Cycloheptasiloxane, tetradecamethyl-
- Formula: C14H42O7Si7
- Molecular weight: 519.0776
- IUPAC Standard InChI: InChI=1S/C14H42O7Si7/c1-22(2)15-23(3,4)17-25(7,8)19-27(11,12)21-28(13,14)20-26(9,10)18-24(5,6)16-22/h1-14H3
- IUPAC Standard InChIKey: GSANOGQCVHBHIF-UHFFFAOYSA-N
- CAS Registry Number: 107-50-6
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Tetradecamethylcycloheptasiloxane
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Phase change data
Go To: Top, IR Spectrum, Mass spectrum (electron ionization), 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 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 |
|---|---|---|---|---|---|
| Tfus | 238. | K | N/A | Alvik and Dale, 1971 | Uncertainty assigned by TRC = 0.1 K; TRC |
Enthalpy of vaporization
| ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 14.0 | 374. | A | Stephenson and Malanowski, 1987 | Based on data from 359. to 537. K.; AC |
| 14.5 | 446. | EB | Flaningam, 1986 | Based on data from 431. to 548. K.; AC |
Enthalpy of fusion
| ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 4.990 | 237.7 | Alvik, Dale, et al., 1971 | AC |
IR Spectrum
Go To: Top, Phase change data, Mass spectrum (electron ionization), 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 | Copyright (C) 1987 by the 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. 5594 |
| Date | 1965/02/04 |
| Name(s) | 2,2,4,4,6,6,8,8,10,10,12,12,14,14-tetradecamethylcycloheptasiloxane |
| State | SOLUTION (5% CCl4 FOR 3800-1300, 2% CS2 FOR 1300-620, AND 5% CCl4 FOR 620-210) |
| Instrument | PERKIN-ELMER 521 (GRATING) |
| Instrument parameters | FILTERS AT 3150, 2500, 2000, 1150, 700, 410. GRATING CHANGES: 2000, 630 |
| Path length | 0.011 CM, 0.011 CM, AND 0.020 CM SPECTRAL FEATURE AT 1303 CM-1 IS AN ARTIFACT CAUSED BY A CHANGE IN SOLVENT |
| Resolution | 2 |
| Boiling point | 154 C AT 20 mmHg |
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
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Due to licensing restrictions, this spectrum cannot be downloaded.
| Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
|---|---|
| Origin | Chemical Concepts |
| NIST MS number | 153820 |
Gas Chromatography
Go To: Top, Phase change data, IR Spectrum, Mass spectrum (electron ionization), 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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Van Den Dool and Kratz RI, non-polar column, temperature ramp
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | Ultra-1 | 1519. | Richmond and Pombo-Villar, 1998 | 25. m/0.32 mm/0.52 μm, He, 15. K/min, 320. C @ 10. min; Tstart: 35. C |
Normal alkane RI, non-polar column, temperature ramp
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | SP-2100 | 1516. | Fischer and Kusch, 1993 | He, 40. C @ 3. min, 5. K/min; Column length: 30. m; Column diameter: 0.25 mm; Tend: 280. C |
| Capillary | Methyl Silicone | 1538. | Fujimoto, Ohtani, et al., 1990 | 25. m/0.25 mm/0.1 μm, He, 5. K/min; Tstart: 40. C; Tend: 350. C |
Normal alkane RI, non-polar column, custom temperature program
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | Ultra-1 | 1526. | Kazuyoshi, Seiichi, et al., 2000 | 30. m/0.25 mm/0.50 μm; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min) |
| Capillary | Ultra-1 | 1526. | Kazuyoshi, Seiichi, et al., 2000 | 30. m/0.25 mm/0.50 μm; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min) |
| Capillary | Ultra-1 | 1527. | Kazuyoshi, Seiichi, et al., 2000 | 30. m/0.25 mm/0.50 μm; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min) |
| Capillary | Ultra-1 | 1531. | Kazuyoshi, Seiichi, et al., 2000 | 30. m/0.25 mm/0.50 μm; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min) |
| Capillary | Ultra-1 | 1537. | Kazuyoshi, Seiichi, et al., 2000 | 30. m/0.25 mm/0.50 μm; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min) |
| Capillary | Ultra-1 | 1538. | Kazuyoshi, Seiichi, et al., 2000 | 30. m/0.25 mm/0.50 μm; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min) |
| Capillary | Ultra-1 | 1518. | Richmond and Pombo-Villar, 1998 | 25. m/0.32 mm/0.52 μm, He; Program: not specified |
References
Go To: Top, Phase change data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Alvik and Dale, 1971
Alvik, T.; Dale, J.,
On the Lack of Conformational Preferences for Cyclic Dimethylsiloxane Oligomers.,
Acta Chem. Scand., 1971, 25, 2131, https://doi.org/10.3891/acta.chem.scand.25-2131
. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
Flaningam, 1986
Flaningam, Ora L.,
Vapor pressures of poly(dimethylsiloxane) oligomers,
J. Chem. Eng. Data, 1986, 31, 3, 266-272, https://doi.org/10.1021/je00045a002
. [all data]
Alvik, Dale, et al., 1971
Alvik, Thor; Dale, Johannes; Fernholt, L.; Hedberg, Kenneth; Schaumburg, Kjeld; Ehrenberg, L.,
On the Lack of Conformational Preferences for Cyclic Dimethylsiloxane Oligomers.,
Acta Chem. Scand., 1971, 25, 2131-2141, https://doi.org/10.3891/acta.chem.scand.25-2131
. [all data]
Richmond and Pombo-Villar, 1998
Richmond, R.; Pombo-Villar, E.,
Short communication. Use of persistent trace gas chromatography artifacts for the calculation of pseudo-Sadtler retention indices,
J. Chromatogr. A, 1998, 811, 1-2, 241-245, https://doi.org/10.1016/S0021-9673(98)00285-4
. [all data]
Fischer and Kusch, 1993
Fischer, G.W.; Kusch, P.,
An Automated Curie-Point Pyrolysis-High Resolution Gas Chromatography System,
LC-GC Int., 1993, 6, 12, 760-763. [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]
Kazuyoshi, Seiichi, et al., 2000
Kazuyoshi, N.; Seiichi, Y.; Kazuo, K.; Katsumi, I.; Okihiko, S.,
Polymer analysis by improved pyrolysis gas chromatography hyphenated with four specific detectors,
J. Soc. Cosmet. Chem. Jpn., 2000, 34, 2, 142-151, https://doi.org/10.5107/sccj.34.142
. [all data]
Notes
Go To: Top, Phase change data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, References
- Symbols used in this document:
Tfus Fusion (melting) point ΔfusH Enthalpy of fusion ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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