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All results from a given calculation for C4H6 (1-Methylcyclopropene)

using model chemistry: MP2/CEP-31G*

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/CEP-31G*
 hartrees
Energy at 0K-25.817334
Energy at 298.15K 
HF Energy-25.332513
Nuclear repulsion energy57.182190
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/CEP-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' 3304 3137 0.17 87.05 0.35 0.52
2 A' 3197 3036 19.04 66.17 0.75 0.85
3 A' 3109 2952 68.46 124.93 0.16 0.27
4 A' 3086 2929 29.72 166.96 0.00 0.00
5 A' 1829 1736 11.42 19.95 0.13 0.23
6 A' 1541 1463 5.43 9.28 0.69 0.82
7 A' 1508 1432 9.63 14.92 0.67 0.80
8 A' 1431 1358 0.01 4.76 0.62 0.76
9 A' 1215 1154 6.98 6.93 0.29 0.45
10 A' 1078 1023 1.61 8.98 0.17 0.29
11 A' 1058 1005 39.66 1.24 0.23 0.37
12 A' 987 937 6.83 11.72 0.32 0.48
13 A' 932 885 15.40 5.19 0.43 0.60
14 A' 671 637 0.96 13.82 0.64 0.78
15 A' 315 299 2.33 1.22 0.73 0.84
16 A" 3202 3040 53.15 63.66 0.75 0.86
17 A" 3179 3018 20.61 65.30 0.75 0.86
18 A" 1503 1427 9.98 14.39 0.75 0.86
19 A" 1109 1052 0.22 0.22 0.75 0.86
20 A" 1045 992 0.35 5.18 0.75 0.86
21 A" 1001 950 3.42 10.30 0.75 0.86
22 A" 697 662 52.09 5.81 0.75 0.86
23 A" 297 282 20.31 1.12 0.75 0.86
24 A" 146 138 0.19 0.64 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 18719.3 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 17772.1 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/CEP-31G*
ABC
0.66271 0.20376 0.16609

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.185 0.000
C2 -0.069 -1.351 0.000
C3 1.181 -0.443 0.000
C4 -0.842 1.433 0.000
H5 -0.349 -1.876 0.927
H6 -0.349 -1.876 -0.927
H7 2.270 -0.419 0.000
H8 -0.206 2.334 0.000
H9 -1.494 1.446 -0.892
H10 -1.494 1.446 0.892

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10
C11.53701.33751.50572.28682.28682.34842.15882.14932.1493
C21.53701.54492.88911.10221.10222.51703.68703.26373.2637
C31.33751.54492.75902.29302.29301.08863.10363.39433.3943
C41.50572.88912.75903.47173.47173.62111.10311.10481.1048
H52.28681.10222.29303.47171.85473.13744.31333.95743.5145
H62.28681.10222.29303.47171.85473.13744.31333.51453.9574
H72.34842.51701.08863.62113.13743.13743.70184.29404.2940
H82.15883.68703.10361.10314.31334.31333.70181.80071.8007
H92.14933.26373.39431.10483.95743.51454.29401.80071.7844
H102.14933.26373.39431.10483.51453.95744.29401.80071.7844

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 51.442 H1 C2 C6 119.185
C2 C3 C6 24.835 C2 C3 C10 71.914
C2 C6 C3 36.064 C2 C6 H4 49.987
C2 C6 H5 32.721 C3 C2 C6 119.100
C3 C6 H4 52.472 C3 C6 H5 66.146
C3 C10 H7 9.206 C3 C10 H8 65.179
C3 C10 H9 74.760 H4 C6 H5 74.508
C6 C3 C10 85.881 H7 C10 H8 58.945
H7 C10 H9 78.008 H8 C10 H9 60.298
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability