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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: QCISD/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD/6-311G*
 hartrees
Energy at 0K-156.721623
Energy at 298.15K-156.730248
HF Energy-156.121002
Nuclear repulsion energy123.843845
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/6-311G*
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' 3227 3090 33.00      
2 A' 3150 3015 17.36      
3 A' 3138 3004 16.67      
4 A' 3099 2967 23.01      
5 A' 3028 2899 32.79      
6 A' 1550 1484 1.39      
7 A' 1531 1466 10.18      
8 A' 1463 1401 4.72      
9 A' 1423 1363 1.18      
10 A' 1254 1200 0.06      
11 A' 1232 1180 0.06      
12 A' 1085 1038 8.48      
13 A' 1018 974 10.17      
14 A' 957 916 2.91      
15 A' 810 775 4.64      
16 A' 785 751 3.58      
17 A' 369 354 0.19      
18 A" 3213 3076 0.25      
19 A" 3131 2998 24.12      
20 A" 3098 2966 33.35      
21 A" 1522 1457 2.52      
22 A" 1495 1432 3.97      
23 A" 1219 1167 0.75      
24 A" 1170 1120 0.03      
25 A" 1131 1083 4.36      
26 A" 1089 1043 1.56      
27 A" 892 854 8.73      
28 A" 840 804 5.35      
29 A" 347 332 0.68      
30 A" 220 211 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24242.3 cm-1
Scaled (by 0.9574) Zero Point Vibrational Energy (zpe) 23209.6 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/6-311G*
ABC
0.51787 0.21033 0.18469

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-311G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.348 0.405 0.000
C2 -0.884 1.286 0.000
H3 1.295 0.944 0.000
C4 0.348 -0.902 0.758
C5 0.348 -0.902 -0.758
H6 1.257 -1.206 1.270
H7 1.257 -1.206 -1.270
H8 -0.571 -1.191 1.263
H9 -0.571 -1.191 -1.263
H10 -1.796 0.675 0.000
H11 -0.912 1.930 0.888
H12 -0.912 1.930 -0.888

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51391.09021.51081.51082.24402.24402.23362.23362.16052.16792.1679
C21.51392.20572.62242.62243.52203.52202.79812.79811.09761.09761.0976
H31.09022.20572.20902.20902.49742.49743.10483.10483.10292.57532.5753
C41.51082.62242.20901.51551.08712.24321.08812.23902.76713.10193.5092
C51.51082.62242.20901.51552.24321.08712.23901.08812.76713.50923.1019
H62.24403.52202.49741.08712.24322.54061.82843.12453.80433.83174.3813
H72.24403.52202.49742.24321.08712.54063.12451.82843.80434.38133.8317
H82.23362.79813.10481.08812.23901.82843.12452.52672.56513.16193.8061
H92.23362.79813.10482.23901.08813.12451.82842.52672.56513.80613.1619
H102.16051.09763.10292.76712.76713.80433.80432.56512.56511.77321.7732
H112.16791.09762.57533.10193.50923.83174.38133.16193.80611.77321.7766
H122.16791.09762.57533.50923.10194.38133.83173.80613.16191.77321.7766

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.637 C1 C2 H11 111.230
C1 C2 H12 111.230 C1 C4 H5 59.897
C1 C4 H6 118.577 C1 C4 H8 117.583
C1 H5 C4 59.897 C1 H5 H7 118.577
C1 H5 H9 117.583 C2 C1 C3 114.803
C2 C1 C4 120.218 C2 C1 H5 120.218
C3 C1 C4 115.317 C3 C1 H5 115.317
C4 C1 H5 60.205 C4 H5 H7 118.130
C4 H5 H9 117.687 H5 C4 H6 118.130
H5 C4 H8 117.687 H6 C4 H8 114.397
H7 H5 H9 114.397 H10 C2 H11 107.765
H10 C2 H12 107.765 H11 C2 H12 108.066
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability