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All results from a given calculation for CH3I (methyl iodide)

using model chemistry: CID/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at CID/3-21G*
 hartrees
Energy at 0K-6927.515774
Energy at 298.15K 
HF Energy-6927.303431
Nuclear repulsion energy117.151684
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 CID/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3143 2925 10.22      
2 A1 1388 1292 29.95      
3 A1 553 515 4.83      
4 E 3246 3020 0.86      
4 E 3246 3020 0.86      
5 E 1571 1462 7.34      
5 E 1571 1462 7.34      
6 E 950 884 8.30      
6 E 950 884 8.30      

Unscaled Zero Point Vibrational Energy (zpe) 8308.7 cm-1
Scaled (by 0.9305) Zero Point Vibrational Energy (zpe) 7731.2 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 CID/3-21G*
ABC
5.18329 0.23892 0.23892

See section I.F.4 to change rotational constant units
Geometric Data calculated at CID/3-21G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.861
I2 0.000 0.000 0.334
H3 0.000 1.037 -2.188
H4 0.898 -0.519 -2.188
H5 -0.898 -0.519 -2.188

Atom - Atom Distances (Å)
  C1 I2 H3 H4 H5
C12.19511.08761.08761.0876
I22.19512.72742.72742.7274
H31.08762.72741.79641.7964
H41.08762.72741.79641.7964
H51.08762.72741.79641.7964

picture of methyl iodide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 H3 107.519 I2 C1 H4 107.519
I2 C1 H5 107.519 H3 C1 H4 111.350
H3 C1 H5 111.350 H4 C1 H5 111.350
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability