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

using model chemistry: QCISD/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 QCISD/6-31G*
 hartrees
Energy at 0K-429.528114
Energy at 298.15K-429.532765
Nuclear repulsion energy340.294538
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 QCISD/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 3246 3091 0.00      
2 Ag 1712 1630 0.00      
3 Ag 1320 1257 0.00      
4 Ag 1189 1132 0.00      
5 Ag 881 839 0.00      
6 Ag 457 435 0.00      
7 Au 912 868 0.00      
8 Au 423 403 0.00      
9 B1g 813 774 0.00      
10 B1u 3232 3078 4.89      
11 B1u 1589 1514 236.37      
12 B1u 1268 1207 141.14      
13 B1u 1045 995 3.97      
14 B1u 753 717 47.59      
15 B2g 868 826 0.00      
16 B2g 566 539 0.00      
17 B2g 374 356 0.00      
18 B2u 3245 3091 1.93      
19 B2u 1478 1407 0.11      
20 B2u 1298 1236 1.74      
21 B2u 1128 1074 12.78      
22 B2u 348 331 5.26      
23 B3g 3234 3079 0.00      
24 B3g 1701 1620 0.00      
25 B3g 1322 1259 0.00      
26 B3g 652 621 0.00      
27 B3g 446 425 0.00      
28 B3u 827 788 94.82      
29 B3u 506 482 7.89      
30 B3u 162 155 1.85      

Unscaled Zero Point Vibrational Energy (zpe) 18496.7 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 17614.4 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 QCISD/6-31G*
ABC
0.18771 0.04720 0.03772

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.369
C2 0.000 0.000 -1.369
C3 0.000 1.218 0.698
C4 0.000 -1.218 0.698
C5 0.000 -1.218 -0.698
C6 0.000 1.218 -0.698
F7 0.000 0.000 2.726
F8 0.000 0.000 -2.726
H9 0.000 2.146 1.265
H10 0.000 -2.146 1.265
H11 0.000 -2.146 -1.265
H12 0.000 2.146 -1.265

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.73731.39051.39052.39932.39931.35724.09452.14822.14823.39723.3972
C22.73732.39932.39931.39051.39054.09451.35723.39723.39722.14822.1482
C31.39052.39932.43662.80851.39672.36533.63441.08693.41143.89512.1715
C41.39052.39932.43661.39672.80852.36533.63443.41141.08692.17153.8951
C52.39931.39052.80851.39672.43663.63442.36533.89512.17151.08693.4114
C62.39931.39051.39672.80852.43663.63442.36532.17153.89513.41141.0869
F71.35724.09452.36532.36533.63443.63445.45162.59572.59574.53124.5312
F84.09451.35723.63443.63442.36532.36535.45164.53124.53122.59572.5957
H92.14823.39721.08693.41143.89512.17152.59574.53124.29144.98192.5304
H102.14823.39723.41141.08692.17153.89512.59574.53124.29142.53044.9819
H113.39722.14823.89512.17151.08693.41144.53122.59574.98192.53044.2914
H123.39722.14822.17153.89513.41141.08694.53122.59572.53044.98194.2914

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 118.819 C1 C3 H9 119.747
C1 C4 C5 118.819 C1 C4 H10 119.747
C2 C5 C4 118.819 C2 C5 H11 119.747
C2 C6 C3 118.819 C2 C6 H12 119.747
C3 C1 C4 122.362 C3 C1 F7 118.819
C3 C6 H12 121.434 C4 C1 F7 118.819
C4 C5 H11 121.434 C5 C2 C6 122.362
C5 C2 F8 118.819 C5 C4 H10 121.434
C6 C2 F8 118.819 C6 C3 H9 121.434
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability