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All results from a given calculation for C5H8 (1,2-Butadiene, 3-methyl-)

using model chemistry: MP2/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP2/CEP-31G*
 hartrees
Energy at 0K-32.618197
Energy at 298.15K-32.625087
HF Energy-32.016606
Nuclear repulsion energy83.865883
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/CEP-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 A1 3195 3034 25.59      
2 A1 3174 3013 9.71      
3 A1 3072 2917 53.97      
4 A1 2047 1943 8.34      
5 A1 1535 1457 0.07      
6 A1 1489 1414 3.18      
7 A1 1443 1370 0.34      
8 A1 1320 1253 18.03      
9 A1 1038 986 8.41      
10 A1 739 701 0.06      
11 A1 333 316 0.06      
12 A2 3158 2999 0.00      
13 A2 1501 1425 0.00      
14 A2 1024 972 0.00      
15 A2 610 579 0.00      
16 A2 164 156 0.00      
17 B1 3267 3102 8.07      
18 B1 3158 2998 59.17      
19 B1 1515 1439 20.55      
20 B1 1114 1058 0.15      
21 B1 1000 949 0.26      
22 B1 393 373 1.20      
23 B1 252 239 7.18      
24 B1 171 162 2.12      
25 B2 3194 3032 15.22      
26 B2 3073 2917 26.16      
27 B2 1507 1431 6.27      
28 B2 1429 1357 4.14      
29 B2 1258 1195 4.93      
30 B2 986 936 0.62      
31 B2 806 765 78.87      
32 B2 550 522 5.41      
33 B2 168 160 0.82      

Unscaled Zero Point Vibrational Energy (zpe) 24841.3 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 23584.3 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/CEP-31G*
ABC
0.26889 0.11504 0.08461

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 2.302
C2 0.000 0.000 0.948
H3 -0.941 0.000 2.866
H4 0.941 0.000 2.866
C5 0.000 0.000 -0.399
C6 0.000 1.303 -1.198
C7 0.000 -1.303 -1.198
H8 0.000 2.180 -0.531
H9 0.000 -2.180 -0.531
H10 0.892 1.349 -1.850
H11 -0.892 1.349 -1.850
H12 -0.892 -1.349 -1.850
H13 0.892 -1.349 -1.850

Atom - Atom Distances (Å)
  C1 C2 H3 H4 C5 C6 C7 H8 H9 H10 H11 H12 H13
C11.35361.09721.09722.70143.73463.73463.57513.57514.45634.45634.45634.4563
C21.35362.13602.13601.34782.51102.51102.63502.63503.23263.23263.23263.2326
H31.09722.13601.88253.39834.37014.37014.14494.14495.23694.90574.90575.2369
H41.09722.13601.88253.39834.37014.37014.14494.14494.90575.23695.23694.9057
C52.70141.34783.39833.39831.52851.52852.18442.18442.17292.17292.17292.1729
C63.73462.51104.37014.37011.52852.60701.10143.54701.10631.10632.87382.8738
C73.73462.51104.37014.37011.52852.60703.54701.10142.87382.87381.10631.1063
H83.57512.63504.14494.14492.18441.10143.54704.36071.79631.79633.87223.8722
H93.57512.63504.14494.14492.18443.54701.10144.36073.87223.87221.79631.7963
H104.45633.23265.23694.90572.17291.10632.87381.79633.87221.78433.23512.6985
H114.45633.23264.90575.23692.17291.10632.87381.79633.87221.78432.69853.2351
H124.45633.23264.90575.23692.17292.87381.10633.87221.79633.23512.69851.7843
H134.45633.23265.23694.90572.17292.87381.10633.87221.79632.69853.23511.7843

picture of 1,2-Butadiene, 3-methyl- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C5 180.000 C2 C1 H3 120.924
C2 C1 H4 120.924 C2 C5 C6 121.484
C2 C5 C7 121.484 H3 C1 H4 118.152
C5 C6 H8 111.279 C5 C6 H10 110.082
C5 C6 H11 110.082 C5 C7 H9 111.279
C5 C7 H12 110.082 C5 C7 H13 110.082
C6 C5 C7 117.031 H8 C6 H10 108.907
H8 C6 H11 108.907 H9 C7 H12 108.907
H9 C7 H13 108.907 H10 C6 H11 107.491
H12 C7 H13 107.491
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability