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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-156.617555
Energy at 298.15K-156.626229
HF Energy-156.095367
Nuclear repulsion energy124.352321
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' 3299 3111 18.95      
2 A' 3214 3031 16.19      
3 A' 3205 3022 11.10      
4 A' 3180 2999 15.23      
5 A' 3095 2918 25.76      
6 A' 1576 1487 0.62      
7 A' 1565 1476 7.73      
8 A' 1483 1398 3.47      
9 A' 1447 1364 1.85      
10 A' 1280 1207 0.14      
11 A' 1253 1181 0.08      
12 A' 1106 1043 9.04      
13 A' 1042 982 9.51      
14 A' 974 918 3.27      
15 A' 828 780 4.87      
16 A' 800 755 1.99      
17 A' 373 352 0.20      
18 A" 3287 3100 0.21      
19 A" 3200 3018 15.99      
20 A" 3183 3001 24.16      
21 A" 1556 1468 1.88      
22 A" 1526 1439 1.97      
23 A" 1237 1167 0.59      
24 A" 1192 1124 0.07      
25 A" 1151 1085 4.59      
26 A" 1106 1043 1.88      
27 A" 914 862 6.95      
28 A" 853 804 5.03      
29 A" 350 330 0.76      
30 A" 233 219 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24752.7 cm-1
Scaled (by 0.943) Zero Point Vibrational Energy (zpe) 23341.8 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
0.52184 0.21229 0.18649

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 0.347 0.404 0.000
C2 -0.882 1.278 0.000
H3 1.291 0.945 0.000
C4 0.347 -0.897 0.753
C5 0.347 -0.897 -0.753
H6 1.253 -1.201 1.268
H7 1.253 -1.201 -1.268
H8 -0.570 -1.184 1.259
H9 -0.570 -1.184 -1.259
H10 -1.787 0.661 0.000
H11 -0.913 1.919 0.887
H12 -0.913 1.919 -0.887

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.50821.08801.50351.50352.23692.23692.22442.22442.14972.16112.1611
C21.50822.19852.60932.60933.50853.50852.78242.78241.09491.09481.0948
H31.08802.19852.20282.20282.49292.49293.09543.09543.09112.56792.5679
C41.50352.60932.20281.50691.08512.23561.08602.23042.74793.08823.4942
C51.50352.60932.20281.50692.23561.08512.23041.08602.74793.49423.0882
H62.23693.50852.49291.08512.23562.53541.82313.11603.78383.81754.3668
H72.23693.50852.49292.23561.08512.53543.11601.82313.78384.36683.8175
H82.22442.78243.09541.08602.23041.82313.11602.51872.54393.14383.7882
H92.22442.78243.09542.23041.08603.11601.82312.51872.54393.78823.1438
H102.14971.09493.09112.74792.74793.78383.78382.54392.54391.76951.7695
H112.16111.09482.56793.08823.49423.81754.36683.14383.78821.76951.7734
H122.16111.09482.56793.49423.08824.36683.81753.78823.14381.76951.7734

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.338 C1 C2 H11 111.262
C1 C2 H12 111.262 C1 C4 H5 59.925
C1 C4 H6 118.677 C1 C4 H8 117.510
C1 H5 C4 59.925 C1 H5 H7 118.677
C1 H5 H9 117.510 C2 C1 C3 114.772
C2 C1 C4 120.085 C2 C1 H5 120.085
C3 C1 C4 115.495 C3 C1 H5 115.495
C4 C1 H5 60.149 C4 H5 H7 118.290
C4 H5 H9 117.765 H5 C4 H6 118.290
H5 C4 H8 117.765 H6 C4 H8 114.227
H7 H5 H9 114.227 H10 C2 H11 107.830
H10 C2 H12 107.830 H11 C2 H12 108.181
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability