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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: MP2/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/STO-3G
 hartrees
Energy at 0K-374.826173
Energy at 298.15K-374.830106
Nuclear repulsion energy312.671097
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/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 3058 0.00      
2 Ag 1755 1530 0.00      
3 Ag 1614 1407 0.00      
4 Ag 1246 1087 0.00      
5 Ag 778 678 0.00      
6 Ag 450 392 0.00      
7 Au 1082 943 0.00      
8 Au 376 328 0.00      
9 B1g 777 677 0.00      
10 B1u 3487 3040 7.38      
11 B1u 1668 1454 4.32      
12 B1u 1485 1295 2.74      
13 B1u 970 846 0.67      
14 B1u 777 677 3.04      
15 B2g 1083 944 0.00      
16 B2g 783 683 0.00      
17 B2g 244 213 0.00      
18 B2u 3506 3057 0.12      
19 B2u 1716 1496 7.89      
20 B2u 1368 1193 71.75      
21 B2u 1143 996 24.24      
22 B2u 388 338 11.22      
23 B3g 3487 3041 0.00      
24 B3g 1510 1317 0.00      
25 B3g 1283 1119 0.00      
26 B3g 619 539 0.00      
27 B3g 458 399 0.00      
28 B3u 891 777 29.66      
29 B3u 486 423 0.85      
30 B3u 83 72 3.26      

Unscaled Zero Point Vibrational Energy (zpe) 19508.4 cm-1
Scaled (by 0.8719) Zero Point Vibrational Energy (zpe) 17009.4 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/STO-3G
ABC
0.16787 0.05123 0.03925

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/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 2.777
O8 0.000 0.000 -2.777
H9 0.000 2.239 1.248
H10 0.000 -2.239 1.248
H11 0.000 -2.239 -1.248
H12 0.000 2.239 -1.248

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.99791.53011.53012.53402.53401.27764.27552.25252.25253.54393.5439
C22.99792.53402.53401.53011.53014.27551.27763.54393.54392.25252.2525
C31.53012.53402.58562.92181.36092.46273.69081.10323.57674.02382.1483
C41.53012.53402.58561.36092.92182.46273.69083.57671.10322.14834.0238
C52.53401.53012.92181.36092.58563.69082.46274.02382.14831.10323.5767
C62.53401.53011.36092.92182.58563.69082.46272.14834.02383.57671.1032
O71.27764.27552.46272.46273.69083.69085.55322.71042.71044.60574.6057
O84.27551.27763.69083.69082.46272.46275.55324.60574.60572.71042.7104
H92.25253.54391.10323.57674.02382.14832.71044.60574.47715.12632.4970
H102.25253.54393.57671.10322.14834.02382.71044.60574.47712.49705.1263
H113.54392.25254.02382.14831.10323.57674.60572.71045.12632.49704.4771
H123.54392.25252.14834.02383.57671.10324.60572.71042.49705.12634.4771

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 122.340 C1 C3 H9 116.669
C1 C4 C5 122.340 C1 C4 H10 116.669
C2 C5 C4 122.340 C2 C5 H11 116.669
C2 C6 C3 122.340 C2 C6 H12 116.669
C3 C1 C4 115.320 C3 C1 O7 122.340
C3 C6 H12 120.991 C4 C1 O7 122.340
C4 C5 H11 120.991 C5 C2 C6 115.320
C5 C2 O8 122.340 C5 C4 H10 120.991
C6 C2 O8 122.340 C6 C3 H9 120.991
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability