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 C4H8 (methylcyclopropane)

using model chemistry: CCD/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CCD/6-31G*
 hartrees
Energy at 0K-156.659996
Energy at 298.15K-156.668658
HF Energy-156.095091
Nuclear repulsion energy124.084287
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 CCD/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' 3262 3088 25.75      
2 A' 3184 3013 12.35      
3 A' 3177 3007 18.72      
4 A' 3142 2974 18.34      
5 A' 3067 2903 27.33      
6 A' 1577 1493 1.06      
7 A' 1554 1471 7.05      
8 A' 1484 1404 3.25      
9 A' 1446 1368 1.70      
10 A' 1276 1208 0.14      
11 A' 1250 1183 0.06      
12 A' 1116 1056 6.68      
13 A' 1036 981 9.36      
14 A' 971 919 3.16      
15 A' 824 780 4.71      
16 A' 799 756 2.35      
17 A' 374 354 0.19      
18 A" 3250 3076 0.23      
19 A" 3171 3001 19.79      
20 A" 3145 2977 28.07      
21 A" 1546 1463 1.77      
22 A" 1520 1439 2.02      
23 A" 1237 1171 0.45      
24 A" 1195 1131 0.28      
25 A" 1147 1085 4.26      
26 A" 1117 1057 1.50      
27 A" 914 865 7.27      
28 A" 852 807 4.79      
29 A" 349 331 0.65      
30 A" 226 214 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24603.4 cm-1
Scaled (by 0.9465) Zero Point Vibrational Energy (zpe) 23287.2 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 CCD/6-31G*
ABC
0.52061 0.21107 0.18539

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.347 0.402 0.000
C2 -0.882 1.285 0.000
H3 1.292 0.945 0.000
C4 0.347 -0.900 0.754
C5 0.347 -0.900 -0.754
H6 1.254 -1.205 1.271
H7 1.254 -1.205 -1.271
H8 -0.570 -1.190 1.263
H9 -0.570 -1.190 -1.263
H10 -1.794 0.675 0.000
H11 -0.908 1.928 0.889
H12 -0.908 1.928 -0.889

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51241.09021.50501.50502.24042.24042.23012.23012.15772.16582.1658
C21.51242.19992.61752.61753.51743.51742.79632.79631.09751.09731.0973
H31.09022.19992.20642.20642.49752.49753.10243.10243.09762.56782.5678
C41.50502.61752.20641.50881.08742.23981.08832.23532.76243.09673.5030
C51.50502.61752.20641.50882.23981.08742.23531.08832.76243.50303.0967
H62.24043.51742.49751.08742.23982.54121.82463.12253.79953.82524.3759
H72.24043.51742.49752.23981.08742.54123.12251.82463.79954.37593.8252
H82.23012.79633.10241.08832.23531.82463.12252.52682.56343.15883.8038
H92.23012.79633.10242.23531.08833.12251.82462.52682.56343.80383.1588
H102.15771.09753.09762.76242.76243.79953.79952.56342.56341.77361.7736
H112.16581.09732.56783.09673.50303.82524.37593.15883.80381.77361.7772
H122.16581.09732.56783.50303.09674.37593.82523.80383.15881.77361.7772

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.525 C1 C2 H11 111.184
C1 C2 H12 111.184 C1 C4 H5 59.918
C1 C4 H6 118.700 C1 C4 H8 117.718
C1 H5 C4 59.918 C1 H5 H7 118.700
C1 H5 H9 117.718 C2 C1 C3 114.422
C2 C1 C4 120.332 C2 C1 H5 120.332
C3 C1 C4 115.530 C3 C1 H5 115.530
C4 C1 H5 60.164 C4 H5 H7 118.339
C4 H5 H9 117.887 H5 C4 H6 118.339
H5 C4 H8 117.887 H6 C4 H8 113.986
H7 H5 H9 113.986 H10 C2 H11 107.825
H10 C2 H12 107.825 H11 C2 H12 108.158
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability