return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH3CHCH3 (Isopropyl radical)

using model chemistry: MP2/CEP-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 2A
Energy calculated at MP2/CEP-31G
 hartrees
Energy at 0K-20.669276
Energy at 298.15K-20.675502
HF Energy-20.442942
Nuclear repulsion energy43.355398
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/CEP-31G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3183 3076 80.86      
2 A' 3128 3023 42.76      
3 A' 3081 2977 107.60      
4 A' 2993 2892 47.51      
5 A' 1529 1478 7.18      
6 A' 1508 1457 17.95      
7 A' 1461 1412 5.12      
8 A' 1211 1170 5.17      
9 A' 1069 1033 0.20      
10 A' 881 852 1.41      
11 A' 443 428 42.02      
12 A' 351 339 6.87      
13 A' 152 147 0.14      
14 A" 3128 3023 37.63      
15 A" 3079 2975 8.30      
16 A" 2991 2890 46.94      
17 A" 1520 1469 1.13      
18 A" 1500 1449 1.30      
19 A" 1453 1404 10.37      
20 A" 1397 1350 5.72      
21 A" 1160 1121 0.13      
22 A" 976 943 0.61      
23 A" 955 923 1.69      
24 A" 108 105 0.01      

Unscaled Zero Point Vibrational Energy (zpe) 19628.3 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 18966.8 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/CEP-31G
ABC
1.17967 0.26349 0.23537

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.014 0.563 0.000
C2 -0.014 -0.208 1.335
C3 -0.014 -0.208 -1.335
H4 0.334 1.611 0.000
H5 -0.778 -1.017 1.319
H6 -0.778 -1.017 -1.319
H7 0.973 -0.694 1.533
H8 -0.235 0.466 2.189
H9 0.973 -0.694 -1.533
H10 -0.235 0.466 -2.189

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7 H8 H9 H10
C11.54131.54131.10432.19562.19562.21442.20232.21442.2023
C21.54132.66932.28271.11292.87801.11821.11073.07163.5945
C31.54132.66932.28272.87801.11293.07163.59451.11821.1107
H41.10432.28272.28273.14383.14382.84032.53472.84032.5347
H52.19561.11292.87803.14382.63901.79431.80353.36323.8479
H62.19562.87801.11293.14382.63903.36323.84791.79431.8035
H72.21441.11823.07162.84031.79433.36321.79863.06614.0816
H82.20231.11073.59452.53471.80353.84791.79864.08164.3782
H92.21443.07161.11822.84033.36321.79433.06614.08161.7986
H102.20233.59451.11072.53473.84791.80354.08164.37821.7986

picture of Isopropyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.593 C1 C2 H7 111.761
C1 C2 H8 111.247 C1 C3 H6 110.593
C1 C3 H9 111.761 C1 C3 H10 111.247
C2 C1 C3 119.978 C2 C1 H4 118.335
C3 C1 H4 118.335 H5 C2 H7 107.070
H5 C2 H8 108.395 H6 C3 H9 107.070
H6 C3 H10 108.395 H7 C2 H8 107.599
H9 C3 H10 107.599
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability