Chemical Properties of 2,2,4,4,6,6-Hexamethyl-8,8-diphenyl-[1,3,5,7,2,4,6,8]cyclotetrasiloxane (CAS 1693-44-3)

InChI

InChI=1S/C18H28O4Si4/c1-23(2)19-24(3,4)21-26(22-25(5,6)20-23,17-13-9-7-10-14-17)18-15-11-8-12-16-18/h7-16H,1-6H3

InChI Key

BOIFXPDTOHPTOD-UHFFFAOYSA-N

Formula

C18H28O4Si4

SMILES

C[Si]1(C)O[Si](C)(C)O[Si](c2ccccc2)(c2ccccc2)O[Si](C)(C)O1

Molecular Weight¹

420.75

CAS

1693-44-3

Other Names

• 2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane
• 1,1,3,3,5,5-Hexamethyl-7,7-diphenylcyclotetrasiloxane

• ω : Acentric Factor.
• C_p,solid : Solid phase heat capacity (J/mol×K).
• Δ_fG° : Standard Gibbs free energy of formation (kJ/mol).
• Δ_fH°_gas : Enthalpy of formation at standard conditions (kJ/mol).
• Δ_fusH : Enthalpy of fusion at a given temperature (kJ/mol).
• Δ_vapH° : Enthalpy of vaporization at standard conditions (kJ/mol).
• IE : Ionization energy (eV).
• log₁₀WS : Log10 of Water solubility in mol/l.
• logP_oct/wat : Octanol/Water partition coefficient.
• P_c : Critical Pressure (kPa).
• I_np : Non-polar retention indices.
• Δ_fusS : Entropy of fusion at a given temperature (J/mol×K).
• 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
ω	0.5667		Relay (1.0) Calculated Property
ΔfG°	-111.75	kJ/mol	Relay (1.0-beta) Calculated Property
ΔfH°gas	-922.14	kJ/mol	Relay (1.0) Calculated Property
ΔvapH°	86.07	kJ/mol	Relay (1.0) Calculated Property
IE	8.92	eV	Relay (1.0) Calculated Property
log10WS	-3.73		Relay (1.0) Calculated Property
logPoct/wat	3.428		Crippen Calculated Property
Pc	762.12	kPa	Relay (1.0-beta) Calculated Property
Inp	1883.00		NIST
S°solid,1 bar	[758.60; 758.60]	J/mol×K
S°solid,1 bar	758.60	J/mol×K	NIST
S°solid,1 bar	758.60	J/mol×K	NIST
Tboil	588.87	K	Relay (1.0) Calculated Property
Tc	830.19	K	Relay (1.0) Calculated Property
Tfus	318.16	K	Relay (1.0) Calculated Property
Ttriple	304.96 ± 0.02	K	NIST
Vc	1.288	m3/kmol	Relay (1.0) Calculated Property

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
Cp,solid	633.00	J/mol×K	298.15	NIST
ΔfusH	[42.73; 42.73]	kJ/mol	[304.96; 305.09]
ΔfusH	42.73	kJ/mol	304.96	NIST
ΔfusH	42.73	kJ/mol	305.00	NIST
ΔfusH	42.73	kJ/mol	305.09	NIST
ΔfusS	[140.10; 140.10]	J/mol×K	[304.96; 305.09]
ΔfusS	140.10	J/mol×K	304.96	NIST
ΔfusS	140.10	J/mol×K	305.09	NIST

Similar Compounds

Find more compounds similar to 2,2,4,4,6,6-Hexamethyl-8,8-diphenyl-[1,3,5,7,2,4,6,8]cyclotetrasiloxane.

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
• NIST Webbook

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