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

using model chemistry: CCSD(T)/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 CCSD(T)/3-21G
 hartrees
Energy at 0K-6927.386436
Energy at 298.15K 
HF Energy-6927.236036
Nuclear repulsion energy115.839070
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 CCSD(T)/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 3072 3043        
2 A1 1355 1342        
3 A1 509 504        
4 E 3174 3144        
4 E 3174 3144        
5 E 1540 1526        
5 E 1540 1525        
6 E 923 914        
6 E 923 914        

Unscaled Zero Point Vibrational Energy (zpe) 8104.4 cm-1
Scaled (by 0.9906) Zero Point Vibrational Energy (zpe) 8028.2 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 CCSD(T)/3-21G
ABC
5.14491 0.23325 0.23325

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.883
I2 0.000 0.000 0.339
H3 0.000 1.041 -2.216
H4 0.902 -0.521 -2.216
H5 -0.902 -0.521 -2.216

Atom - Atom Distances (Å)
  C1 I2 H3 H4 H5
C12.22181.09281.09281.0928
I22.22182.75822.75822.7582
H31.09282.75821.80311.8031
H41.09282.75821.80311.8031
H51.09282.75821.80311.8031

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 107.708 I2 C1 H4 107.708
I2 C1 H5 107.708 H3 C1 H4 111.176
H3 C1 H5 111.176 H4 C1 H5 111.175
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability