National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 17bSeptember 2015
NIST Standard Reference Database 101
IIExperimental data
IIICalculated data
IVData comparisons
VCost comparisons
VIInput and output files
VIITutorials and Units
VIIILinks to other sites
XOlder CCCBDB versions
XIII Vibrations
XIVReaction data
XVEntropy data
XVIBibliographic data
XVIIIon data
XVIIIBad calculations
XIXIndex of properties
XXH-bond dimers

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II.A.1. (XV.A.)

Listing of experimental data for CH2SiH2 (silaethylene)

State Conformation
1A1 C2V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency (cm-1) Frequency Reference Intensity (km mol-1) Int. unc. Intensity Reference Comment
2 A1 2219 webbook       SiH2 sym stretch
3 A1 1350 webbook       CH2 scissors
4 A1 985 webbook       Si=C stretch
5 A1 927 webbook       SiH2 scissors
7 B1 741 webbook       CH2 wag
10 B2 2239 webbook       SiH2 asym stretch
11 B2 817 webbook       CH2 rock

Calculated vibrational frequencies for CH2SiH2 (silaethylene).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment

Calculated rotational constants for CH2SiH2 (silaethylene).

Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of silaethylene

Point Group C2v

Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees

Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4


Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å


Calculated geometries for CH2SiH2 (silaethylene).

Bond descriptions

Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
C=Si 1
H-C 2
H-Si 2


Atom 1 Atom 2
C1 Si2
C1 H3
C1 H4
Si2 H5
Si2 H6
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
Calculated electric dipole moments for CH2SiH2 (silaethylene).
Electric quadrupole moment quadrupole
Calculated electric quadrupole moments for CH2SiH2 (silaethylene).

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