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 C6H6O (2,5-Cyclohexadienone)

using model chemistry: MP2=FULL/3-21G

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=FULL/3-21G
 hartrees
Energy at 0K-304.485841
Energy at 298.15K-304.492462
HF Energy-303.822771
Nuclear repulsion energy265.733026
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=FULL/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 A1 3218 3073 0.14      
2 A1 3183 3039 5.43      
3 A1 3054 2916 4.45      
4 A1 1691 1614 24.33      
5 A1 1609 1536 29.77      
6 A1 1547 1477 10.05      
7 A1 1452 1386 1.57      
8 A1 1254 1197 3.26      
9 A1 979 934 2.34      
10 A1 860 821 5.37      
11 A1 745 711 2.45      
12 A1 514 491 0.92      
13 A2 1274 1216 0.00      
14 A2 1025 979 0.00      
15 A2 768 733 0.00      
16 A2 369 353 0.00      
17 B1 3078 2939 6.50      
18 B1 1037 990 2.44      
19 B1 999 954 15.41      
20 B1 869 830 51.77      
21 B1 593 566 33.75      
22 B1 305 291 1.56      
23 B1 118 112 0.45      
24 B2 3216 3070 19.76      
25 B2 3181 3038 11.02      
26 B2 1646 1571 3.68      
27 B2 1440 1375 11.41      
28 B2 1385 1323 5.45      
29 B2 1291 1233 23.26      
30 B2 1170 1117 29.00      
31 B2 982 938 10.63      
32 B2 586 560 2.02      
33 B2 438 418 10.43      

Unscaled Zero Point Vibrational Energy (zpe) 22936.3 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 21899.6 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=FULL/3-21G
ABC
0.17285 0.08611 0.05810

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.126
C2 0.000 0.000 -1.857
C3 0.000 1.259 0.327
C4 0.000 -1.259 0.327
C5 0.000 1.266 -1.021
C6 0.000 -1.266 -1.021
O7 0.000 0.000 2.386
H8 0.000 2.184 0.897
H9 0.000 -2.184 0.897
H10 0.000 2.209 -1.565
H11 0.000 -2.209 -1.565
H12 0.880 0.000 -2.519
H13 -0.880 0.000 -2.519

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 H8 H9 H10 H11 H12 H13
C12.98261.49061.49062.49272.49271.26062.19572.19573.48163.48163.74913.7491
C22.98262.52092.52091.51731.51734.24333.51453.51452.22812.22811.10121.1012
C31.49062.52092.51751.34862.86272.41341.08633.48932.11783.95053.23393.2339
C41.49062.52092.51752.86271.34862.41343.48931.08633.95052.11783.23393.2339
C52.49271.51731.34862.86272.53283.63542.12623.94751.08833.51772.14962.1496
C62.49271.51732.86271.34862.53283.63543.94752.12623.51771.08832.14962.1496
O71.26064.24332.41342.41343.63543.63542.64342.64344.52724.52724.98334.9833
H82.19573.51451.08633.48932.12623.94752.64344.36742.46235.03574.14834.1483
H92.19573.51453.48931.08633.94752.12622.64344.36745.03572.46234.14834.1483
H103.48162.22812.11783.95051.08833.51774.52722.46235.03574.41792.56182.5618
H113.48162.22813.95052.11783.51771.08834.52725.03572.46234.41792.56182.5618
H123.74911.10123.23393.23392.14962.14964.98334.14834.14832.56182.56181.7606
H133.74911.10123.23393.23392.14962.14964.98334.14834.14832.56182.56181.7606

picture of 2,5-Cyclohexadienone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C5 122.716 C1 C3 H8 115.987
C1 C4 C6 122.716 C1 C4 H9 115.987
C2 C5 C3 123.091 C2 C5 H10 116.587
C2 C6 C4 123.091 C2 C6 H11 116.587
C3 C1 C4 115.223 C3 C1 O7 122.389
C3 C5 H10 120.322 C4 C1 O7 122.389
C4 C6 H11 120.322 C5 C2 C6 113.165
C5 C2 H12 109.324 C5 C2 H13 109.324
C5 C3 H8 121.297 C6 C2 H12 109.324
C6 C2 H13 109.324 C6 C4 H9 121.297
H12 C2 H13 106.140
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability