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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: QCISD/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 QCISD/6-31G*
 hartrees
Energy at 0K-156.664450
Energy at 298.15K-156.673099
HF Energy-156.094963
Nuclear repulsion energy124.005642
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 QCISD/6-31G*
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' 3250 3095 28.69      
2 A' 3173 3021 10.88      
3 A' 3166 3015 21.96      
4 A' 3126 2977 21.06      
5 A' 3055 2909 29.39      
6 A' 1571 1496 0.94      
7 A' 1551 1477 6.70      
8 A' 1480 1409 3.14      
9 A' 1441 1372 1.91      
10 A' 1270 1210 0.12      
11 A' 1246 1186 0.07      
12 A' 1108 1056 6.66      
13 A' 1032 982 8.67      
14 A' 968 921 3.04      
15 A' 821 781 4.38      
16 A' 795 757 2.60      
17 A' 373 355 0.19      
18 A" 3237 3083 0.27      
19 A" 3160 3009 22.12      
20 A" 3128 2979 30.82      
21 A" 1543 1469 1.64      
22 A" 1516 1444 1.65      
23 A" 1233 1174 0.46      
24 A" 1190 1133 0.23      
25 A" 1143 1089 4.11      
26 A" 1112 1059 1.33      
27 A" 907 863 7.31      
28 A" 849 809 4.79      
29 A" 349 332 0.63      
30 A" 226 215 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24508.0 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 23339.0 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 QCISD/6-31G*
ABC
0.51954 0.21093 0.18526

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.347 0.403 0.000
C2 -0.883 1.284 0.000
H3 1.293 0.947 0.000
C4 0.347 -0.900 0.755
C5 0.347 -0.900 -0.755
H6 1.255 -1.205 1.272
H7 1.255 -1.205 -1.272
H8 -0.571 -1.190 1.264
H9 -0.571 -1.190 -1.264
H10 -1.794 0.671 0.000
H11 -0.911 1.928 0.889
H12 -0.911 1.928 -0.889

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51261.09071.50681.50682.24262.24262.23152.23152.15842.16722.1672
C21.51262.20192.61802.61803.51893.51892.79542.79541.09821.09801.0980
H31.09072.20192.20832.20832.49992.49993.10443.10443.09982.57122.5712
C41.50682.61802.20831.51031.08792.24171.08882.23682.76183.09823.5049
C51.50682.61802.20831.51032.24171.08792.23681.08882.76183.50493.0982
H62.24263.51892.49991.08792.24172.54351.82583.12463.79973.82794.3790
H72.24263.51892.49992.24171.08792.54353.12461.82583.79974.37903.8279
H82.23152.79543.10441.08882.23681.82583.12462.52782.56113.15853.8040
H92.23152.79543.10442.23681.08883.12461.82582.52782.56113.80403.1585
H102.15841.09823.09982.76182.76183.79973.79972.56112.56111.77441.7744
H112.16721.09802.57123.09823.50493.82794.37903.15853.80401.77441.7780
H122.16721.09802.57123.50493.09824.37903.82793.80403.15851.77441.7780

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.520 C1 C2 H11 111.236
C1 C2 H12 111.236 C1 C4 H5 59.923
C1 C4 H6 118.715 C1 C4 H8 117.668
C1 H5 C4 59.923 C1 H5 H7 118.715
C1 H5 H9 117.668 C2 C1 C3 114.545
C2 C1 C4 120.237 C2 C1 H5 120.237
C3 C1 C4 115.528 C3 C1 H5 115.528
C4 C1 H5 60.154 C4 H5 H7 118.348
C4 H5 H9 117.854 H5 C4 H6 118.348
H5 C4 H8 117.854 H6 C4 H8 114.019
H7 H5 H9 114.019 H10 C2 H11 107.791
H10 C2 H12 107.791 H11 C2 H12 108.124
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability