CCCBDB calculation results Page

State	Conformation	minimum conformation	conformer description	state description
1	1	yes	TD	¹A₁

Energy calculated at mPW1PW91/cc-pVDZ

	hartrees
Energy at 0K	-449.161731
Energy at 298.15K	-449.173003
Nuclear repulsion energy	244.477108

The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.

Vibrational Frequencies calculated at mPW1PW91/cc-pVDZ

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3057	2929	0.00
2	A₁	1271	1218	0.00
3	A₁	583	558	0.00
4	A₂	161	154	0.00
5	E	3149	3017	0.00
5	E	3149	3017	0.00
6	E	1435	1375	0.00
6	E	1435	1375	0.00
7	E	827	792	0.00
7	E	827	792	0.00
8	E	183	175	0.00
8	E	183	175	0.00
9	T₁	3149	3018	0.00
9	T₁	3149	3018	0.00
9	T₁	3149	3018	0.00
10	T₁	1432	1372	0.00
10	T₁	1432	1372	0.00
10	T₁	1432	1372	0.00
11	T₁	685	657	0.00
11	T₁	685	657	0.00
11	T₁	685	657	0.00
12	T₁	170	163	0.00
12	T₁	170	163	0.00
12	T₁	170	163	0.00
13	T₂	3151	3020	27.38
13	T₂	3151	3020	27.38
13	T₂	3151	3020	27.38
14	T₂	3054	2927	11.90
14	T₂	3054	2927	11.90
14	T₂	3054	2927	11.90
15	T₂	1449	1389	5.29
15	T₂	1449	1389	5.29
15	T₂	1449	1389	5.29
16	T₂	1263	1211	28.60
16	T₂	1263	1211	28.60
16	T₂	1263	1211	28.60
17	T₂	876	839	133.69
17	T₂	876	839	133.69
17	T₂	876	839	133.69
18	T₂	700	671	11.23
18	T₂	700	671	11.23
18	T₂	700	671	11.23
19	T₂	224	215	2.13
19	T₂	224	215	2.13
19	T₂	224	215	2.13

Unscaled Zero Point Vibrational Energy (zpe) 32358.3 cm^-1
Scaled (by 0.9583) Zero Point Vibrational Energy (zpe) 31008.9 cm^-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.

Rotational Constants (cm^-1) from geometry optimized at mPW1PW91/cc-pVDZ

A	B	C
0.10206	0.10206	0.10206

See section I.F.4 to change rotational constant units

Geometric Data calculated at mPW1PW91/cc-pVDZ

Point Group is T_d

Cartesians (Å)

Atom	x (Å)	y (Å)	z (Å)
Si1	0.000	0.000	0.000
C2	1.092	1.092	1.092
C3	-1.092	-1.092	1.092
C4	-1.092	1.092	-1.092
C5	1.092	-1.092	-1.092
H6	1.740	0.482	1.740
H7	1.740	1.740	0.482
H8	0.482	1.740	1.740
H9	-1.740	-1.740	0.482
H10	-0.482	-1.740	1.740
H11	-1.740	-0.482	1.740
H12	-1.740	0.482	-1.740
H13	-1.740	1.740	-0.482
H14	-0.482	1.740	-1.740
H15	1.740	-1.740	-0.482
H16	0.482	-1.740	-1.740
H17	1.740	-0.482	-1.740

Atom - Atom Distances (Å)

	Si1	C2	C3	C4	C5	H6	H7	H8	H9	H10	H11	H12	H13	H14	H15	H16	H17
Si1		1.8914	1.8914	1.8914	1.8914	2.5076	2.5076	2.5076	2.5076	2.5076	2.5076	2.5076	2.5076	2.5076	2.5076	2.5076	2.5076
C2	1.8914		3.0886	3.0886	3.0886	1.1009	1.1009	1.1009	4.0513	3.3043	3.3043	4.0513	3.3043	3.3043	3.3043	4.0513	3.3043
C3	1.8914	3.0886		3.0886	3.0886	3.3043	4.0513	3.3043	1.1009	1.1009	1.1009	3.3043	3.3043	4.0513	3.3043	3.3043	4.0513
C4	1.8914	3.0886	3.0886		3.0886	4.0513	3.3043	3.3043	3.3043	4.0513	3.3043	1.1009	1.1009	1.1009	4.0513	3.3043	3.3043
C5	1.8914	3.0886	3.0886	3.0886		3.3043	3.3043	4.0513	3.3043	3.3043	4.0513	3.3043	4.0513	3.3043	1.1009	1.1009	1.1009
H6	2.5076	1.1009	3.3043	4.0513	3.3043		1.7790	1.7790	4.3165	3.1427	3.6113	4.9217	4.3165	4.3165	3.1427	4.3165	3.6113
H7	2.5076	1.1009	4.0513	3.3043	3.3043	1.7790		1.7790	4.9217	4.3165	4.3165	4.3165	3.6113	3.1427	3.6113	4.3165	3.1427
H8	2.5076	1.1009	3.3043	3.3043	4.0513	1.7790	1.7790		4.3165	3.6113	3.1427	4.3165	3.1427	3.6113	4.3165	4.9217	4.3165
H9	2.5076	4.0513	1.1009	3.3043	3.3043	4.3165	4.9217	4.3165		1.7790	1.7790	3.1427	3.6113	4.3165	3.6113	3.1427	4.3165
H10	2.5076	3.3043	1.1009	4.0513	3.3043	3.1427	4.3165	3.6113	1.7790		1.7790	4.3165	4.3165	4.9217	3.1427	3.6113	4.3165
H11	2.5076	3.3043	1.1009	3.3043	4.0513	3.6113	4.3165	3.1427	1.7790	1.7790		3.6113	3.1427	4.3165	4.3165	4.3165	4.9217
H12	2.5076	4.0513	3.3043	1.1009	3.3043	4.9217	4.3165	4.3165	3.1427	4.3165	3.6113		1.7790	1.7790	4.3165	3.1427	3.6113
H13	2.5076	3.3043	3.3043	1.1009	4.0513	4.3165	3.6113	3.1427	3.6113	4.3165	3.1427	1.7790		1.7790	4.9217	4.3165	4.3165
H14	2.5076	3.3043	4.0513	1.1009	3.3043	4.3165	3.1427	3.6113	4.3165	4.9217	4.3165	1.7790	1.7790		4.3165	3.6113	3.1427
H15	2.5076	3.3043	3.3043	4.0513	1.1009	3.1427	3.6113	4.3165	3.6113	3.1427	4.3165	4.3165	4.9217	4.3165		1.7790	1.7790
H16	2.5076	4.0513	3.3043	3.3043	1.1009	4.3165	4.3165	4.9217	3.1427	3.6113	4.3165	3.1427	4.3165	3.6113	1.7790		1.7790
H17	2.5076	3.3043	4.0513	3.3043	1.1009	3.6113	3.1427	4.3165	4.3165	4.3165	4.9217	3.6113	4.3165	3.1427	1.7790	1.7790

picture of tetramethylsilane state 1 conformation 1

More geometry information
Calculated Bond Angles

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
Si1	C2	H6	111.096	Si1	C2	H7	111.096
Si1	C2	H8	111.096	Si1	C3	H9	111.096
Si1	C3	H10	111.096	Si1	C3	H11	111.096
Si1	C4	H12	111.096	Si1	C4	H13	111.096
Si1	C4	H14	111.096	Si1	C5	H15	111.096
Si1	C5	H16	111.096	Si1	C5	H17	111.096
C2	Si1	C3	109.471	C2	Si1	C4	109.471
C2	Si1	C5	109.471	C3	Si1	C4	109.471
C3	Si1	C5	109.471	C4	Si1	C5	109.471
H6	C2	H7	107.799	H6	C2	H8	107.799
H7	C2	H8	107.799	H9	C3	H10	107.799
H9	C3	H11	107.799	H10	C3	H11	107.799
H12	C4	H13	107.799	H12	C4	H14	107.799
H13	C4	H14	107.799	H15	C5	H16	107.799
H15	C5	H17	107.799	H16	C5	H17	107.799

Electronic energy levels

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/cc-pVDZ Charges (e)

Number	Element	Mulliken
1	Si	0.343
2	C	-0.255
3	C	-0.255
4	C	-0.255
5	C	-0.255
6	H	0.056
7	H	0.056
8	H	0.056
9	H	0.056
10	H	0.056
11	H	0.056
12	H	0.056
13	H	0.056
14	H	0.056
15	H	0.056
16	H	0.056
17	H	0.056

Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)

	x	y	z	Total
	0.000	0.000	0.000	0.000
CHELPG
AIM
ESP

Electric Quadrupole moment
Quadrupole components in D Å

Primitive
	x	y	z
x	-41.687	0.000	0.000
y	0.000	-41.687	0.000
z	0.000	0.000	-41.687

Traceless
	x	y	z
x	0.000	0.000	0.000
y	0.000	0.000	0.000
z	0.000	0.000	0.000

Polar
3z²-r²	0.000
x²-y²	0.000
xy	0.000
xz	0.000
yz	0.000

Polarizabilities
Components of the polarizability tensor.
Units are Å³ (Angstrom cubed)
Change units.

	x	y	z
x	10.115	0.000	0.000
y	0.000	10.115	0.000
z	0.000	0.000	10.115

<r²> (average value of r²) Å²

<r²>	187.352
(<r²>)^1/2	13.688

All results from a given calculation for Si(CH₃)₄ (tetramethylsilane)

using model chemistry: mPW1PW91/cc-pVDZ

States and conformations

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
	Home All data for one species Geometry Experimental Experimental Geometries Same bond/angle many molecules Internal Coordinates by type Bond angles Calculated Calculated geometry Rotational constant Moments of inertia Products of moments of inertia BSE Bond lengths Show me a calculated geometry Comparisons Bonds, angles Rotational Constants Products of moments of inertia Point group Bad Calculations Bad moment of inertia Tutorials and Explanations Angle formulas Vibrations Experimental Vibrational frequencies Calculated Frequencies Scale factors Reactions Entropies Ions List Ions Energy Calculated Ionization Energy Compare Ionzation energy Electron Affinity Calculated Electron affinity Compare Electron affinity Proton Affinity Calculated Proton affinity Compare Proton affinity Ionization changes point group Experimental One molecule all properties One property a few molecules Enthalpy of formation Entropy Integrated Heat Capacity Heat Capacity Rotational Constants Vibrational Frequencies Dipole moment Ionization Energy Polarizability Quadrupole Point Groups Geometry Experimental Geometries Internal Coordinates by type Bond angles Rotational Constants Point Groups Diatomic bond lengths Vibrations Vibrational frequencies Diatomic Triatomics Energy Atomization Energy Internal Rotation Electrostatics Dipole Quadrupole Polarizability Reference Data Reference states Spin Splittings Molecules with good enthalpy Enthalpy at 0 Kelvin Calculated Energy Optimized Energy Energy 298K Minimum conformation Hydrogen bonds H bond with counterpoise Reaction Reaction Energy 0K Reaction Energy 298K Internal Rotation Barriers to internal rotation Rotational barrier and dipole Rotational Barrier 2 molecules Orbital HOMO LUMO gap HOMO Orbital Energies Nuclear repulsion energy Correlation Full vs Frozen core energies Partial correlation energies Ion Calculated Ionization Energy Vertical ionization Energy Calculated Electron affinity Calculated Proton affinity Atom charge differences Excited State Singlet triplet gap Electronic state Transition state Basis Set Extrapolation BSE energy BSE Bond lengths Geometry Calculated geometry AIM bond orders One type of bond Rotation Rotational constant Products of moments of inertia Moments of inertia Inertial defects Second moments Point group State symmetry <r2> Sorted by r2 Z-matrix Bad Calculations Bad moment of inertia Bad Calculated Bond Lengths Bad point group Worst molecules Vibrations Frequencies Animated vibrations Anharmonic Zero point energy (ZPE) Scale Factors Scale factors Scale factor uncertainty Calculate a scale factor Why scale vibrations Set scaling factors Bad Calculations Bad Vib. HF vs MP2 Bad vib. Calc. vs exp. Big anharmonicity Electrostatics Charges Mulliken CHELP Aim ESP Dipole Dipole Dipole angle Dipole calculation types Quadrupole Polarizability Spin Spin density Entropy and Heat Capacity Entropy Reaction entropy Heat Capacity Reaction Reaction Energy 0K Reaction Energy 298K Isodesmic reactions Transition State Transition state Transition state frequencies Transition state geometries IRC Lookup by property By frequency Comparisons Geometry Bonds, angles Bond, angle, or dihedral DFT grid size on point group DFT grid on bond length Core correlation - bond length Same bond/angle many molecules Isoelectronic diatomics Isoelectronic triatomic angles Average bond lengths Rotation Rotational Constants Products of moments of inertia Point group Vibrations Vibrations 2 calculations Frequency differences One frequency Zero point energy Intensity Intensity for one mode Vibrational intensities Reduced mass comparison Anharmonic Triatomic Scale factors Energy Reaction Reaction Energy 0K Reaction Energy 298K Atomization 0K Atomization 298K Single point vs optimized DFT grid size on energy Semiempirical enthalpy Internal rotation Similar molecules Conformation Sets of isomers Sets of tautomers Isomers Entropy Entropy Heat capacity Entropy of several molecules Integrated heat capacity Reaction entropy Electrostatics Dipole Polarizability Several molecules Quadrupole Ion Compare Ionzation energy Koopman ionization energy Koopman IE for a few molecules Compare Electron affinity Compare Proton affinity Protonation Site Resources Info on Results Calculations Done Method and basis set List molecules One molecule Multiple conformers, states Multiple conformers, states Basis functions used I/O files Input/output files MOL file Z-matrix wfn files Glossary Conversion Forms B to I, I to B Angle formulas Integrated heat Capacity Calculating Enthalpy Links NIST Links NIST webbook bibliographic data CCCBDB Experimental data External links Basis Set Exchange Computational Chemistry List Thermochemistry in Gaussian Minnesota Database Collection Benchmark Energy and Geometry Point Groups Thermochemistry Thermochemistry Molecules with good enthalpy A → B + C Reference states Tutorials Vibrations Why scale vibrations Zero-point energies Entropy Methyl rotor entropy Entropy and conformations Energy Getting enthalpy of formation Vertical vs adiabatic IE Thermo from calculations Electrostatics Dipole parts by point group Quadrupoles Geometry Angle formulas Cost Cost Comparison Timings Comparison Bad Calculations Geometry Bad moment of inertia Bad Calculated Bond Lengths Bad point group Worst molecules Vibrations Bad vib. Calc. vs exp. Bad Vib. HF vs MP2 Bad scale factors Low excited states Oddities NaCN Is not linear FAQ Help Units Choose Units Energy Bond length Rotational Constant Moment of Inertia Dipole and Quadrupole Polarizability Explanations Hartree cm-1 Debye Credits Just show me Show me a calculated geometry Summary Using older interface Limit Basis sets Method options List Recent molecules Choose a few Molecules Number of atoms By heavy atoms Diatomics InChI Deuterated Dimers Geometry Point group Point group count Bonds types Isodesmic reactions Bad point group Multiple conformers, states Vibrations Big anharmonicity Energy Enthalpy at 0 Kelvin Similar molecules Similar Isomers Cis/trans Tautomers Multiple conformers, states Ions, Dipoles, etc. List Ions Ionization changes point group Dipole Quadrupole Polarizability Proton Affinities Index of CCCBDB Feedback Error form Wants
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for Si(CH3)4 (tetramethylsilane)

using model chemistry: mPW1PW91/cc-pVDZ

States and conformations

All results from a given calculation for Si(CH₃)₄ (tetramethylsilane)