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

using model chemistry: MP2/CEP-121G*

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/CEP-121G*
 hartrees
Energy at 0K-84.091234
Energy at 298.15K 
HF Energy-82.984197
Nuclear repulsion energy173.426496
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/CEP-121G*
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 3245 3092 0.00 275.11 0.16 0.27
2 Ag 1645 1567 0.00 5.49 0.68 0.81
3 Ag 1269 1210 0.00 19.08 0.13 0.23
4 Ag 1164 1109 0.00 7.24 0.62 0.76
5 Ag 852 812 0.00 36.77 0.08 0.15
6 Ag 446 425 0.00 5.50 0.45 0.62
7 Au 805 767 0.00 0.00 0.00 0.00
8 Au 387 369 0.00 0.00 0.00 0.00
9 B1g 778 742 0.00 0.21 0.75 0.86
10 B1u 3232 3079 3.86 0.00 0.74 0.85
11 B1u 1534 1462 262.73 0.00 0.48 0.65
12 B1u 1219 1161 187.22 0.00 0.46 0.63
13 B1u 1021 973 5.05 0.00 0.46 0.00
14 B1u 738 703 55.26 0.00 0.61 0.76
15 B2g 787 750 0.00 0.04 0.75 0.86
16 B2g 404 385 0.00 5.33 0.75 0.86
17 B2g 306i 292i 0.00 0.02 0.75 0.86
18 B2u 3245 3092 0.92 0.00 0.15 0.26
19 B2u 1446 1378 0.84 0.00 0.48 0.65
20 B2u 1415 1348 0.08 0.00 0.50 0.66
21 B2u 1104 1052 13.57 0.00 0.51 0.68
22 B2u 341 325 5.18 0.00 0.51 0.67
23 B3g 3234 3081 0.00 112.71 0.75 0.86
24 B3g 1646 1568 0.00 6.25 0.75 0.86
25 B3g 1294 1232 0.00 1.50 0.75 0.86
26 B3g 634 604 0.00 7.89 0.75 0.86
27 B3g 434 413 0.00 0.06 0.75 0.86
28 B3u 794 756 112.84 0.00 0.00 0.00
29 B3u 485 463 13.98 0.00 0.00 0.00
30 B3u 153 146 1.66 0.00 0.00 0.00

Unscaled Zero Point Vibrational Energy (zpe) 17721.7 cm-1
Scaled (by 0.9528) Zero Point Vibrational Energy (zpe) 16885.2 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/CEP-121G*
ABC
0.18446 0.04672 0.03728

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.373
C2 0.000 0.000 -1.373
C3 0.000 1.230 0.704
C4 0.000 -1.230 0.704
C5 0.000 -1.230 -0.704
C6 0.000 1.230 -0.704
F7 0.000 0.000 2.740
F8 0.000 0.000 -2.740
H9 0.000 2.157 1.271
H10 0.000 -2.157 1.271
H11 0.000 -2.157 -1.271
H12 0.000 2.157 -1.271

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.74591.40041.40042.41352.41351.36724.11312.15932.15933.41203.4120
C22.74592.41352.41351.40041.40044.11311.36723.41203.41202.15932.1593
C31.40042.41352.46022.83421.40722.37923.65681.08663.43413.92042.1811
C41.40042.41352.46021.40722.83422.37923.65683.43411.08662.18113.9204
C52.41351.40042.83421.40722.46023.65682.37923.92042.18111.08663.4341
C62.41351.40041.40722.83422.46023.65682.37922.18113.92043.43411.0866
F71.36724.11312.37922.37923.65683.65685.48022.60972.60974.55414.5541
F84.11311.36723.65683.65682.37922.37925.48024.55414.55412.60972.6097
H92.15933.41201.08663.43413.92042.18112.60974.55414.31375.00682.5417
H102.15933.41203.43411.08662.18113.92042.60974.55414.31372.54175.0068
H113.41202.15933.92042.18111.08663.43414.55412.60975.00682.54174.3137
H123.41202.15932.18113.92043.43411.08664.55412.60972.54175.00684.3137

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 118.552 C1 C3 H9 119.977
C1 C4 C5 118.552 C1 C4 H10 119.977
C2 C5 C4 118.552 C2 C5 H11 119.977
C2 C6 C3 118.552 C2 C6 H12 119.977
C3 C1 C4 122.895 C3 C1 F7 118.552
C3 C6 H12 121.471 C4 C1 F7 118.552
C4 C5 H11 121.471 C5 C2 C6 122.895
C5 C2 F8 118.552 C5 C4 H10 121.471
C6 C2 F8 118.552 C6 C3 H9 121.471
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability