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: QCISD/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 2A
Energy calculated at QCISD/6-31G**
 hartrees
Energy at 0K-118.108421
Energy at 298.15K-118.114720
HF Energy-117.647294
Nuclear repulsion energy75.383441
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 QCISD/6-31G**
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' 3243 3053 33.17      
2 A' 3180 2993 24.94      
3 A' 3126 2943 56.32      
4 A' 3048 2869 39.80      
5 A' 1552 1461 2.75      
6 A' 1541 1451 8.83      
7 A' 1473 1386 1.91      
8 A' 1219 1147 1.78      
9 A' 1080 1017 0.16      
10 A' 910 856 1.30      
11 A' 438 413 16.79      
12 A' 364 342 4.45      
13 A' 155 146 0.13      
14 A" 3180 2993 25.61      
15 A" 3125 2942 6.00      
16 A" 3044 2865 25.88      
17 A" 1543 1453 0.36      
18 A" 1531 1441 0.82      
19 A" 1474 1388 4.68      
20 A" 1418 1335 4.95      
21 A" 1182 1113 0.02      
22 A" 977 920 0.72      
23 A" 965 908 0.19      
24 A" 129 121 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 19947.3 cm-1
Scaled (by 0.9414) Zero Point Vibrational Energy (zpe) 18778.4 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 QCISD/6-31G**
ABC
1.24129 0.27790 0.24834

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.014 0.544 0.000
C2 -0.014 -0.200 1.297
C3 -0.014 -0.200 -1.297
H4 0.306 1.579 0.000
H5 -0.759 -1.000 1.290
H6 -0.759 -1.000 -1.290
H7 0.957 -0.676 1.495
H8 -0.229 0.458 2.139
H9 0.957 -0.676 -1.495
H10 -0.229 0.458 -2.139

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7 H8 H9 H10
C11.49561.49561.08342.14572.14572.15982.15182.15982.1518
C21.49562.59472.22521.09332.80931.09861.09052.99403.5058
C31.49562.59472.22522.80931.09332.99403.50581.09861.0905
H41.08342.22522.22523.07423.07422.78282.47372.78282.4737
H52.14571.09332.80933.07422.58091.75821.76853.28753.7644
H62.14572.80931.09333.07422.58093.28753.76441.75821.7685
H72.15981.09862.99402.78281.75823.28751.76312.98973.9875
H82.15181.09053.50582.47371.76853.76441.76313.98754.2786
H92.15982.99401.09862.78283.28751.75822.98973.98751.7631
H102.15183.50581.09052.47373.76441.76853.98754.27861.7631

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 110.997 C1 C2 H7 111.812
C1 C2 H8 111.665 C1 C3 H6 110.997
C1 C3 H9 111.812 C1 C3 H10 111.665
C2 C1 C3 120.319 C2 C1 H4 118.386
C3 C1 H4 118.386 H5 C2 H7 106.674
H5 C2 H8 108.158 H6 C3 H9 106.674
H6 C3 H10 108.158 H7 C2 H8 107.298
H9 C3 H10 107.298
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability