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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: mPW1PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at mPW1PW91/3-21G*
 hartrees
Energy at 0K-379.242371
Energy at 298.15K-379.247083
Nuclear repulsion energy321.884688
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 mPW1PW91/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Ag 3259 3095 0.00      
2 Ag 1746 1658 0.00      
3 Ag 1686 1601 0.00      
4 Ag 1218 1156 0.00      
5 Ag 778 739 0.00      
6 Ag 469 445 0.00      
7 Au 1106 1050 0.00      
8 Au 377 358 0.00      
9 B1g 819 777 0.00      
10 B1u 3237 3074 0.29      
11 B1u 1729 1642 184.30      
12 B1u 1418 1346 7.77      
13 B1u 965 916 14.77      
14 B1u 761 723 1.29      
15 B2g 1119 1063 0.00      
16 B2g 873 829 0.00      
17 B2g 295 280 0.00      
18 B2u 3255 3091 3.09      
19 B2u 1681 1597 18.63      
20 B2u 1334 1267 48.64      
21 B2u 1093 1038 82.86      
22 B2u 401 381 22.49      
23 B3g 3237 3074 0.00      
24 B3g 1416 1345 0.00      
25 B3g 1242 1180 0.00      
26 B3g 614 583 0.00      
27 B3g 457 434 0.00      
28 B3u 978 928 113.58      
29 B3u 549 521 13.85      
30 B3u 109 103 10.65      

Unscaled Zero Point Vibrational Energy (zpe) 19109.7 cm-1
Scaled (by 0.9496) Zero Point Vibrational Energy (zpe) 18146.5 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 mPW1PW91/3-21G*
ABC
0.17853 0.05434 0.04166

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.453
C2 0.000 0.000 -1.453
C3 0.000 1.254 0.669
C4 0.000 -1.254 0.669
C5 0.000 -1.254 -0.669
C6 0.000 1.254 -0.669
O7 0.000 0.000 2.692
O8 0.000 0.000 -2.692
H9 0.000 2.170 1.246
H10 0.000 -2.170 1.246
H11 0.000 -2.170 -1.246
H12 0.000 2.170 -1.246

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.90551.47871.47872.46422.46421.23954.14502.17942.17943.46283.4628
C22.90552.46422.46421.47871.47874.14501.23953.46283.46282.17942.1794
C31.47872.46422.50752.84181.33732.38053.58711.08273.47173.92252.1225
C41.47872.46422.50751.33732.84182.38053.58713.47171.08272.12253.9225
C52.46421.47872.84181.33732.50753.58712.38053.92252.12251.08273.4717
C62.46421.47871.33732.84182.50753.58712.38052.12253.92253.47171.0827
O71.23954.14502.38052.38053.58713.58715.38452.60742.60744.49644.4964
O84.14501.23953.58713.58712.38052.38055.38454.49644.49642.60742.6074
H92.17943.46281.08273.47173.92252.12252.60744.49644.33925.00402.4922
H102.17943.46283.47171.08272.12253.92252.60744.49644.33922.49225.0040
H113.46282.17943.92252.12251.08273.47174.49642.60745.00402.49224.3392
H123.46282.17942.12253.92253.47171.08274.49642.60742.49225.00404.3392

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 122.023 C1 C3 H9 115.746
C1 C4 C5 122.023 C1 C4 H10 115.746
C2 C5 C4 122.023 C2 C5 H11 115.746
C2 C6 C3 122.023 C2 C6 H12 115.746
C3 C1 C4 115.955 C3 C1 O7 122.023
C3 C6 H12 122.232 C4 C1 O7 122.023
C4 C5 H11 122.232 C5 C2 C6 115.955
C5 C2 O8 122.023 C5 C4 H10 122.232
C6 C2 O8 122.023 C6 C3 H9 122.232
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.389      
2 C 0.389      
3 C -0.230      
4 C -0.230      
5 C -0.230      
6 C -0.230      
7 O -0.462      
8 O -0.462      
9 H 0.266      
10 H 0.266      
11 H 0.266      
12 H 0.266      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -45.934 0.000 0.000
y 0.000 -36.876 0.000
z 0.000 0.000 -59.898
Traceless
 xyz
x 2.453 0.000 0.000
y 0.000 16.040 0.000
z 0.000 0.000 -18.493
Polar
3z2-r2-36.986
x2-y2-9.058
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.743 0.000 0.000
y 0.000 7.932 0.000
z 0.000 0.000 14.611


<r2> (average value of r2) Å2
<r2> 244.505
(<r2>)1/2 15.637