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, (Z)-)

using model chemistry: QCISD/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at QCISD/cc-pVTZ
 hartrees
Energy at 0K-156.894519
Energy at 298.15K-156.902227
HF Energy-156.165190
Nuclear repulsion energy117.627387
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 QCISD/cc-pVTZ
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 3182 3040 45.80      
2 A1 3154 3014 10.66      
3 A1 3052 2916 11.71      
4 A1 1756 1678 3.86      
5 A1 1518 1450 4.61      
6 A1 1439 1375 3.50      
7 A1 1301 1243 0.00      
8 A1 1037 991 0.78      
9 A1 882 843 0.45      
10 A1 296 283 0.00      
11 A2 3101 2963 0.00      
12 A2 1502 1435 0.00      
13 A2 1073 1026 0.00      
14 A2 1013 968 0.00      
15 A2 395 377 0.00      
16 A2 119 113 0.00      
17 B1 3101 2963 41.12      
18 B1 1508 1441 9.86      
19 B1 1081 1033 4.98      
20 B1 708 676 35.44      
21 B1 122 116 0.63      
22 B2 3157 3016 14.34      
23 B2 3138 2998 7.27      
24 B2 3049 2913 38.69      
25 B2 1510 1443 3.59      
26 B2 1461 1396 6.37      
27 B2 1404 1342 2.29      
28 B2 1173 1121 0.18      
29 B2 995 951 10.87      
30 B2 567 542 4.96      

Unscaled Zero Point Vibrational Energy (zpe) 23896.1 cm-1
Scaled (by 0.9555) Zero Point Vibrational Energy (zpe) 22832.7 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 QCISD/cc-pVTZ
ABC
0.54229 0.17047 0.13620

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.671 0.646
C2 0.000 -0.671 0.646
C3 0.000 1.634 -0.511
C4 0.000 -1.634 -0.511
H5 0.000 1.152 1.618
H6 0.000 -1.152 1.618
H7 0.000 1.155 -1.484
H8 0.000 -1.155 -1.484
H9 -0.876 2.287 -0.471
H10 0.876 2.287 -0.471
H11 0.876 -2.287 -0.471
H12 -0.876 -2.287 -0.471

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12
C11.34211.50522.57921.08442.06592.18352.80502.15022.15023.28043.2804
C21.34212.57921.50522.06591.08442.80502.18353.28043.28042.15022.1502
C31.50522.57923.26842.18273.50631.08422.95381.09271.09274.01764.0176
C42.57921.50523.26843.50632.18272.95381.08424.01764.01761.09271.0927
H51.08442.06592.18273.50632.30383.10123.86512.53302.53304.11734.1173
H62.06591.08443.50632.18272.30383.86513.10124.11734.11732.53302.5330
H72.18352.80501.08422.95383.10123.86512.30981.75301.75303.69283.6928
H82.80502.18352.95381.08423.86513.10122.30983.69283.69281.75301.7530
H92.15023.28041.09274.01762.53304.11731.75303.69281.75104.89714.5734
H102.15023.28041.09274.01762.53304.11731.75303.69281.75104.57344.8971
H113.28042.15024.01761.09274.11732.53303.69281.75304.89714.57341.7510
H123.28042.15024.01761.09274.11732.53303.69281.75304.57344.89711.7510

picture of 2-Butene, (Z)- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C4 129.781 C1 C2 H6 116.323
C1 C3 H7 113.983 C1 C3 H9 110.720
C1 C3 H10 110.720 C2 C1 C3 129.781
C2 C1 H5 116.323 C2 C4 H8 113.983
C2 C4 H11 110.720 C2 C4 H12 110.720
C3 C1 H5 113.896 C4 C2 H6 113.896
H7 C3 H9 107.278 H7 C3 H10 107.278
H8 C4 H11 107.278 H8 C4 H12 107.278
H9 C3 H10 106.504 H11 C4 H12 106.504
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability