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 C4H6 (1-Methylcyclopropene)

using model chemistry: MP2/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at MP2/3-21G
 hartrees
Energy at 0K-154.351339
Energy at 298.15K 
HF Energy-153.987605
Nuclear repulsion energy106.834216
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 MP2/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3330 3178 0.04 94.24 0.28 0.44
2 A' 3156 3012 12.24 69.82 0.74 0.85
3 A' 3149 3006 34.28 95.67 0.14 0.24
4 A' 3076 2936 14.96 119.44 0.00 0.01
5 A' 1784 1703 8.04 10.31 0.19 0.32
6 A' 1601 1528 5.55 14.42 0.47 0.64
7 A' 1590 1518 8.15 27.26 0.72 0.84
8 A' 1491 1423 0.78 15.15 0.59 0.74
9 A' 1205 1150 6.05 1.17 0.24 0.38
10 A' 1131 1080 1.31 1.12 0.18 0.30
11 A' 1099 1049 52.47 0.77 0.66 0.79
12 A' 972 928 2.37 7.88 0.75 0.86
13 A' 920 878 3.92 12.44 0.30 0.47
14 A' 614 586 0.04 14.11 0.63 0.77
15 A' 333 318 1.74 2.06 0.70 0.82
16 A" 3236 3088 36.87 68.10 0.75 0.86
17 A" 3138 2995 11.68 69.91 0.75 0.86
18 A" 1584 1512 7.41 22.55 0.75 0.86
19 A" 1153 1100 0.17 1.97 0.75 0.86
20 A" 1095 1046 2.15 3.68 0.75 0.86
21 A" 1038 991 2.28 16.71 0.75 0.86
22 A" 729 696 38.67 1.00 0.75 0.86
23 A" 294 280 14.44 1.30 0.75 0.86
24 A" 137 131 0.41 0.34 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 18927.2 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 18066.0 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 MP2/3-21G
ABC
0.66724 0.20685 0.16825

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.180 0.000
C2 -0.129 -1.364 0.000
C3 1.142 -0.469 0.000
C4 -0.762 1.459 0.000
H5 -0.416 -1.867 0.919
H6 -0.416 -1.867 -0.919
H7 2.215 -0.451 0.000
H8 -0.078 2.313 0.000
H9 -1.405 1.520 -0.886
H10 -1.405 1.520 0.886

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10
C11.54971.31341.48832.28222.28222.30312.13472.13432.1343
C21.54971.55382.89291.08611.08612.51533.67803.27623.2762
C31.31341.55382.70932.28562.28561.07363.03803.35093.3509
C41.48832.89292.70933.46753.46753.53681.09531.09671.0967
H52.28221.08612.28563.46751.83753.12604.29373.96343.5287
H62.28221.08612.28563.46751.83753.12604.29373.52873.9634
H72.30312.51531.07363.53683.12603.12603.59134.21614.2161
H82.13473.67803.03801.09534.29374.29373.59131.78271.7827
H92.13433.27623.35091.09673.96343.52874.21611.78271.7726
H102.13433.27623.35091.09673.52873.96344.21611.78271.7726

picture of 1-Methylcyclopropene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 C2 C3 50.072 H1 C2 C6 118.908
C2 C3 C6 24.587 C2 C3 C10 73.777
C2 C6 C3 36.531 C2 C6 H4 50.073
C2 C6 H5 32.230 C3 C2 C6 118.882
C3 C6 H4 51.316 C3 C6 H5 66.299
C3 C10 H7 9.701 C3 C10 H8 64.323
C3 C10 H9 74.663 H4 C6 H5 74.636
C6 C3 C10 87.217 H7 C10 H8 57.592
H7 C10 H9 77.865 H8 C10 H9 60.186
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability