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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: MP2=FULL/3-21G

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=FULL/3-21G
 hartrees
Energy at 0K-155.592278
Energy at 298.15K-155.600961
HF Energy-155.221972
Nuclear repulsion energy123.256304
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=FULL/3-21G
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' 3295 3146 16.90      
2 A' 3217 3072 10.34      
3 A' 3199 3054 7.08      
4 A' 3141 2999 19.98      
5 A' 3073 2934 21.81      
6 A' 1604 1532 6.53      
7 A' 1574 1503 2.16      
8 A' 1498 1430 4.15      
9 A' 1437 1372 1.26      
10 A' 1265 1208 0.16      
11 A' 1204 1150 0.09      
12 A' 1136 1085 21.12      
13 A' 1017 971 0.06      
14 A' 958 915 6.93      
15 A' 827 790 0.67      
16 A' 763 729 6.87      
17 A' 376 359 0.17      
18 A" 3279 3131 0.15      
19 A" 3193 3049 13.16      
20 A" 3145 3003 24.50      
21 A" 1596 1524 1.77      
22 A" 1558 1488 2.95      
23 A" 1243 1187 0.54      
24 A" 1220 1165 0.32      
25 A" 1170 1117 7.79      
26 A" 1146 1094 0.88      
27 A" 881 841 1.22      
28 A" 842 804 11.90      
29 A" 356 340 1.11      
30 A" 227 217 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24720.7 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 23603.4 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=FULL/3-21G
ABC
0.50793 0.20915 0.18341

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.355 0.419 0.000
C2 -0.902 1.277 0.000
H3 1.290 0.970 0.000
C4 0.355 -0.903 0.767
C5 0.355 -0.903 -0.767
H6 1.264 -1.204 1.274
H7 1.264 -1.204 -1.274
H8 -0.563 -1.184 1.270
H9 -0.563 -1.184 -1.270
H10 -1.793 0.637 0.000
H11 -0.940 1.916 0.890
H12 -0.940 1.916 -0.890

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.52251.08521.52861.52862.25462.25462.24142.24142.15952.17022.1702
C21.52252.21392.63122.63123.53183.53182.78942.78941.09671.09601.0960
H31.08522.21392.22972.22972.52012.52013.11223.11223.10122.58052.5805
C41.52862.63122.22971.53491.08332.25471.08402.25232.75263.10453.5170
C51.52862.63122.22971.53492.25471.08332.25231.08402.75263.51703.1045
H62.25463.53182.52011.08332.25472.54761.82803.13223.78963.83924.3901
H72.25463.53182.52012.25471.08332.54763.13221.82803.78964.39013.8392
H82.24142.78943.11221.08402.25231.82803.13222.53942.53753.14503.7961
H92.24142.78943.11222.25231.08403.13221.82802.53942.53753.79613.1450
H102.15951.09673.10122.75262.75263.78963.78962.53752.53751.77611.7761
H112.17021.09602.58053.10453.51703.83924.39013.14503.79611.77611.7795
H122.17021.09602.58053.51703.10454.39013.83923.79613.14501.77611.7795

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.007 C1 C2 H11 110.898
C1 C2 H12 110.898 C1 C4 H5 59.864
C1 C4 H6 118.362 C1 C4 H8 117.151
C1 H5 C4 59.864 C1 H5 H7 118.362
C1 H5 H9 117.151 C2 C1 C3 115.173
C2 C1 C4 119.168 C2 C1 H5 119.168
C3 C1 C4 116.057 C3 C1 H5 116.057
C4 C1 H5 60.273 C4 H5 H7 117.867
C4 H5 H9 117.603 H5 C4 H6 117.867
H5 C4 H8 117.603 H6 C4 H8 115.013
H7 H5 H9 115.013 H10 C2 H11 108.197
H10 C2 H12 108.197 H11 C2 H12 108.556
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability