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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: MP3/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP3/6-31G*
 hartrees
Energy at 0K-380.343580
Energy at 298.15K-380.347912
Nuclear repulsion energy322.266042
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 MP3/6-31G*
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 3270 3070 0.00      
2 Ag 1843 1730 0.00      
3 Ag 1734 1628 0.00      
4 Ag 1200 1127 0.00      
5 Ag 796 747 0.00      
6 Ag 461 432 0.00      
7 Au 970 910 0.00      
8 Au 326 306 0.00      
9 B1g 748 702 0.00      
10 B1u 3253 3053 0.46      
11 B1u 1842 1729 241.91      
12 B1u 1421 1334 6.45      
13 B1u 972 912 9.56      
14 B1u 775 728 0.48      
15 B2g 966 907 0.00      
16 B2g 707 663 0.00      
17 B2g 197 185 0.00      
18 B2u 3268 3068 3.65      
19 B2u 1711 1606 15.33      
20 B2u 1375 1290 82.84      
21 B2u 1119 1050 40.93      
22 B2u 422 396 29.86      
23 B3g 3253 3053 0.00      
24 B3g 1454 1365 0.00      
25 B3g 1284 1205 0.00      
26 B3g 618 580 0.00      
27 B3g 460 432 0.00      
28 B3u 884 830 94.92      
29 B3u 507 476 2.74      
30 B3u 91 86 13.78      

Unscaled Zero Point Vibrational Energy (zpe) 18963.2 cm-1
Scaled (by 0.9386) Zero Point Vibrational Energy (zpe) 17798.9 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 MP3/6-31G*
ABC
0.17394 0.05534 0.04198

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3/6-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.441
C2 0.000 0.000 -1.441
C3 0.000 1.272 0.671
C4 0.000 -1.272 0.671
C5 0.000 -1.272 -0.671
C6 0.000 1.272 -0.671
O7 0.000 0.000 2.662
O8 0.000 0.000 -2.662
H9 0.000 2.185 1.259
H10 0.000 -2.185 1.259
H11 0.000 -2.185 -1.259
H12 0.000 2.185 -1.259

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88291.48711.48712.46602.46601.22094.10382.19282.19283.47373.4737
C22.88292.46602.46601.48711.48714.10381.22093.47373.47372.19282.1928
C31.48712.46602.54412.87651.34242.36283.56801.08593.50683.95952.1352
C41.48712.46602.54411.34242.87652.36283.56803.50681.08592.13523.9595
C52.46601.48712.87651.34242.54413.56802.36283.95952.13521.08593.5068
C62.46601.48711.34242.87652.54413.56802.36282.13523.95953.50681.0859
O71.22094.10382.36282.36283.56803.56805.32472.59702.59704.48904.4890
O84.10381.22093.56803.56802.36282.36285.32474.48904.48902.59702.5970
H92.19283.47371.08593.50683.95952.13522.59704.48904.37045.04382.5178
H102.19283.47373.50681.08592.13523.95952.59704.48904.37042.51785.0438
H113.47372.19283.95952.13521.08593.50684.48902.59705.04382.51784.3704
H123.47372.19282.13523.95953.50681.08594.48902.59702.51785.04384.3704

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.196 C1 C3 H9 116.037
C1 C4 C5 121.196 C1 C4 H10 116.037
C2 C5 C4 121.196 C2 C5 H11 116.037
C2 C6 C3 121.196 C2 C6 H12 116.037
C3 C1 C4 117.608 C3 C1 O7 121.196
C3 C6 H12 122.767 C4 C1 O7 121.196
C4 C5 H11 122.767 C5 C2 C6 117.608
C5 C2 O8 121.196 C5 C4 H10 122.767
C6 C2 O8 121.196 C6 C3 H9 122.767
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability