return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH3CHCHCH3 (2-Butene, (E)-)

using model chemistry: MP2/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2h 1Ag
Energy calculated at MP2/6-31+G**
 hartrees
Energy at 0K-156.697987
Energy at 298.15K 
HF Energy-156.126244
Nuclear repulsion energy115.796895
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 MP2/6-31+G**
Rotational Constants (cm-1) from geometry optimized at MP2/6-31+G**
ABC
1.15504 0.12430 0.11707

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31+G**

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.329 0.585 0.000
C2 -0.329 -0.585 0.000
C3 -0.329 1.932 0.000
C4 0.329 -1.932 0.000
H5 1.416 0.571 0.000
H6 -1.416 -0.571 0.000
H7 -1.415 1.835 0.000
H8 1.415 -1.835 0.000
H9 -0.039 2.512 0.878
H10 -0.039 2.512 -0.878
H11 0.039 -2.512 0.878
H12 0.039 -2.512 -0.878

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12
C11.34281.49932.51761.08752.09362.14532.65252.14922.14923.23233.2323
C21.34282.51761.49932.09361.08752.65252.14533.23233.23232.14922.1492
C31.49932.51763.92042.21372.72921.09014.15121.09161.09164.54514.5451
C42.51761.49933.92042.72922.21374.15121.09014.54514.54511.09161.0916
H51.08752.09362.21372.72923.05423.10052.40572.58012.58013.48893.4889
H62.09361.08752.72922.21373.05422.40573.10053.48893.48892.58012.5801
H72.14532.65251.09014.15123.10052.40574.63391.76711.76714.66684.6668
H82.65252.14534.15121.09012.40573.10054.63394.66684.66681.76711.7671
H92.14923.23231.09164.54512.58013.48891.76714.66681.75685.02445.3226
H102.14923.23231.09164.54512.58013.48891.76714.66681.75685.32265.0244
H113.23232.14924.54511.09163.48892.58014.66681.76715.02445.32261.7568
H123.23232.14924.54511.09163.48892.58014.66681.76715.32265.02441.7568

picture of 2-Butene, (E)- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C4 124.619 C1 C2 H6 118.589
C1 C3 H7 110.903 C1 C3 H9 111.122
C1 C3 H10 111.122 C2 C1 C3 124.619
C2 C1 H5 118.589 C2 C4 H8 110.903
C2 C4 H11 111.122 C2 C4 H12 111.122
C3 C1 H5 116.793 C4 C2 H6 116.793
H7 C3 H9 108.191 H7 C3 H10 108.191
H8 C4 H11 108.191 H8 C4 H12 108.191
H9 C3 H10 107.162 H11 C4 H12 107.162
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability