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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: MP4=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 MP4=FULL/3-21G
 hartrees
Energy at 0K-155.644513
Energy at 298.15K-155.653114
HF Energy-155.220788
Nuclear repulsion energy122.710108
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 MP4=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' 3237 3169        
2 A' 3161 3094        
3 A' 3144 3078        
4 A' 3080 3015        
5 A' 3017 2953        
6 A' 1579 1546        
7 A' 1548 1516        
8 A' 1478 1446        
9 A' 1412 1382        
10 A' 1246 1220        
11 A' 1173 1149        
12 A' 1116 1093        
13 A' 997 976        
14 A' 936 916        
15 A' 809 792        
16 A' 745 729        
17 A' 369 361        
18 A" 3221 3153        
19 A" 3138 3071        
20 A" 3084 3019        
21 A" 1573 1539        
22 A" 1532 1499        
23 A" 1222 1196        
24 A" 1198 1173        
25 A" 1149 1125        
26 A" 1127 1103        
27 A" 865 846        
28 A" 820 802        
29 A" 349 342        
30 A" 217 212        

Unscaled Zero Point Vibrational Energy (zpe) 24270.2 cm-1
Scaled (by 0.9788) Zero Point Vibrational Energy (zpe) 23755.7 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 MP4=FULL/3-21G
ABC
0.50259 0.20750 0.18193

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.358 0.423 0.000
C2 -0.908 1.280 0.000
H3 1.295 0.977 0.000
C4 0.358 -0.906 0.772
C5 0.358 -0.906 -0.772
H6 1.271 -1.209 1.279
H7 1.271 -1.209 -1.279
H8 -0.564 -1.187 1.277
H9 -0.564 -1.187 -1.277
H10 -1.800 0.633 0.000
H11 -0.949 1.921 0.893
H12 -0.949 1.921 -0.893

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.52871.08931.53701.53702.26502.26502.25212.25212.16762.17872.1787
C21.52872.22442.64132.64133.54613.54612.79872.79871.10111.10021.1002
H31.08932.22442.24122.24122.53252.53253.12603.12603.11412.59272.5927
C41.53702.64132.24121.54321.08732.26461.08812.26412.76033.11643.5312
C51.53702.64132.24121.54322.26461.08732.26411.08812.76033.53123.1164
H62.26503.54612.53251.08732.26462.55711.83503.14643.80193.85554.4084
H72.26503.54612.53252.26461.08732.55713.14641.83503.80194.40843.8555
H82.25212.79873.12601.08812.26411.83503.14642.55462.54363.15443.8098
H92.25212.79873.12602.26411.08813.14641.83502.55462.54363.80983.1544
H102.16761.10113.11412.76032.76033.80193.80192.54362.54361.78341.7834
H112.17871.10022.59273.11643.53123.85554.40843.15443.80981.78341.7867
H122.17871.10022.59273.53123.11644.40843.85553.80983.15441.78341.7867

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 109.961 C1 C2 H11 110.891
C1 C2 H12 110.891 C1 C4 H5 59.867
C1 C4 H6 118.323 C1 C4 H8 117.145
C1 H5 C4 59.867 C1 H5 H7 118.323
C1 H5 H9 117.145 C2 C1 C3 115.324
C2 C1 C4 118.987 C2 C1 H5 118.987
C3 C1 C4 116.118 C3 C1 H5 116.118
C4 C1 H5 60.267 C4 H5 H7 117.792
C4 H5 H9 117.696 H5 C4 H6 117.792
H5 C4 H8 117.696 H6 C4 H8 115.029
H7 H5 H9 115.029 H10 C2 H11 108.218
H10 C2 H12 108.218 H11 C2 H12 108.575
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability