Chemical Properties of Trisiloxane, octamethyl-

InChI

InChI=1S/C8H24O2Si3/c1-11(2,3)9-13(7,8)10-12(4,5)6/h1-8H3

InChI Key

CXQXSVUQTKDNFP-UHFFFAOYSA-N

Formula

C8H24O2Si3

SMILES

C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C

Molecular Weight¹

236.54

Other Names

• 1,1,1,3,3,5,5,5-Octamethyltrisiloxane
• CO9816
• Dimethylbis(trimethylsiloxy)silane
• O9816
• Octamethyltrisiloxan
• Silane, dimethylbis(trimethylsiloxy)-
• [(CH3)3SiO]2Si(CH3)2
• octamethyltrisiloxane

• ω : Acentric Factor.
• Δ_vapH : Enthalpy of vaporization at a given temperature (kJ/mol).
• IE : Ionization energy (eV).
• logP_oct/wat : Octanol/Water partition coefficient.
• P_c : Critical Pressure (kPa).
• I_np : Non-polar retention indices.
• c_sound,fluid : Speed of sound in fluid (m/s).
• T_boil : Normal Boiling Point Temperature (K).
• T_c : Critical Temperature (K).
• T_fus : Normal melting (fusion) point (K).
• V_c : Critical Volume (m³/kmol).
• V_m : Molar Volume (m³/mol).
• Z_c : Critical Compressibility.
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
ω	0.5310		PSRK revision IV (2005), critical constants and acentric factors of 1000 components Compiled value
IE	10.04	eV	NIST
logPoct/wat	3.391		Crippen Calculated Property
Pc	[1419.56; 1420.00]	kPa
Pc	1420.00	kPa	IUPAC Vapor-Liquid Critical Properties of Elements and Compounds, part 11 Compiled value
Pc	1419.56	kPa	PSRK revision IV (2005), critical constants and acentric factors of 1000 components Compiled value
Inp	[1031.00; 1038.00]
Inp	1031.00		NIST
Inp	1031.00		NIST
Inp	1034.00		NIST
Inp	1034.00		NIST
Inp	1038.00		NIST
Inp	1038.00		NIST
Tboil	427.10	K	Relay (1.0) Calculated Property
Tc	[562.90; 564.00]	K
Tc	564.00	K	IUPAC Vapor-Liquid Critical Properties of Elements and Compounds, part 11 Compiled value
Tc	562.90	K	PSRK revision IV (2005), critical constants and acentric factors of 1000 components Compiled value
Tfus	193.15	K	Jean-Claude Bradley Open Melting Point Dataset (2014, CC0) Compiled value
Vc	[0.876; 0.880]	m3/kmol
Vc	0.876	m3/kmol	IUPAC Vapor-Liquid Critical Properties of Elements and Compounds, part 11 Compiled value
Vc	0.880	m3/kmol	PSRK revision IV (2005), critical constants and acentric factors of 1000 components Compiled value
Vm	2.90e-04	m3/mol	Thermodynamic Study of Heptane + Silicone Mixtures. Excess Volumes and Enthalpies at 298.15 K
Zc	0.2650000		IUPAC Vapor-Liquid Critical Properties of Elements and Compounds, part 11 Compiled value

Cheméo can also estimate Enthalpy of formation at standard conditions, Enthalpy of vaporization at standard conditions, Standard Gibbs free energy of formation, Log10 of Water solubility in mol/l for this compound, but they fall outside the models' validated range, so they are not shown here. Open the prediction tool to compute them on demand.

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
ΔvapH	[40.20; 43.20]	kJ/mol	[381.00; 396.00]
ΔvapH	40.20	kJ/mol	381.00	NIST
ΔvapH	43.20	kJ/mol	396.00	NIST

Datasets

Speed of sound, m/s

Operational condition: Frequency, MHz = 8 (Liquid)

Fixed		Measured
Temperature, K - Liquid	Pressure, kPa - Liquid	Speed of sound, m/s - Liquid
299.62	101.00	911.32
299.63	502.00	914.41
299.64	984.00	918.29
299.64	1480.00	922.14
299.65	2012.00	926.38
299.66	3441.00	937.36
299.69	5923.00	955.8
299.61	10196.00	986.47
299.68	20155.00	1050.26
299.71	30179.00	1107.31
349.91	111.00	742.97
349.69	558.00	748.58
349.65	1075.00	754.2
349.60	1556.00	759.34
349.59	2066.00	764.64
349.58	3704.00	781.0
349.61	6067.00	803.25
349.59	10127.00	839.26
349.61	20075.00	915.62
349.64	29800.00	980.01
399.96	508.00	588.68
399.96	993.00	595.83
399.96	1439.00	602.33
399.95	2018.00	610.77
399.96	3510.00	630.8
400.02	9928.00	704.99
400.15	19875.00	796.17
399.42	29701.00	873.39
449.99	492.00	436.7
449.96	1045.00	448.89
449.98	1523.00	458.69
450.01	1994.00	468.09
450.05	3497.00	495.73
450.09	6009.00	536.6
450.14	9983.00	591.45
450.22	20246.00	701.94
449.44	23518.00	734.5
499.04	1000.00	292.6
499.02	1521.00	313.47
498.96	1989.00	328.83
498.94	3487.00	373.05
499.00	5834.00	424.21
499.02	10178.00	498.23
499.05	16859.00	585.07
549.79	4484.00	279.71
549.74	6653.00	340.31
549.80	10050.00	411.61
549.84	12528.00	452.26
549.67	15312.00	492.6
Reference

Similar Compounds

Find more compounds similar to Trisiloxane, octamethyl-.

Mixtures

• Trisiloxane, octamethyl- + Heptane
• Disiloxane, hexamethyl- + Trisiloxane, octamethyl-

Sources

• Jean-Claude Bradley Open Melting Point Dataset (2014, CC0) ChEDL chemicals 1.5.2, from Bradley, J.-C.; Williams, A.; Lang, A. Jean-Claude Bradley Open Melting Point Dataset. Figshare, 2014 (CC0).
• IUPAC Vapor-Liquid Critical Properties of Elements and Compounds, part 11 ChEDL chemicals 1.5.2, from Ambrose, D.; Tsonopoulos, C.; Nikitin, E. D. Vapor-Liquid Critical Properties of Elements and Compounds. 11. Organic Compounds Containing B + O; Halogens + N, + O, + O + S, + S, + Si; N + O; and O + S, + Si. J. Chem. Eng. Data 2009, 54, 669-689.
• PSRK revision IV (2005), critical constants and acentric factors of 1000 components ChEDL chemicals 1.5.2, from Horstmann, S.; Jabłoniec, A.; Krafczyk, J.; Fischer, K.; Gmehling, J. PSRK Group Contribution Equation of State: Comprehensive Revision and Extension IV, Including Critical Constants and α-Function Parameters for 1000 Components. Fluid Phase Equilib. 2005, 227, 157-164.
• Cheméo Relay (1.0)
• Crippen Method
• Crippen Method
• Speed of Sound Measurements and Fundamental Equations of State for Octamethyltrisiloxane and Decamethyltetrasiloxane
• Bubble-Point Measurements and Modeling of Binary Mixtures of Linear Siloxanes
• Thermodynamic Study of Heptane + Silicone Mixtures. Excess Volumes and Enthalpies at 298.15 K
• Octanol/Air Partition Coefficients of Volatile Methylsiloxanes and Their Temperature Dependence
• NIST Webbook

Note: Cheméo is only indexing the data, follow the source links to retrieve the latest data. The source is also providing more information like the publication year, authors and more. Take the time to validate and double check the source of the data.
Calculated This icon marks a calculated value or equation: a prediction, not a measurement.
Compiled This icon marks a compiled value or equation: taken from a data compilation such as ChemSep, not from an original measurement report.
These property values are available through the Cheméo API. A free account gives you an access key.