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

using model chemistry: MP2/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/6-31G*
 hartrees
Energy at 0K-429.494135
Energy at 298.15K 
HF Energy-428.401151
Nuclear repulsion energy340.368673
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*
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 3270 3084 0.00 246.43 0.16 0.27
2 Ag 1692 1596 0.00 6.95 0.68 0.81
3 Ag 1314 1239 0.00 13.81 0.17 0.29
4 Ag 1189 1121 0.00 8.85 0.67 0.80
5 Ag 878 828 0.00 30.09 0.10 0.18
6 Ag 455 429 0.00 4.46 0.46 0.63
7 Au 882 831 0.00 0.00 0.50 0.67
8 Au 417 393 0.00 0.00 0.50 0.67
9 B1g 796 751 0.00 5.22 0.75 0.86
10 B1u 3257 3071 2.88 0.00 0.00 0.00
11 B1u 1577 1487 245.88 0.00 0.00 0.00
12 B1u 1262 1190 144.04 0.00 0.00 0.00
13 B1u 1042 983 3.89 0.00 0.00 0.00
14 B1u 754 711 48.46 0.00 0.00 0.00
15 B2g 848 800 0.00 2.40 0.75 0.86
16 B2g 507 478 0.00 2.24 0.75 0.86
17 B2g 363 342 0.00 2.53 0.75 0.86
18 B2u 3270 3083 0.11 0.00 0.00 0.00
19 B2u 1483 1398 0.68 0.00 0.00 0.00
20 B2u 1449 1367 0.25 0.00 0.00 0.00
21 B2u 1130 1065 12.83 0.00 0.00 0.00
22 B2u 347 327 4.87 0.00 0.00 0.00
23 B3g 3259 3074 0.00 113.83 0.75 0.86
24 B3g 1685 1589 0.00 5.39 0.75 0.86
25 B3g 1319 1244 0.00 2.11 0.75 0.86
26 B3g 648 611 0.00 7.17 0.75 0.86
27 B3g 442 417 0.00 0.12 0.75 0.86
28 B3u 810 764 96.44 0.00 0.00 0.00
29 B3u 501 472 8.17 0.00 0.00 0.00
30 B3u 160 151 1.60 0.00 0.00 0.00

Unscaled Zero Point Vibrational Energy (zpe) 18502.1 cm-1
Scaled (by 0.943) Zero Point Vibrational Energy (zpe) 17447.5 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*
ABC
0.18788 0.04721 0.03773

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.368
C2 0.000 0.000 -1.368
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 2.144 1.264
H10 0.000 -2.144 1.264
H11 0.000 -2.144 -1.264
H12 0.000 2.144 -1.264

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.73691.39041.39042.39852.39851.35754.09442.14632.14633.39523.3952
C22.73692.39852.39851.39041.39044.09441.35753.39523.39522.14632.1463
C31.39042.39852.43592.80731.39562.36583.63391.08543.40913.89242.1696
C41.39042.39852.43591.39562.80732.36583.63393.40911.08542.16963.8924
C52.39851.39042.80731.39562.43593.63392.36583.89242.16961.08543.4091
C62.39851.39041.39562.80732.43593.63392.36582.16963.89243.40911.0854
F71.35754.09442.36582.36583.63393.63395.45192.59462.59464.52974.5297
F84.09441.35753.63393.63392.36582.36585.45194.52974.52972.59462.5946
H92.14633.39521.08543.40913.89242.16962.59464.52974.28754.97762.5287
H102.14633.39523.40911.08542.16963.89242.59464.52974.28752.52874.9776
H113.39522.14633.89242.16961.08543.40914.52972.59464.97762.52874.2875
H123.39522.14632.16963.89243.40911.08544.52972.59462.52874.97764.2875

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 118.840 C1 C3 H9 119.697
C1 C4 C5 118.840 C1 C4 H10 119.697
C2 C5 C4 118.840 C2 C5 H11 119.697
C2 C6 C3 118.840 C2 C6 H12 119.697
C3 C1 C4 122.320 C3 C1 F7 118.840
C3 C6 H12 121.463 C4 C1 F7 118.840
C4 C5 H11 121.463 C5 C2 C6 122.320
C5 C2 F8 118.840 C5 C4 H10 121.463
C6 C2 F8 118.840 C6 C3 H9 121.463
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability