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All results from a given calculation for C4H8 (methylcyclopropane)

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 CS 1A'
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-156.765334
Energy at 298.15K-156.773967
HF Energy-156.116324
Nuclear repulsion energy124.543468
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' 3309 3126 10.32      
2 A' 3224 3045 12.35      
3 A' 3208 3030 6.47      
4 A' 3185 3009 11.85      
5 A' 3095 2923 21.62      
6 A' 1536 1451 1.53      
7 A' 1527 1442 6.61      
8 A' 1446 1366 3.34      
9 A' 1409 1331 2.26      
10 A' 1255 1185 0.17      
11 A' 1228 1160 0.10      
12 A' 1069 1009 5.84      
13 A' 1027 970 9.96      
14 A' 953 900 2.57      
15 A' 817 771 5.19      
16 A' 784 740 0.54      
17 A' 361 341 0.20      
18 A" 3297 3114 0.11      
19 A" 3203 3025 11.51      
20 A" 3185 3008 16.91      
21 A" 1523 1438 1.87      
22 A" 1485 1402 1.66      
23 A" 1210 1143 0.46      
24 A" 1160 1096 0.03      
25 A" 1128 1065 4.33      
26 A" 1080 1020 1.42      
27 A" 906 856 6.43      
28 A" 827 781 4.17      
29 A" 344 325 0.62      
30 A" 236 223 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24506.4 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 23146.3 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
0.52125 0.21341 0.18758

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 0.351 0.409 0.000
C2 -0.889 1.266 0.000
H3 1.290 0.950 0.000
C4 0.351 -0.892 0.754
C5 0.351 -0.892 -0.754
H6 1.256 -1.195 1.262
H7 1.256 -1.195 -1.262
H8 -0.566 -1.176 1.255
H9 -0.566 -1.176 -1.255
H10 -1.783 0.639 0.000
H11 -0.931 1.906 0.884
H12 -0.931 1.906 -0.884

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.50661.08401.50431.50432.23292.23292.21982.21982.14632.15972.1597
C21.50662.20142.60052.60053.49983.49982.76422.76421.09241.09221.0922
H31.08402.20142.20142.20142.48912.48913.08873.08873.08912.57452.5745
C41.50432.60052.20141.50841.08132.23071.08242.22632.73283.08063.4866
C51.50432.60052.20141.50842.23071.08132.22631.08242.73283.48663.0806
H62.23293.49982.48911.08132.23072.52381.82253.10713.76763.81354.3594
H72.23293.49982.48912.23071.08132.52383.10711.82253.76764.35943.8135
H82.21982.76423.08871.08242.22631.82253.10712.50912.51993.12563.7689
H92.21982.76423.08872.22631.08243.10711.82252.50912.51993.76893.1256
H102.14631.09243.08912.73282.73283.76763.76762.51992.51991.76431.7643
H112.15971.09222.57453.08063.48663.81354.35943.12563.76891.76431.7678
H122.15971.09222.57453.48663.08064.35943.81353.76893.12561.76431.7678

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.334 C1 C2 H11 111.420
C1 C2 H12 111.420 C1 C4 H5 59.909
C1 C4 H6 118.529 C1 C4 H8 117.295
C1 H5 C4 59.909 C1 H5 H7 118.529
C1 H5 H9 117.295 C2 C1 C3 115.412
C2 C1 C4 119.471 C2 C1 H5 119.471
C3 C1 C4 115.580 C3 C1 H5 115.580
C4 C1 H5 60.181 C4 H5 H7 118.002
C4 H5 H9 117.535 H5 C4 H6 118.002
H5 C4 H8 117.535 H6 C4 H8 114.767
H7 H5 H9 114.767 H10 C2 H11 107.727
H10 C2 H12 107.727 H11 C2 H12 108.056
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability