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

using model chemistry: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-6927.512323
Energy at 298.15K 
HF Energy-6927.303343
Nuclear repulsion energy117.000926
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 MP2/3-21G*
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 3132 2980 7.36      
2 A1 1376 1309 31.48      
3 A1 548 521 5.31      
4 E 3242 3084 0.39      
4 E 3242 3084 0.39      
5 E 1568 1492 6.97      
5 E 1568 1492 6.97      
6 E 945 899 8.42      
6 E 945 899 8.42      

Unscaled Zero Point Vibrational Energy (zpe) 8283.5 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 7880.1 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 MP2/3-21G*
ABC
5.16306 0.23830 0.23830

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.864
I2 0.000 0.000 0.335
H3 0.000 1.039 -2.188
H4 0.900 -0.520 -2.188
H5 -0.900 -0.520 -2.188

Atom - Atom Distances (Å)
  C1 I2 H3 H4 H5
C12.19881.08861.08861.0886
I22.19882.72862.72862.7286
H31.08862.72861.79991.7999
H41.08862.72861.79991.7999
H51.08862.72861.79991.7999

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 107.328 I2 C1 H4 107.328
I2 C1 H5 107.328 H3 C1 H4 111.527
H3 C1 H5 111.527 H4 C1 H5 111.527
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability