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

using model chemistry: MP2=FULL/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=FULL/6-31G(2df,p)
 hartrees
Energy at 0K-429.832002
Energy at 298.15K 
HF Energy-428.434986
Nuclear repulsion energy343.016637
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=FULL/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 3277 3080 0.00 238.32 0.15 0.27
2 Ag 1678 1577 0.00 6.31 0.63 0.77
3 Ag 1331 1251 0.00 14.01 0.15 0.26
4 Ag 1167 1097 0.00 8.40 0.68 0.81
5 Ag 871 819 0.00 31.73 0.08 0.15
6 Ag 451 424 0.00 3.98 0.43 0.60
7 Au 946 889 0.00 0.00 0.00 0.00
8 Au 442 416 0.00 0.00 0.00 0.00
9 B1g 833 783 0.00 3.06 0.75 0.86
10 B1u 3262 3066 2.08 0.00 0.65 0.79
11 B1u 1562 1468 275.22 0.00 0.00 0.00
12 B1u 1265 1189 126.89 0.00 0.49 0.00
13 B1u 1022 961 3.49 0.00 0.51 0.67
14 B1u 764 718 41.76 0.00 0.49 0.66
15 B2g 940 884 0.00 1.87 0.75 0.86
16 B2g 736 692 0.00 0.18 0.75 0.86
17 B2g 396 372 0.00 3.45 0.75 0.86
18 B2u 3276 3079 0.20 0.00 0.29 0.46
19 B2u 1484 1395 1.15 0.00 0.50 0.66
20 B2u 1432 1346 0.05 0.00 0.00 0.00
21 B2u 1106 1039 12.53 0.00 0.49 0.66
22 B2u 353 332 3.82 0.00 0.00 0.00
23 B3g 3264 3068 0.00 106.14 0.75 0.86
24 B3g 1662 1562 0.00 4.23 0.75 0.86
25 B3g 1275 1198 0.00 2.60 0.75 0.86
26 B3g 642 603 0.00 6.54 0.75 0.86
27 B3g 444 417 0.00 0.02 0.75 0.86
28 B3u 863 811 69.77 0.00 0.00 0.00
29 B3u 541 508 11.38 0.00 0.00 0.00
30 B3u 164 155 1.24 0.00 0.00 0.00

Unscaled Zero Point Vibrational Energy (zpe) 18723.2 cm-1
Scaled (by 0.9399) Zero Point Vibrational Energy (zpe) 17597.9 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 MP2=FULL/6-31G(2df,p)
ABC
0.19078 0.04791 0.03829

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

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 1.208 0.694
C4 0.000 -1.208 0.694
C5 0.000 -1.208 -0.694
C6 0.000 1.208 -0.694
F7 0.000 0.000 2.702
F8 0.000 0.000 -2.702
H9 0.000 2.131 1.257
H10 0.000 -2.131 1.257
H11 0.000 -2.131 -1.257
H12 0.000 2.131 -1.257

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.73851.38371.38372.39122.39121.33254.07102.13432.13433.38193.3819
C22.73852.39122.39121.38371.38374.07101.33253.38193.38192.13432.1343
C31.38372.39122.41612.78681.38892.34283.60471.08103.38643.86752.1584
C41.38372.39122.41611.38892.78682.34283.60473.38641.08102.15843.8675
C52.39121.38372.78681.38892.41613.60472.34283.86752.15841.08103.3864
C62.39121.38371.38892.78682.41613.60472.34282.15843.86753.38641.0810
F71.33254.07102.34282.34283.60473.60475.40362.57512.57514.49574.4957
F84.07101.33253.60473.60472.34282.34285.40364.49574.49572.57512.5751
H92.13433.38191.08103.38643.86752.15842.57514.49574.26274.94842.5131
H102.13433.38193.38641.08102.15843.86752.57514.49574.26272.51314.9484
H113.38192.13433.86752.15841.08103.38644.49572.57514.94842.51314.2627
H123.38192.13432.15843.86753.38641.08104.49572.57512.51314.94844.2627

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 119.188 C1 C3 H9 119.478
C1 C4 C5 119.188 C1 C4 H10 119.478
C2 C5 C4 119.188 C2 C5 H11 119.478
C2 C6 C3 119.188 C2 C6 H12 119.478
C3 C1 C4 121.625 C3 C1 F7 119.188
C3 C6 H12 121.334 C4 C1 F7 119.188
C4 C5 H11 121.334 C5 C2 C6 121.625
C5 C2 F8 119.188 C5 C4 H10 121.334
C6 C2 F8 119.188 C6 C3 H9 121.334
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability