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

using model chemistry: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-429.772431
Energy at 298.15K 
HF Energy-428.434178
Nuclear repulsion energy342.032113
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 MP2/6-31G(2df,p)
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 3268 3087 0.00 240.18 0.15 0.27
2 Ag 1666 1573 0.00 6.27 0.65 0.78
3 Ag 1322 1248 0.00 14.13 0.15 0.26
4 Ag 1162 1098 0.00 8.47 0.67 0.81
5 Ag 870 821 0.00 32.21 0.08 0.15
6 Ag 450 425 0.00 4.07 0.43 0.60
7 Au 934 882 0.00 0.00 0.00 0.00
8 Au 429 405 0.00 0.00 0.00 0.00
9 B1g 825 779 0.00 3.07 0.75 0.86
10 B1u 3254 3073 1.98 0.00 0.65 0.79
11 B1u 1554 1468 267.68 0.00 0.00 0.00
12 B1u 1260 1190 132.03 0.00 0.49 0.00
13 B1u 1020 963 2.95 0.00 0.51 0.68
14 B1u 759 717 42.40 0.00 0.49 0.66
15 B2g 920 869 0.00 1.75 0.75 0.86
16 B2g 676 638 0.00 0.37 0.75 0.86
17 B2g 386 365 0.00 3.39 0.75 0.86
18 B2u 3268 3086 0.21 0.00 0.21 0.35
19 B2u 1472 1390 1.12 0.00 0.50 0.67
20 B2u 1428 1349 0.08 0.00 0.00 0.00
21 B2u 1102 1041 12.43 0.00 0.49 0.66
22 B2u 351 331 3.88 0.00 0.00 0.00
23 B3g 3256 3075 0.00 107.35 0.75 0.86
24 B3g 1655 1563 0.00 4.34 0.75 0.86
25 B3g 1276 1205 0.00 2.56 0.75 0.86
26 B3g 638 603 0.00 6.60 0.75 0.86
27 B3g 441 416 0.00 0.02 0.75 0.86
28 B3u 848 801 71.29 0.00 0.00 0.00
29 B3u 525 496 10.00 0.00 0.00 0.00
30 B3u 162 153 1.27 0.00 0.00 0.00

Unscaled Zero Point Vibrational Energy (zpe) 18586.9 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 17555.3 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 MP2/6-31G(2df,p)
ABC
0.18934 0.04768 0.03809

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.372
C2 0.000 0.000 -1.372
C3 0.000 1.213 0.697
C4 0.000 -1.213 0.697
C5 0.000 -1.213 -0.697
C6 0.000 1.213 -0.697
F7 0.000 0.000 2.708
F8 0.000 0.000 -2.708
H9 0.000 2.137 1.260
H10 0.000 -2.137 1.260
H11 0.000 -2.137 -1.260
H12 0.000 2.137 -1.260

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.74331.38821.38822.39772.39771.33674.07992.14012.14013.39033.3903
C22.74332.39772.39771.38821.38824.07991.33673.39033.39032.14012.1401
C31.38822.39772.42592.79751.39322.34913.61451.08253.39733.87982.1640
C41.38822.39772.42591.39322.79752.34913.61453.39731.08252.16403.8798
C52.39771.38822.79751.39322.42593.61452.34913.87982.16401.08253.3973
C62.39771.38821.39322.79752.42593.61452.34912.16403.87983.39731.0825
F71.33674.07992.34912.34913.61453.61455.41662.58172.58174.50734.5073
F84.07991.33673.61453.61452.34912.34915.41664.50734.50732.58172.5817
H92.14013.39031.08253.39733.87982.16402.58174.50734.27454.96212.5202
H102.14013.39033.39731.08252.16403.87982.58174.50734.27452.52024.9621
H113.39032.14013.87982.16401.08253.39734.50732.58174.96212.52024.2745
H123.39032.14012.16403.87983.39731.08254.50732.58172.52024.96214.2745

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 119.097 C1 C3 H9 119.532
C1 C4 C5 119.097 C1 C4 H10 119.532
C2 C5 C4 119.097 C2 C5 H11 119.532
C2 C6 C3 119.097 C2 C6 H12 119.532
C3 C1 C4 121.805 C3 C1 F7 119.097
C3 C6 H12 121.371 C4 C1 F7 119.097
C4 C5 H11 121.371 C5 C2 C6 121.805
C5 C2 F8 119.097 C5 C4 H10 121.371
C6 C2 F8 119.097 C6 C3 H9 121.371
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability