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All results from a given calculation for C6H4F2 (1,4-difluorobenzene)

using model chemistry: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-426.813715
Energy at 298.15K 
HF Energy-426.060674
Nuclear repulsion energy337.184659
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 MP2/3-21G*
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 3251 3093 0.00 219.25 0.16 0.28
2 Ag 1643 1563 0.00 7.34 0.67 0.80
3 Ag 1307 1243 0.00 13.04 0.24 0.38
4 Ag 1216 1157 0.00 6.82 0.69 0.82
5 Ag 862 820 0.00 29.89 0.11 0.20
6 Ag 466 443 0.00 5.25 0.41 0.58
7 Au 967 920 0.00 0.00 0.00 0.00
8 Au 453 431 0.00 0.00 0.50 0.00
9 B1g 845 804 0.00 6.61 0.75 0.86
10 B1u 3234 3077 2.67 0.00 0.70 0.83
11 B1u 1571 1494 173.36 0.00 0.44 0.61
12 B1u 1288 1226 84.95 0.00 0.44 0.61
13 B1u 1048 997 0.37 0.00 0.43 0.60
14 B1u 757 720 31.68 0.00 0.00 0.00
15 B2g 932 886 0.00 3.04 0.75 0.86
16 B2g 710 676 0.00 0.03 0.75 0.86
17 B2g 396 377 0.00 3.47 0.75 0.86
18 B2u 3249 3091 0.26 0.00 0.34 0.51
19 B2u 1439 1369 0.02 0.00 0.75 0.86
20 B2u 1317 1253 0.90 0.00 0.75 0.86
21 B2u 1137 1082 13.27 0.00 0.75 0.86
22 B2u 331 315 5.05 0.00 0.00 0.00
23 B3g 3235 3078 0.00 104.08 0.75 0.86
24 B3g 1601 1523 0.00 6.95 0.75 0.86
25 B3g 1350 1284 0.00 1.37 0.75 0.86
26 B3g 671 638 0.00 7.02 0.75 0.86
27 B3g 437 416 0.00 0.49 0.75 0.86
28 B3u 864 822 130.82 0.00 0.00 0.00
29 B3u 530 504 12.98 0.00 0.00 0.00
30 B3u 163 155 2.05 0.00 0.00 0.00

Unscaled Zero Point Vibrational Energy (zpe) 18635.2 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 17727.6 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 MP2/3-21G*
ABC
0.18818 0.04575 0.03680

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.390
C2 0.000 0.000 -1.390
C3 0.000 1.216 0.701
C4 0.000 -1.216 0.701
C5 0.000 -1.216 -0.701
C6 0.000 1.216 -0.701
F7 0.000 0.000 2.773
F8 0.000 0.000 -2.773
H9 0.000 2.146 1.259
H10 0.000 -2.146 1.259
H11 0.000 -2.146 -1.259
H12 0.000 2.146 -1.259

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.77981.39781.39782.41922.41921.38294.16262.14972.14973.40913.4091
C22.77982.41922.41921.39781.39784.16261.38293.40913.40912.14972.1497
C31.39782.41922.43282.80811.40242.40233.68081.08403.40813.89192.1695
C41.39782.41922.43281.40242.80812.40233.68083.40811.08402.16953.8919
C52.41921.39782.80811.40242.43283.68082.40233.89192.16951.08403.4081
C62.41921.39781.40242.80812.43283.68082.40232.16953.89193.40811.0840
F71.38294.16262.40232.40233.68083.68085.54552.62592.62594.56734.5673
F84.16261.38293.68083.68082.40232.40235.54554.56734.56732.62592.6259
H92.14973.40911.08403.40813.89192.16952.62594.56734.29154.97582.5183
H102.14973.40913.40811.08402.16953.89192.62594.56734.29152.51834.9758
H113.40912.14973.89192.16951.08403.40814.56732.62594.97582.51834.2915
H123.40912.14972.16953.89193.40811.08404.56732.62592.51834.97584.2915

picture of 1,4-difluorobenzene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 119.517 C1 C3 H9 119.504
C1 C4 C5 119.517 C1 C4 H10 119.504
C2 C5 C4 119.517 C2 C5 H11 119.504
C2 C6 C3 119.517 C2 C6 H12 119.504
C3 C1 C4 120.966 C3 C1 F7 119.517
C3 C6 H12 120.980 C4 C1 F7 119.517
C4 C5 H11 120.980 C5 C2 C6 120.966
C5 C2 F8 119.517 C5 C4 H10 120.980
C6 C2 F8 119.517 C6 C3 H9 120.980
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability