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All results from a given calculation for C6H4O2 (parabenzoquinone)

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

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2=FULL/STO-3G
 hartrees
Energy at 0K-374.829008
Energy at 298.15K-374.832942
Nuclear repulsion energy312.715707
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/STO-3G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Ag 3508 3118 0.00      
2 Ag 1755 1560 0.00      
3 Ag 1614 1435 0.00      
4 Ag 1246 1108 0.00      
5 Ag 779 692 0.00      
6 Ag 450 400 0.00      
7 Au 1082 962 0.00      
8 Au 376 334 0.00      
9 B1g 777 690 0.00      
10 B1u 3488 3100 7.36      
11 B1u 1668 1483 4.27      
12 B1u 1485 1320 2.76      
13 B1u 971 863 0.67      
14 B1u 777 691 3.03      
15 B2g 1083 963 0.00      
16 B2g 783 696 0.00      
17 B2g 244 217 0.00      
18 B2u 3507 3117 0.12      
19 B2u 1717 1526 7.91      
20 B2u 1368 1216 71.68      
21 B2u 1143 1016 24.16      
22 B2u 388 345 11.22      
23 B3g 3488 3101 0.00      
24 B3g 1510 1343 0.00      
25 B3g 1284 1141 0.00      
26 B3g 619 550 0.00      
27 B3g 458 407 0.00      
28 B3u 891 792 29.62      
29 B3u 486 432 0.85      
30 B3u 83 74 3.26      

Unscaled Zero Point Vibrational Energy (zpe) 19513.1 cm-1
Scaled (by 0.8889) Zero Point Vibrational Energy (zpe) 17345.2 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/STO-3G
ABC
0.16793 0.05124 0.03926

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.499
C2 0.000 0.000 -1.499
C3 0.000 1.293 0.680
C4 0.000 -1.293 0.680
C5 0.000 -1.293 -0.680
C6 0.000 1.293 -0.680
O7 0.000 0.000 2.776
O8 0.000 0.000 -2.776
H9 0.000 2.238 1.248
H10 0.000 -2.238 1.248
H11 0.000 -2.238 -1.248
H12 0.000 2.238 -1.248

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.99741.52981.52982.53352.53351.27764.27492.25222.25223.54343.5434
C22.99742.53352.53351.52981.52984.27491.27763.54343.54342.25222.2522
C31.52982.53352.58502.92131.36072.46243.69041.10323.57614.02322.1481
C41.52982.53352.58501.36072.92132.46243.69043.57611.10322.14814.0232
C52.53351.52982.92131.36072.58503.69042.46244.02322.14811.10323.5761
C62.53351.52981.36072.92132.58503.69042.46242.14814.02323.57611.1032
O71.27764.27492.46242.46243.69043.69045.55252.71002.71004.60514.6051
O84.27491.27763.69043.69042.46242.46245.55254.60514.60512.71002.7100
H92.25223.54341.10323.57614.02322.14812.71004.60514.47645.12562.4967
H102.25223.54343.57611.10322.14814.02322.71004.60514.47642.49675.1256
H113.54342.25224.02322.14811.10323.57614.60512.71005.12562.49674.4764
H123.54342.25222.14814.02323.57611.10324.60512.71002.49675.12564.4764

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 122.339 C1 C3 H9 116.671
C1 C4 C5 122.339 C1 C4 H10 116.671
C2 C5 C4 122.339 C2 C5 H11 116.671
C2 C6 C3 122.339 C2 C6 H12 116.671
C3 C1 C4 115.322 C3 C1 O7 122.339
C3 C6 H12 120.989 C4 C1 O7 122.339
C4 C5 H11 120.989 C5 C2 C6 115.322
C5 C2 O8 122.339 C5 C4 H10 120.989
C6 C2 O8 122.339 C6 C3 H9 120.989
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability