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Silicon tetrachloride (data page)

This page provides supplementary chemical data on silicon tetrachloride.

Material Safety Data Sheet

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The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source, it this case, noting that one should "avoid all contact! In all cases consult a doctor! ... inhalation causes sore throat and Burning sensation".[1]

Structure and properties

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Structure and properties
Index of refraction, nD 1.41156 at 25 °C
Abbe number ?
Dielectric constant, εr 2.248 ε0 at 0 °C
Bond strength 381 kJ/mol (Si-Cl)
Bond length ?
Bond angle 109° (Cl-Si-Cl)
Dipole#Molecular dipoles 0 D
Magnetic susceptibility −87.5
Viscosity 99.4 mPa.s at 25 °C
96.2 mPa.s at 50 °C
Thermal conductivity 0.099 W/(m K) at 25 °C
0.096 W/(m K) at 50 °C

Thermodynamic properties

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Phase behavior
Triple point ? K (? °C), ? Pa
Critical point 508.1 K (235.0 °C), 3.593 MPa, 0.326vdm3/mol
Std enthalpy change
of fusion, ΔfusHo 		7.60 kJ/mol
Std entropy change
of fusion, ΔfusSo 		? J/(mol·K)
Std enthalpy change
of vaporization, ΔvapHo 		28.7 kJ/mol
Std entropy change
of vaporization, ΔvapSo 		? J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHosolid 		? kJ/mol
Standard molar entropy,
Sosolid 		? J/(mol K)
Heat capacity, cp ? J/(mol K)
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid 		−687.0 kJ/mol
Std Gibbs free energy
of formation, ΔfGoliquid 		−619.8 kJ/mol
Standard molar entropy,
Soliquid 		239.7 J/(mol K)
Heat capacity, cp 145. J/(mol K)
Gas properties
Std enthalpy change
of formation, ΔfHogas 		−657. kJ/mol
Std Gibbs free energy
of formation, ΔfGogas 		−617.0 kJ/mol
Standard molar entropy,
Sogas 		330.7 J/(mol K)
Heat capacity, cp 90. J/(mol K)

Spectral data

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UV-Vis
λmax ? nm
Extinction coefficient, ε ?
IR
Major absorption bands 610, 642 cm−1
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments 		133, 135, 170
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References

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  1. ^ "International Chemical Safety Cards Tetrachlorosilane".
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