Chemical Properties of Cyclotrisiloxane, hexamethyl- (CAS 541-05-9)

InChI

InChI=1S/C6H18O3Si3/c1-10(2)7-11(3,4)9-12(5,6)8-10/h1-6H3

InChI Key

HTDJPCNNEPUOOQ-UHFFFAOYSA-N

Formula

C6H18O3Si3

SMILES

C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O1

Molecular Weight¹

222.46

CAS

541-05-9

Other Names

• CH7260
• D3 (hexamethylcyclotrisiloxane)
• Dimethylsiloxane cyclic trimer
• hexamethylcyclotrisiloxane

• C_p,liquid : Liquid phase heat capacity (J/mol×K).
• C_p,solid : Solid phase heat capacity (J/mol×K).
• Δ_fusH : Enthalpy of fusion at a given temperature (kJ/mol).
• Δ_subH : Enthalpy of sublimation at a given temperature (kJ/mol).
• Δ_vapH° : Enthalpy of vaporization at standard conditions (kJ/mol).
• Δ_vapH : Enthalpy of vaporization at a given temperature (kJ/mol).
• logP_oct/wat : Octanol/Water partition coefficient.
• P_c : Critical Pressure (kPa).
• P_vap : Vapor pressure (kPa).
• I_np : Non-polar retention indices.
• S°_{solid,1 bar} : Solid phase molar entropy at standard conditions (J/mol×K).
• T_boil : Normal Boiling Point Temperature (K).
• T_c : Critical Temperature (K).
• T_fus : Normal melting (fusion) point (K).
• T_triple : Triple Point Temperature (K).
• V_c : Critical Volume (m³/kmol).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
ΔvapH°	51.88	kJ/mol	Relay (1.0) Calculated Property
logPoct/wat	2.155		Crippen Calculated Property
Pc	1911.15	kPa	Relay (1.0-beta) Calculated Property
Inp	[825.00; 833.00]
Inp	827.00		NIST
Inp	833.00		NIST
Inp	825.00		NIST
Inp	828.00		NIST
Inp	829.00		NIST
Inp	830.00		NIST
Inp	831.00		NIST
Inp	831.00		NIST
Inp	827.00		NIST
S°solid,1 bar	412.10	J/mol×K	NIST
Tboil	407.00	K	NIST
Tc	549.01	K	Relay (1.0) Calculated Property
Tfus	[337.00; 339.50]	K
Tfus	337.00 ± 0.10	K	NIST
Tfus	339.50 ± 0.10	K	NIST
Ttriple	[335.22; 335.22]	K
Ttriple	335.22 ± 0.02	K	NIST
Ttriple	335.22 ± 0.02	K	NIST
Vc	0.747	m3/kmol	Relay (1.0) Calculated Property

Cheméo can also estimate Enthalpy of formation at standard conditions, Standard Gibbs free energy of formation, Acentric Factor, Ionization energy, 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
Cp,liquid	[404.50; 433.20]	J/mol×K	[339.90; 404.89]
Cp,liquid	404.50	J/mol×K	339.90	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	405.90	J/mol×K	343.15	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	406.70	J/mol×K	345.03	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	410.40	J/mol×K	353.15	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	412.30	J/mol×K	357.92	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	413.80	J/mol×K	361.20	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	415.60	J/mol×K	365.09	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	418.10	J/mol×K	370.16	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	420.10	J/mol×K	374.79	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	421.80	J/mol×K	379.42	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	423.60	J/mol×K	383.15	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	425.60	J/mol×K	388.06	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	428.10	J/mol×K	393.14	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	430.00	J/mol×K	398.01	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	431.00	J/mol×K	400.00	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,liquid	433.20	J/mol×K	404.89	Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
Cp,solid	360.00	J/mol×K	298.15	NIST
ΔfusH	16.61	kJ/mol	335.20	NIST
ΔsubH	55.20 ± 0.40	kJ/mol	316.00	NIST
ΔvapH	[39.00; 40.80]	kJ/mol	[365.50; 380.50]
ΔvapH	39.70	kJ/mol	365.50	NIST
ΔvapH	39.00	kJ/mol	373.00	NIST
ΔvapH	39.70	kJ/mol	378.00	NIST
ΔvapH	40.80	kJ/mol	380.50	NIST

Correlations

Property	Value	Unit	Temperature (K)	Source
Pvap	[1.33; 202.62]	kPa	[300.99; 435.51]	The Yaws Handbook of Vapor Pressure
Equation			ln(Pvp) = A + B/(T + C)
Coefficient A			1.38637e+01
Coefficient B			-3.10902e+03
Coefficient C			-7.19820e+01
Temperature range, min.			300.99
Temperature range, max.			435.51
Pvap	1.33	kPa	300.99	Calculated Property
Pvap	3.06	kPa	315.94	Calculated Property
Pvap	6.39	kPa	330.88	Calculated Property
Pvap	12.31	kPa	345.83	Calculated Property
Pvap	22.16	kPa	360.78	Calculated Property
Pvap	37.64	kPa	375.72	Calculated Property
Pvap	60.83	kPa	390.67	Calculated Property
Pvap	94.17	kPa	405.62	Calculated Property
Pvap	140.42	kPa	420.56	Calculated Property
Pvap	202.62	kPa	435.51	Calculated Property

Similar Compounds

Find more compounds similar to Cyclotrisiloxane, hexamethyl-.

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
• Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane
• NIST Webbook
• The Yaws Handbook of Vapor Pressure

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