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

using model chemistry: MP2/CEP-121G*

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-121G*
 hartrees
Energy at 0K-32.689647
Energy at 298.15K-32.696635
HF Energy-32.044643
Nuclear repulsion energy84.749620
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-121G*
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 3178 3028 24.39      
2 A1 3156 3007 8.35      
3 A1 3052 2908 54.21      
4 A1 2010 1915 11.32      
5 A1 1542 1469 0.25      
6 A1 1495 1424 2.20      
7 A1 1447 1378 0.58      
8 A1 1319 1257 12.96      
9 A1 1038 989 5.31      
10 A1 734 699 0.00      
11 A1 337 321 0.07      
12 A2 3131 2983 0.00      
13 A2 1508 1436 0.00      
14 A2 1016 968 0.00      
15 A2 622 593 0.00      
16 A2 141 134 0.00      
17 B1 3248 3095 5.56      
18 B1 3131 2984 51.64      
19 B1 1525 1453 18.11      
20 B1 1112 1060 0.43      
21 B1 1033 985 0.34      
22 B1 432 412 0.26      
23 B1 269 257 7.24      
24 B1 153 146 1.42      
25 B2 3178 3028 16.48      
26 B2 3050 2906 23.57      
27 B2 1520 1448 7.45      
28 B2 1430 1363 5.74      
29 B2 1244 1185 4.41      
30 B2 984 938 0.18      
31 B2 845 805 62.93      
32 B2 597 569 10.55      
33 B2 181 173 0.63      

Unscaled Zero Point Vibrational Energy (zpe) 24829.3 cm-1
Scaled (by 0.9528) Zero Point Vibrational Energy (zpe) 23657.4 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-121G*
ABC
0.27207 0.11842 0.08667

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 2.296
C2 0.000 0.000 0.971
H3 -0.931 0.000 2.860
H4 0.931 0.000 2.860
C5 0.000 0.000 -0.354
C6 0.000 1.296 -1.150
C7 0.000 -1.296 -1.150
H8 0.000 2.167 -0.490
H9 0.000 -2.167 -0.490
H10 0.885 1.343 -1.797
H11 -0.885 1.343 -1.797
H12 -0.885 -1.343 -1.797
H13 0.885 -1.343 -1.797

Atom - Atom Distances (Å)
  C1 C2 H3 H4 C5 C6 C7 H8 H9 H10 H11 H12 H13
C11.32521.08851.08852.65003.68153.68153.52903.52904.39784.39784.39784.3978
C21.32522.10642.10641.32482.48542.48542.61302.61303.20133.20133.20133.2013
H31.08852.10641.86143.34654.31614.31614.09674.09675.17634.84764.84765.1763
H41.08852.10641.86143.34654.31614.31614.09674.09674.84765.17635.17634.8476
C52.65001.32483.34653.34651.52101.52102.17132.17132.16092.16092.16092.1609
C63.68152.48544.31614.31611.52102.59241.09303.52571.09761.09762.85782.8578
C73.68152.48544.31614.31611.52102.59243.52571.09302.85782.85781.09761.0976
H83.52902.61304.09674.09672.17131.09303.52574.33411.78141.78143.84883.8488
H93.52902.61304.09674.09672.17133.52571.09304.33413.84883.84881.78141.7814
H104.39783.20135.17634.84762.16091.09762.85781.78143.84881.77023.21662.6857
H114.39783.20134.84765.17632.16091.09762.85781.78143.84881.77022.68573.2166
H124.39783.20134.84765.17632.16092.85781.09763.84881.78143.21662.68571.7702
H134.39783.20135.17634.84762.16092.85781.09763.84881.78142.68573.21661.7702

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 121.239
C2 C1 H4 121.239 C2 C5 C6 121.547
C2 C5 C7 121.547 H3 C1 H4 117.522
C5 C6 H8 111.274 C5 C6 H10 110.172
C5 C6 H11 110.172 C5 C7 H9 111.274
C5 C7 H12 110.172 C5 C7 H13 110.172
C6 C5 C7 116.905 H8 C6 H10 108.820
H8 C6 H11 108.820 H9 C7 H12 108.820
H9 C7 H13 108.820 H10 C6 H11 107.488
H12 C7 H13 107.488
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability