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
• Silane, dimethylbis(trimethylsiloxy)-
• [(CH3)3SiO]2Si(CH3)2
• octamethyltrisiloxane

• 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).
• V_m : Molar Volume (m³/mol).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
IE	10.04	eV	NIST
logPoct/wat	3.391		Crippen Calculated Property
Pc	1360.27	kPa	Relay (1.0-beta) Calculated Property
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	567.47	K	Relay (1.0) Calculated Property
Vm	2.90e-04	m3/mol	Thermodynamic Study of Heptane + Silicone Mixtures. Excess Volumes and Enthalpies at 298.15 K

Cheméo can also estimate Normal melting (fusion) point, Critical Volume, Enthalpy of formation at standard conditions, Enthalpy of vaporization at standard conditions, Standard Gibbs free energy of formation, Acentric Factor, 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

• Cheméo Relay (1.0)
• Cheméo Relay (1.0, beta) Beta: served but experimental, data-limited and below our cross-validation release bar; the Joback value is recommended where available.
• 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.
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