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

using model chemistry: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-193.327201
Energy at 298.15K-193.334840
HF Energy-192.877667
Nuclear repulsion energy159.189420
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 MP2/3-21G*
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' 3264 3105 14.76      
2 A' 3248 3090 13.78      
3 A' 3183 3028 3.61      
4 A' 3164 3010 8.81      
5 A' 3158 3004 11.84      
6 A' 3152 2999 12.13      
7 A' 3077 2927 11.81      
8 A' 1692 1609 0.92      
9 A' 1657 1577 7.44      
10 A' 1600 1522 7.90      
11 A' 1539 1464 0.41      
12 A' 1493 1420 4.47      
13 A' 1481 1409 3.75      
14 A' 1380 1313 0.11      
15 A' 1338 1273 1.57      
16 A' 1138 1082 5.99      
17 A' 1065 1013 0.56      
18 A' 968 921 0.28      
19 A' 767 729 0.23      
20 A' 551 524 0.35      
21 A' 437 416 0.63      
22 A' 287 273 0.46      
23 A" 3142 2989 16.44      
24 A" 1584 1507 6.93      
25 A" 1128 1073 0.70      
26 A" 1027 977 24.52      
27 A" 942 896 46.90      
28 A" 924 879 45.09      
29 A" 791 752 1.02      
30 A" 643 612 0.20      
31 A" 386 367 9.76      
32 A" 205 195 0.36      
33 A" 133 127 0.03      

Unscaled Zero Point Vibrational Energy (zpe) 25271.8 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 24041.1 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 MP2/3-21G*
ABC
0.28043 0.13705 0.09369

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.572 1.755 0.000
C2 0.000 0.532 0.000
C3 -0.847 -0.687 0.000
C4 -0.388 -1.955 0.000
C5 1.517 0.358 0.000
H6 -1.653 1.879 0.000
H7 0.021 2.666 0.000
H8 -1.924 -0.515 0.000
H9 0.672 -2.190 0.000
H10 -1.067 -2.802 0.000
H11 2.005 1.338 0.000
H12 1.843 -0.195 0.888
H13 1.843 -0.195 -0.888

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.35082.45773.71482.51321.08781.08672.64164.13654.58382.61143.22933.2293
C21.35081.48402.51671.52682.13272.13432.19002.80303.50022.16162.17132.1713
C32.45771.48401.34822.58442.69003.46331.09122.13642.12613.49812.87492.8749
C43.71482.51671.34822.99674.03744.63882.10581.08601.08564.07122.97712.9771
C52.51321.52682.58442.99673.51592.75023.54992.68414.08221.09501.09641.0964
H61.08782.13272.69004.03743.51591.84942.40884.68634.71743.69834.16124.1612
H71.08672.13433.46334.63882.75021.84943.72764.89895.57482.38793.50673.5067
H82.64162.19001.09122.10583.54992.40883.72763.08992.44264.34443.88353.8835
H94.13652.80302.13641.08602.68414.68634.89893.08991.84433.77132.47712.4771
H104.58383.50022.12611.08564.08224.71745.57482.44261.84435.15584.00664.0066
H112.61142.16163.49814.07121.09503.69832.38794.34443.77135.15581.77981.7798
H123.22932.17132.87492.97711.09644.16123.50673.88352.47714.00661.77981.7766
H133.22932.17132.87492.97711.09644.16123.50673.88352.47714.00661.77981.7766

picture of 1,3-Butadiene, 2-methyl- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 120.146 C1 C2 C5 121.588
C2 C1 H6 121.608 C2 C1 H7 121.859
C2 C3 C4 125.329 C2 C3 H8 115.673
C2 C5 H11 109.982 C2 C5 H12 110.664
C2 C5 H13 110.664 C3 C2 C5 118.266
C3 C4 H9 122.359 C3 C4 H10 121.380
C4 C3 H8 118.997 H6 C1 H7 116.533
H9 C4 H10 116.262 H11 C5 H12 108.616
H11 C5 H13 108.616 H12 C5 H13 108.235
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability