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

using model chemistry: PM3

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
Energy calculated at PM3
 hartrees
Energy at 0K 
Energy at 298.15K0.091378
HF Energy0.091378
Nuclear repulsion energy69.458609
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 PM3
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' 3289 3204 74.66 20.68 0.42 0.59
2 A' 3159 3076 1.56 148.26 0.00 0.01
3 A' 3100 3020 0.00 88.05 0.16 0.27
4 A' 3076 2996 0.65 104.73 0.73 0.84
5 A' 2088 2033 1.99 244.85 0.22 0.36
6 A' 1429 1392 4.65 26.29 0.62 0.76
7 A' 1394 1357 0.77 52.26 0.62 0.77
8 A' 1380 1344 1.40 52.69 0.67 0.80
9 A' 1314 1280 0.40 58.26 0.74 0.85
10 A' 1229 1197 2.08 21.76 0.53 0.69
11 A' 1117 1088 2.85 1.61 0.68 0.81
12 A' 1017 991 5.34 5.02 0.24 0.39
13 A' 939 914 1.97 9.87 0.75 0.85
14 A' 803 782 0.51 31.09 0.69 0.82
15 A' 342 333 0.47 0.19 0.75 0.85
16 A" 3064 2984 0.54 120.19 0.75 0.86
17 A" 3054 2975 0.27 77.88 0.75 0.86
18 A" 1380 1344 0.66 53.05 0.75 0.86
19 A" 1018 992 15.15 3.28 0.75 0.86
20 A" 987 961 16.00 34.30 0.75 0.86
21 A" 877 854 2.30 32.99 0.75 0.86
22 A" 809 788 32.46 0.48 0.75 0.86
23 A" 354 345 11.88 8.47 0.75 0.86
24 A" 69 67 0.20 0.30 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 18642.7 cm-1
Scaled (by 0.974) Zero Point Vibrational Energy (zpe) 18158.0 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 PM3
ABC
0.70231 0.21554 0.17598

See section I.F.4 to change rotational constant units
Geometric Data calculated at PM3

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.184 0.000
C2 -0.144 -1.293 0.000
C3 1.117 -0.510 0.000
C4 -0.719 1.438 0.000
H5 -0.478 -1.830 0.897
H6 -0.478 -1.830 -0.897
H7 2.188 -0.574 0.000
H8 -0.034 2.295 0.000
H9 -1.362 1.511 -0.888
H10 -1.362 1.511 0.888

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10
C11.48431.31521.44542.25602.25602.31562.11142.09862.0986
C21.48431.48452.79111.09751.09752.44063.59013.18383.1838
C31.31521.48452.67702.25642.25641.07283.03243.31953.3195
C41.44542.79112.67703.39743.39743.53521.09711.09841.0984
H52.25601.09752.25643.39741.79453.08074.24483.88993.4562
H62.25601.09752.25643.39741.79453.08074.24483.45623.8899
H72.31562.44061.07283.53523.08073.08073.62914.21164.2116
H82.11143.59013.03241.09714.24484.24483.62911.77891.7789
H92.09863.18383.31951.09843.88993.45624.21161.77891.7752
H102.09863.18383.31951.09843.45623.88994.21161.77891.7752

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 52.593 H1 C2 C6 121.079
C2 C3 C6 24.616 C2 C3 C10 71.750
C2 C6 C3 34.293 C2 C6 H4 48.342
C2 C6 H5 35.163 C3 C2 C6 121.091
C3 C6 H4 51.865 C3 C6 H5 66.569
C3 C10 H7 9.143 C3 C10 H8 65.017
C3 C10 H9 74.491 H4 C6 H5 74.687
C6 C3 C10 86.252 H7 C10 H8 58.936
H7 C10 H9 77.833 H8 C10 H9 60.069
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability