Dioxosilane
- Formula: O2Si
- Molecular weight: 60.0843
- IUPAC Standard InChI: InChI=1S/O2Si/c1-3-2
- IUPAC Standard InChIKey: VYPSYNLAJGMNEJ-UHFFFAOYSA-N
- CAS Registry Number: 7631-86-9
- 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. - Species with the same structure:
- Other names: Amorphous silica; Hydrolyzed silica (cab-o-sil); Crystalline silica; Silicon dioxide; Silica; Silicon(iv) oxide
- Information on this page:
- Other data available:
- Data at other public NIST sites:
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Gas 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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -305.43 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1967 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 228.98 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1967 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 4500. to 6000. |
|---|---|
| A | 61.55710 |
| B | 0.446596 |
| C | -0.090267 |
| D | 0.006247 |
| E | -3.664591 |
| F | -333.4418 |
| G | 289.4972 |
| H | -305.4324 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1967 |
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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -902.66 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1967 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 47.92 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1967 |
Liquid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 1996. to 4500. |
|---|---|
| A | 85.77200 |
| B | -0.000016 |
| C | 0.000004 |
| D | -3.809081×10-7 |
| E | -0.000017 |
| F | -952.8700 |
| G | 113.3440 |
| H | -902.6610 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1967 |
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.
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
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| Temperature (K) | A | B | C | Reference | Comment |
|---|---|---|---|---|---|
| 2005. to 2500. | 7.82064 | 20008.568 | 58.883 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
IR Spectrum
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Data compiled by: Coblentz Society, Inc.
- Not specified, most likely a prism, grating, or hybrid spectrometer.; (NO SPECTRUM, ONLY SCANNED IMAGE IS AVAILABLE)
- SOLID (0.5 mg / 300 mg CsI DISC); BECKMAN IR-12 (GRATING); DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS)
4, 4 cm-1 resolution - SOLID (0.5 mg / 300 mg CsI PELLET); Not specified, most likely a grating spectrometer.; DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 4 cm-1 resolution
- SOLID (MULL) $$ SEE 4662 FOR KBr DISC; PERKIN-ELMER 521 (GRATING); 2 cm-1 resolution
Vibrational and/or electronic energy levels
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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: Marilyn E. Jacox
State: X
| Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
|---|---|---|---|---|---|---|---|
| Πu | 2 | Bend | 272.5 | Ar | IR | Andrews and McCluskey, 1992 | |
| Σu+ | 3 | Asym. stretch | 1416.4 | Ar | IR | Schnockel, 1978 Schnockel, 1980 Andrews and McCluskey, 1992 | |
Additional references: Jacox, 1994, page 86
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Vibrational and/or electronic energy levels, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
Andrews and McCluskey, 1992
Andrews, L.; McCluskey, M.,
Bending modes of SiO2 and GeO2 in solid argon,
J. Mol. Spectrosc., 1992, 154, 1, 223, https://doi.org/10.1016/0022-2852(92)90042-M
. [all data]
Schnockel, 1978
Schnockel, H.,
IR-spektroskopischer Nachweis von molekularem SiO2,
Angew. Chem., 1978, 90, 8, 638, https://doi.org/10.1002/ange.19780900821
. [all data]
Schnockel, 1980
Schnockel, H.,
Matrixreaktionen von SiO. IR-spektroskopischer Nachweis der Molekeln SiO2 und OSiCl2,
Z. Anorg. Allg. Chem., 1980, 460, 1, 37, https://doi.org/10.1002/zaac.19804600104
. [all data]
Jacox, 1994
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Vibrational and/or electronic energy levels, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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