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: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-306.684663
Energy at 298.15K-306.691242
HF Energy-305.569404
Nuclear repulsion energy268.983581
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 MP2/6-31G(2df,p)
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 3252 3072 0.00      
2 A1 3217 3039 1.92      
3 A1 3065 2895 3.97      
4 A1 1743 1646 153.62      
5 A1 1686 1592 2.98      
6 A1 1456 1375 15.19      
7 A1 1417 1338 3.07      
8 A1 1194 1128 3.98      
9 A1 956 903 4.06      
10 A1 902 852 9.22      
11 A1 781 738 1.62      
12 A1 495 467 1.55      
13 A2 1211 1144 0.00      
14 A2 1014 957 0.00      
15 A2 760 717 0.00      
16 A2 355 335 0.00      
17 B1 3098 2926 2.68      
18 B1 1028 971 0.04      
19 B1 961 907 21.30      
20 B1 860 812 27.80      
21 B1 578 546 18.07      
22 B1 305 288 2.76      
23 B1 123 116 0.89      
24 B2 3252 3071 7.86      
25 B2 3217 3039 8.99      
26 B2 1664 1571 4.61      
27 B2 1432 1353 39.94      
28 B2 1389 1312 0.37      
29 B2 1283 1212 21.31      
30 B2 1141 1078 6.95      
31 B2 1009 953 5.53      
32 B2 570 539 0.50      
33 B2 445 420 14.08      

Unscaled Zero Point Vibrational Energy (zpe) 22928.1 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 21655.6 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 MP2/6-31G(2df,p)
ABC
0.17579 0.08894 0.05969

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.112
C2 0.000 0.000 -1.823
C3 0.000 1.251 0.332
C4 0.000 -1.251 0.332
C5 0.000 1.252 -1.011
C6 0.000 -1.252 -1.011
O7 0.000 0.000 2.339
H8 0.000 2.171 0.905
H9 0.000 -2.171 0.905
H10 0.000 2.193 -1.554
H11 0.000 -2.193 -1.554
H12 0.867 0.000 -2.497
H13 -0.867 0.000 -2.497

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 H8 H9 H10 H11 H12 H13
C12.93451.47411.47412.46472.46471.22682.18072.18073.45173.45173.71143.7114
C22.93452.49162.49161.49221.49224.16133.48643.48642.20922.20921.09851.0985
C31.47412.49162.50191.34322.84082.36461.08403.46962.10813.92633.21253.2125
C41.47412.49162.50192.84081.34322.36463.46961.08403.92632.10813.21253.2125
C52.46471.49221.34322.84082.50443.57612.12533.92311.08603.48752.12782.1278
C62.46471.49222.84081.34322.50443.57613.92312.12533.48751.08602.12782.1278
O71.22684.16132.36462.36463.57613.57612.60142.60144.46774.46774.91264.9126
H82.18073.48641.08403.46962.12533.92312.60144.34192.45935.00904.12804.1280
H92.18073.48643.46961.08403.92312.12532.60144.34195.00902.45934.12804.1280
H103.45172.20922.10813.92631.08603.48754.46772.45935.00904.38552.53962.5396
H113.45172.20923.92632.10813.48751.08604.46775.00902.45934.38552.53962.5396
H123.71141.09853.21253.21252.12782.12784.91264.12804.12802.53962.53961.7346
H133.71141.09853.21253.21252.12782.12784.91264.12804.12802.53962.53961.7346

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 121.988 C1 C3 H8 116.137
C1 C4 C6 121.988 C1 C4 H9 116.137
C2 C5 C3 122.896 C2 C5 H10 117.062
C2 C6 C4 122.896 C2 C6 H11 117.062
C3 C1 C4 116.128 C3 C1 O7 121.936
C3 C5 H10 120.042 C4 C1 O7 121.936
C4 C6 H11 120.042 C5 C2 C6 114.103
C5 C2 H12 109.499 C5 C2 H13 109.499
C5 C3 H8 121.875 C6 C2 H12 109.499
C6 C2 H13 109.499 C6 C4 H9 121.875
H12 C2 H13 104.283
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability