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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-6927.374005
Energy at 298.15K 
HF Energy-6927.236461
Nuclear repulsion energy116.595872
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 3133 2918 13.48      
2 A1 1391 1296 31.35      
3 A1 536 499 3.79      
4 E 3232 3011 3.38      
4 E 3232 3011 3.38      
5 E 1564 1457 9.72      
5 E 1564 1457 9.72      
6 E 945 880 8.63      
6 E 945 880 8.63      

Unscaled Zero Point Vibrational Energy (zpe) 8269.2 cm-1
Scaled (by 0.9316) Zero Point Vibrational Energy (zpe) 7703.6 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
5.19869 0.23643 0.23643

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 -1.869
I2 0.000 0.000 0.336
H3 0.000 1.036 -2.205
H4 0.897 -0.518 -2.205
H5 -0.897 -0.518 -2.205

Atom - Atom Distances (Å)
  C1 I2 H3 H4 H5
C12.20561.08861.08861.0886
I22.20562.74392.74392.7439
H31.08862.74391.79371.7937
H41.08862.74391.79371.7937
H51.08862.74391.79371.7937

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 107.944 I2 C1 H4 107.944
I2 C1 H5 107.944 H3 C1 H4 110.954
H3 C1 H5 110.954 H4 C1 H5 110.954
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability