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

using model chemistry: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-155.513310
Energy at 298.15K 
HF Energy-154.887552
Nuclear repulsion energy108.244548
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 MP2/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3352 3166 0.80 102.65 0.29 0.45
2 A' 3203 3026 8.17 68.34 0.74 0.85
3 A' 3120 2947 49.85 111.01 0.13 0.23
4 A' 3099 2927 14.67 141.90 0.01 0.02
5 A' 1850 1748 8.48 24.13 0.18 0.30
6 A' 1545 1459 6.56 13.34 0.41 0.58
7 A' 1511 1427 8.02 17.51 0.69 0.82
8 A' 1421 1342 0.08 9.05 0.62 0.76
9 A' 1218 1150 1.96 4.51 0.33 0.50
10 A' 1103 1041 7.54 2.15 0.18 0.30
11 A' 1077 1018 28.28 0.21 0.21 0.34
12 A' 998 942 4.96 8.52 0.37 0.54
13 A' 963 910 12.26 7.53 0.56 0.72
14 A' 694 655 0.22 14.25 0.56 0.71
15 A' 324 306 1.60 1.39 0.73 0.85
16 A" 3199 3022 33.01 72.69 0.75 0.86
17 A" 3180 3004 7.72 69.90 0.75 0.86
18 A" 1507 1423 7.05 13.48 0.75 0.86
19 A" 1135 1072 0.87 1.98 0.75 0.86
20 A" 1059 1000 0.57 3.28 0.75 0.86
21 A" 1008 952 2.83 8.20 0.75 0.86
22 A" 749 708 24.71 0.78 0.75 0.86
23 A" 300 284 9.27 0.79 0.75 0.86
24 A" 163 154 0.36 0.28 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 18888.9 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 17840.6 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 MP2/6-31G(2df,p)
ABC
0.69137 0.21202 0.17304

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.181 0.000
C2 -0.048 -1.327 0.000
C3 1.155 -0.418 0.000
C4 -0.838 1.393 0.000
H5 -0.321 -1.853 0.913
H6 -0.321 -1.853 -0.913
H7 2.229 -0.378 0.000
H8 -0.229 2.298 0.000
H9 -1.487 1.406 -0.879
H10 -1.487 1.406 0.879

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10
C11.50821.30121.47412.25262.25262.29762.12962.11802.1180
C21.50821.50822.83261.08901.08902.46673.62923.21153.2115
C31.30121.50822.69342.25262.25261.07413.04813.32903.3290
C41.47412.83262.69343.41223.41223.54141.09051.09251.0925
H52.25261.08902.25263.41221.82673.08424.25153.89843.4623
H62.25261.08902.25263.41221.82673.08424.25153.46233.8984
H72.29762.46671.07413.54143.08423.08423.63294.21454.2145
H82.12963.62923.04811.09054.25154.25153.63291.77481.7748
H92.11803.21153.32901.09253.89843.46234.21451.77481.7573
H102.11803.21153.32901.09253.46233.89844.21451.77481.7573

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 51.109 H1 C2 C6 119.423
C2 C3 C6 24.901 C2 C3 C10 72.356
C2 C6 C3 35.672 C2 C6 H4 49.714
C2 C6 H5 32.994 C3 C2 C6 119.427
C3 C6 H4 52.006 C3 C6 H5 66.080
C3 C10 H7 9.309 C3 C10 H8 65.281
C3 C10 H9 74.696 H4 C6 H5 74.474
C6 C3 C10 86.333 H7 C10 H8 58.959
H7 C10 H9 77.966 H8 C10 H9 60.324
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability