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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 3167 0.04 94.24 0.28 0.44
2 A' 3156 3002 12.24 69.82 0.74 0.85
3 A' 3149 2996 34.28 95.67 0.14 0.24
4 A' 3076 2926 14.96 119.44 0.00 0.01
5 A' 1784 1697 8.04 10.31 0.19 0.32
6 A' 1601 1523 5.55 14.42 0.47 0.64
7 A' 1590 1513 8.15 27.26 0.72 0.84
8 A' 1491 1418 0.78 15.15 0.59 0.74
9 A' 1205 1146 6.05 1.17 0.24 0.38
10 A' 1131 1076 1.31 1.12 0.18 0.30
11 A' 1099 1046 52.47 0.77 0.66 0.79
12 A' 972 925 2.37 7.88 0.75 0.86
13 A' 920 875 3.92 12.44 0.30 0.47
14 A' 614 584 0.04 14.11 0.63 0.77
15 A' 333 317 1.74 2.06 0.70 0.82
16 A" 3236 3078 36.87 68.10 0.75 0.86
17 A" 3138 2985 11.68 69.91 0.75 0.86
18 A" 1584 1507 7.41 22.55 0.75 0.86
19 A" 1153 1096 0.17 1.97 0.75 0.86
20 A" 1095 1042 2.15 3.68 0.75 0.86
21 A" 1038 988 2.28 16.71 0.75 0.86
22 A" 729 694 38.67 1.00 0.75 0.86
23 A" 294 279 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 0.9513) Zero Point Vibrational Energy (zpe) 18005.4 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 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