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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: QCISD(T)/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(T)/6-31G*
 hartrees
Energy at 0K-156.681487
Energy at 298.15K-156.690099
HF Energy-156.094634
Nuclear repulsion energy123.821677
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(T)/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' 3234 3103        
2 A' 3155 3027        
3 A' 3149 3020        
4 A' 3111 2984        
5 A' 3039 2915        
6 A' 1557 1494        
7 A' 1543 1480        
8 A' 1467 1408        
9 A' 1429 1371        
10 A' 1258 1207        
11 A' 1236 1186        
12 A' 1096 1052        
13 A' 1022 981        
14 A' 960 921        
15 A' 813 780        
16 A' 787 755        
17 A' 369 354        
18 A" 3221 3090        
19 A" 3143 3015        
20 A" 3114 2987        
21 A" 1536 1473        
22 A" 1507 1445        
23 A" 1223 1174        
24 A" 1179 1131        
25 A" 1135 1089        
26 A" 1097 1052        
27 A" 895 858        
28 A" 841 807        
29 A" 344 330        
30 A" 222 213        

Unscaled Zero Point Vibrational Energy (zpe) 24340.7 cm-1
Scaled (by 0.9593) Zero Point Vibrational Energy (zpe) 23350.1 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 QCISD(T)/6-31G*
ABC
0.51739 0.21046 0.18486

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.349 0.406 0.000
C2 -0.886 1.283 0.000
H3 1.295 0.950 0.000
C4 0.349 -0.901 0.757
C5 0.349 -0.901 -0.757
H6 1.258 -1.206 1.273
H7 1.258 -1.206 -1.273
H8 -0.571 -1.190 1.266
H9 -0.571 -1.190 -1.266
H10 -1.795 0.665 0.000
H11 -0.917 1.927 0.890
H12 -0.917 1.927 -0.890

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51441.09221.51021.51022.24652.24652.23492.23492.15872.17002.1700
C21.51442.20622.62072.62073.52333.52332.79622.79621.09961.09931.0993
H31.09222.20622.21292.21292.50472.50473.10923.10923.10312.57702.5770
C41.51022.62072.21291.51341.08932.24511.09022.24072.75993.10143.5091
C51.51022.62072.21291.51342.24511.08932.24071.09022.75993.50913.1014
H62.24653.52332.50471.08932.24512.54661.82903.12943.79983.83334.3851
H72.24653.52332.50472.24511.08932.54663.12941.82903.79984.38513.8333
H82.23492.79623.10921.09022.24071.82903.12942.53212.55713.15873.8061
H92.23492.79623.10922.24071.09023.12941.82902.53212.55713.80613.1587
H102.15871.09963.10312.75992.75993.79983.79982.55712.55711.77701.7770
H112.17001.09932.57703.10143.50913.83334.38513.15873.80611.77701.7808
H122.17001.09932.57703.50913.10144.38513.83333.80613.15871.77701.7808

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.339 C1 C2 H11 111.258
C1 C2 H12 111.258 C1 C4 H5 59.930
C1 C4 H6 118.688 C1 C4 H8 117.599
C1 H5 C4 59.930 C1 H5 H7 118.688
C1 H5 H9 117.599 C2 C1 C3 114.680
C2 C1 C4 120.100 C2 C1 H5 120.100
C3 C1 C4 115.560 C3 C1 H5 115.560
C4 C1 H5 60.140 C4 H5 H7 118.309
C4 H5 H9 117.852 H5 C4 H6 118.309
H5 C4 H8 117.852 H6 C4 H8 114.100
H7 H5 H9 114.100 H10 C2 H11 107.829
H10 C2 H12 107.829 H11 C2 H12 108.190
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability