Date | 1965/06/08 |
| Name(s) | 2,4,6,8-tetramethyl-2,4,6,8-tetraphenyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane |
| State | SOLUTION (10% IN CCl4 FOR 3800-1250, 2% IN CS2 FOR 1250-650, AND 10% IN CCl4 FOR 650-250 CM-1) PURE BY GLC |
| Instrument | PERKIN-ELMER 521 (GRATING) |
| Instrument parameters | FILTERS AT 3150, 2500, 2000, 1150, 700, 410. GRATING CHANGES: 2000, 630 CM-1 |
| Path length | 0.010 CM, 0.010 CM, AND 0.010 CM SPECTRAL CONTAMINATION DUE TO H2O VAPOR AROUND 3600-3700 CM-1 |
| Resolution | 2 |
| Sampling procedure | TRANSMISSION |
| Data processing | DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS) |
| Boiling point | 100 C |
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
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | Methyl Silicone | 2736. | Fujimoto, Ohtani, et al., 1990 | 25. m/0.25 mm/0.1 μm, He, 5. K/min; Tstart: 40. C; Tend: 350. C |
References
Go To: Top, Phase change data, IR Spectrum, Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Mekhtiev and Karasharli, 1981
Mekhtiev, S.A.; Karasharli, K.A.,
Analysis of the results of thermodynamic studies of a series of organosilicon compounds,
Azerb. Khim. Zhur., 1981, (5), 85-88. [all data]
Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D.,
Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III,
J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985
. [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
Go To: Top, Phase change data, IR Spectrum, Gas Chromatography, References
- Symbols used in this document:
Ttriple Triple point temperature ΔfusH Enthalpy of fusion - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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