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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-155.600950
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 3124 16.90      
2 A' 3217 3050 10.34      
3 A' 3199 3033 7.08      
4 A' 3141 2978 19.98      
5 A' 3073 2913 21.81      
6 A' 1604 1521 6.53      
7 A' 1574 1492 2.16      
8 A' 1498 1420 4.15      
9 A' 1437 1362 1.26      
10 A' 1265 1200 0.16      
11 A' 1204 1142 0.09      
12 A' 1136 1077 21.12      
13 A' 1017 964 0.06      
14 A' 958 909 6.93      
15 A' 827 784 0.67      
16 A' 763 724 6.87      
17 A' 376 357 0.17      
18 A" 3279 3109 0.15      
19 A" 3193 3027 13.16      
20 A" 3145 2981 24.50      
21 A" 1596 1513 1.77      
22 A" 1558 1477 2.95      
23 A" 1243 1178 0.54      
24 A" 1220 1157 0.32      
25 A" 1170 1109 7.79      
26 A" 1146 1086 0.88      
27 A" 881 835 1.22      
28 A" 842 798 11.90      
29 A" 356 337 1.11      
30 A" 227 215 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24720.7 cm-1
Scaled (by 0.948) Zero Point Vibrational Energy (zpe) 23435.3 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=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