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All results from a given calculation for C4H6 (1-Methylcyclopropene)

using model chemistry: CID/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at CID/3-21G*
 hartrees
Energy at 0K-154.338039
Energy at 298.15K 
HF Energy-153.989197
Nuclear repulsion energy107.423860
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 CID/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' 3378 3143 0.21      
2 A' 3180 2959 13.04      
3 A' 3171 2950 38.43      
4 A' 3106 2891 16.92      
5 A' 1880 1749 8.77      
6 A' 1617 1504 4.38      
7 A' 1601 1490 8.45      
8 A' 1514 1409 1.18      
9 A' 1231 1145 6.25      
10 A' 1162 1081 4.90      
11 A' 1132 1054 50.47      
12 A' 1002 932 0.73      
13 A' 954 887 7.58      
14 A' 650 605 0.17      
15 A' 338 314 1.75      
16 A" 3248 3022 39.99      
17 A" 3160 2940 13.08      
18 A" 1596 1486 7.97      
19 A" 1171 1090 0.24      
20 A" 1118 1040 2.96      
21 A" 1055 981 2.17      
22 A" 790 735 42.86      
23 A" 314 292 14.62      
24 A" 138 129 0.35      

Unscaled Zero Point Vibrational Energy (zpe) 19251.6 cm-1
Scaled (by 0.9305) Zero Point Vibrational Energy (zpe) 17913.6 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 CID/3-21G*
ABC
0.67571 0.20889 0.17007

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.177 0.000
C2 -0.089 -1.359 0.000
C3 1.145 -0.436 0.000
C4 -0.798 1.431 0.000
H5 -0.366 -1.871 0.915
H6 -0.366 -1.871 -0.915
H7 2.214 -0.392 0.000
H8 -0.143 2.305 0.000
H9 -1.441 1.471 -0.884
H10 -1.441 1.471 0.884

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10
C11.53861.29851.48622.27272.27272.28572.13242.12912.1291
C21.53861.54102.87841.08421.08422.49773.66403.25853.2585
C31.29851.54102.69432.27562.27561.06993.02793.33243.3324
C41.48622.87842.69433.45323.45323.52061.09241.09411.0941
H52.27271.08422.27563.45321.82973.11104.28043.94463.5106
H62.27271.08422.27563.45321.82973.11104.28043.51063.9446
H72.28572.49771.06993.52063.11103.11103.58124.19664.1966
H82.13243.66403.02791.09244.28044.28043.58121.77861.7786
H92.12913.25853.33241.09413.94463.51064.19661.77861.7685
H102.12913.25853.33241.09413.51063.94464.19661.77861.7685

picture of 1-Methylcyclopropene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 C2 C3 49.876 H1 C2 C6 119.087
C2 C3 C6 24.588 C2 C3 C10 73.819
C2 C6 C3 36.256 C2 C6 H4 49.984
C2 C6 H5 32.459 C3 C2 C6 119.155
C3 C6 H4 51.220 C3 C6 H5 66.295
C3 C10 H7 9.675 C3 C10 H8 64.515
C3 C10 H9 74.613 H4 C6 H5 74.637
C6 C3 C10 87.266 H7 C10 H8 57.823
H7 C10 H9 77.836 H8 C10 H9 60.189
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability