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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: CISD/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 CISD/3-21G*
 hartrees
Energy at 0K-155.581330
Energy at 298.15K-155.590043
HF Energy-155.222448
Nuclear repulsion energy123.527334
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 CISD/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' 3312 3095 19.57      
2 A' 3240 3028 9.54      
3 A' 3224 3012 9.41      
4 A' 3156 2949 21.85      
5 A' 3097 2893 24.51      
6 A' 1614 1508 6.94      
7 A' 1589 1485 2.46      
8 A' 1517 1418 4.51      
9 A' 1456 1361 0.93      
10 A' 1283 1199 0.15      
11 A' 1220 1140 0.13      
12 A' 1155 1079 18.26      
13 A' 1028 960 0.09      
14 A' 973 909 9.01      
15 A' 835 780 0.74      
16 A' 778 727 7.83      
17 A' 381 356 0.15      
18 A" 3296 3080 0.16      
19 A" 3215 3004 15.68      
20 A" 3158 2951 27.42      
21 A" 1606 1501 1.89      
22 A" 1568 1465 3.55      
23 A" 1260 1177 0.40      
24 A" 1235 1154 0.84      
25 A" 1183 1105 8.28      
26 A" 1170 1093 0.00      
27 A" 895 837 0.21      
28 A" 860 804 14.39      
29 A" 361 338 1.09      
30 A" 223 209 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24944.5 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 23308.1 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 CISD/3-21G*
ABC
0.51066 0.20989 0.18415

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.355 0.417 0.000
C2 -0.902 1.274 0.000
H3 1.287 0.968 0.000
C4 0.355 -0.901 0.765
C5 0.355 -0.901 -0.765
H6 1.262 -1.201 1.270
H7 1.262 -1.201 -1.270
H8 -0.560 -1.183 1.268
H9 -0.560 -1.183 -1.268
H10 -1.793 0.639 0.000
H11 -0.938 1.913 0.888
H12 -0.938 1.913 -0.888

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.52181.08281.52361.52362.24842.24842.23682.23682.15972.16752.1675
C21.52182.21032.62622.62623.52523.52522.78582.78581.09451.09391.0939
H31.08282.21032.22422.22422.51432.51433.10583.10583.09772.57502.5750
C41.52362.62622.22421.52961.08112.24841.08182.24692.75163.09903.5099
C51.52362.62622.22421.52962.24841.08112.24691.08182.75163.50993.0990
H62.24843.52522.51431.08112.24842.54091.82273.12483.78633.83214.3813
H72.24843.52522.51432.24841.08112.54093.12481.82273.78634.38133.8321
H82.23682.78583.10581.08182.24691.82273.12482.53532.53873.14133.7906
H92.23682.78583.10582.24691.08183.12481.82272.53532.53873.79063.1413
H102.15971.09453.09772.75162.75163.78633.78632.53872.53871.77241.7724
H112.16751.09392.57503.09903.50993.83214.38133.14133.79061.77241.7754
H122.16751.09392.57503.50993.09904.38133.83213.79063.14131.77241.7754

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.209 C1 C2 H11 110.859
C1 C2 H12 110.859 C1 C4 H5 59.868
C1 C4 H6 118.368 C1 C4 H8 117.293
C1 H5 C4 59.868 C1 H5 H7 118.368
C1 H5 H9 117.293 C2 C1 C3 115.081
C2 C1 C4 119.171 C2 C1 H5 119.171
C3 C1 C4 116.133 C3 C1 H5 116.133
C4 C1 H5 60.263 C4 H5 H7 117.885
C4 H5 H9 117.699 H5 C4 H6 117.885
H5 C4 H8 117.699 H6 C4 H8 114.853
H7 H5 H9 114.853 H10 C2 H11 108.172
H10 C2 H12 108.172 H11 C2 H12 108.478
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability