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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: MP2/6-31G**

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**
 hartrees
Energy at 0K-156.682391
Energy at 298.15K-156.691083
HF Energy-156.108936
Nuclear repulsion energy124.601746
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**
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' 3332 3120 20.02      
2 A' 3243 3037 17.26      
3 A' 3231 3026 11.87      
4 A' 3209 3005 15.90      
5 A' 3117 2919 27.60      
6 A' 1577 1477 0.59      
7 A' 1562 1462 5.91      
8 A' 1480 1386 2.58      
9 A' 1441 1350 2.88      
10 A' 1278 1196 0.21      
11 A' 1251 1172 0.12      
12 A' 1109 1039 7.00      
13 A' 1042 975 8.64      
14 A' 972 911 2.33      
15 A' 826 774 4.67      
16 A' 800 749 1.65      
17 A' 370 347 0.22      
18 A" 3320 3109 0.19      
19 A" 3226 3021 17.16      
20 A" 3210 3007 25.68      
21 A" 1552 1454 1.31      
22 A" 1526 1429 0.94      
23 A" 1239 1160 0.50      
24 A" 1194 1118 0.01      
25 A" 1150 1077 3.81      
26 A" 1110 1039 1.31      
27 A" 915 857 7.10      
28 A" 850 796 4.28      
29 A" 349 327 0.61      
30 A" 237 222 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24857.9 cm-1
Scaled (by 0.9365) Zero Point Vibrational Energy (zpe) 23279.5 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**
ABC
0.52361 0.21303 0.18716

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.348 0.405 0.000
C2 -0.883 1.274 0.000
H3 1.287 0.944 0.000
C4 0.348 -0.895 0.753
C5 0.348 -0.895 -0.753
H6 1.251 -1.197 1.264
H7 1.251 -1.197 -1.264
H8 -0.567 -1.180 1.255
H9 -0.567 -1.180 -1.255
H10 -1.781 0.656 0.000
H11 -0.917 1.913 0.883
H12 -0.917 1.913 -0.883

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.50661.08351.50241.50242.23132.23132.21852.21852.14362.15692.1569
C21.50662.19512.60542.60543.50103.50102.77412.77411.09061.09041.0904
H31.08352.19512.19862.19862.48682.48683.08613.08613.08212.56422.5642
C41.50242.60542.19861.50571.08042.22991.08142.22462.73973.08223.4871
C51.50242.60542.19861.50572.22991.08042.22461.08142.73973.48713.0822
H62.23133.50102.48681.08042.22992.52701.81773.10593.77143.80974.3564
H72.23133.50102.48682.22991.08042.52703.10591.81773.77144.35643.8097
H82.21852.77413.08611.08142.22461.81773.10592.51002.53353.13403.7757
H92.21852.77413.08612.22461.08143.10591.81772.51002.53353.77573.1340
H102.14361.09063.08212.73972.73973.77143.77142.53352.53351.76261.7626
H112.15691.09042.56423.08223.48713.80974.35643.13403.77571.76261.7666
H122.15691.09042.56423.48713.08224.35643.80973.77573.13401.76261.7666

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.224 C1 C2 H11 111.297
C1 C2 H12 111.297 C1 C4 H5 59.927
C1 C4 H6 118.607 C1 C4 H8 117.392
C1 H5 C4 59.927 C1 H5 H7 118.607
C1 H5 H9 117.392 C2 C1 C3 114.898
C2 C1 C4 119.962 C2 C1 H5 119.962
C3 C1 C4 115.518 C3 C1 H5 115.518
C4 C1 H5 60.145 C4 H5 H7 118.207
C4 H5 H9 117.666 H5 C4 H6 118.207
H5 C4 H8 117.666 H6 C4 H8 114.450
H7 H5 H9 114.450 H10 C2 H11 107.839
H10 C2 H12 107.839 H11 C2 H12 108.207
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability