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

using model chemistry: MP4/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP4/6-31G*
 hartrees
Energy at 0K-429.574630
Energy at 298.15K-429.579124
Nuclear repulsion energy339.232443
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 MP4/6-31G*
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 3226 3080        
2 Ag 1673 1597        
3 Ag 1294 1236        
4 Ag 1175 1122        
5 Ag 865 826        
6 Ag 449 429        
7 Au 874 835        
8 Au 412 394        
9 B1g 787 751        
10 B1u 3212 3067        
11 B1u 1560 1489        
12 B1u 1245 1189        
13 B1u 1029 983        
14 B1u 742 708        
15 B2g 838 800        
16 B2g 512 489        
17 B2g 361 345        
18 B2u 3226 3080        
19 B2u 1453 1387        
20 B2u 1365 1303        
21 B2u 1116 1066        
22 B2u 342 327        
23 B3g 3214 3069        
24 B3g 1664 1588        
25 B3g 1304 1245        
26 B3g 642 613        
27 B3g 437 417        
28 B3u 798 762        
29 B3u 492 470        
30 B3u 159 152        

Unscaled Zero Point Vibrational Energy (zpe) 18233.5 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 17409.3 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 MP4/6-31G*
ABC
0.18645 0.04691 0.03748

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/6-31G*

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 1.223 0.700
C4 0.000 -1.223 0.700
C5 0.000 -1.223 -0.700
C6 0.000 1.223 -0.700
F7 0.000 0.000 2.734
F8 0.000 0.000 -2.734
H9 0.000 2.152 1.268
H10 0.000 -2.152 1.268
H11 0.000 -2.152 -1.268
H12 0.000 2.152 -1.268

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.74541.39531.39532.40672.40671.36174.10702.15422.15423.40643.4064
C22.74542.40672.40671.39531.39534.10701.36173.40643.40642.15422.1542
C31.39532.40672.44532.81801.40072.37323.64581.08883.42173.90652.1768
C41.39532.40672.44531.40072.81802.37323.64583.42171.08882.17683.9065
C52.40671.39532.81801.40072.44533.64582.37323.90652.17681.08883.4217
C62.40671.39531.40072.81802.44533.64582.37322.17683.90653.42171.0888
F71.36174.10702.37322.37323.64583.64585.46872.60372.60374.54424.5442
F84.10701.36173.64583.64582.37322.37325.46874.54424.54422.60372.6037
H92.15423.40641.08883.42173.90652.17682.60374.54424.30334.99522.5364
H102.15423.40643.42171.08882.17683.90652.60374.54424.30332.53644.9952
H113.40642.15423.90652.17681.08883.42174.54422.60374.99522.53644.3033
H123.40642.15422.17683.90653.42171.08884.54422.60372.53644.99524.3033

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 118.806 C1 C3 H9 119.760
C1 C4 C5 118.806 C1 C4 H10 119.760
C2 C5 C4 118.806 C2 C5 H11 119.760
C2 C6 C3 118.806 C2 C6 H12 119.760
C3 C1 C4 122.387 C3 C1 F7 118.806
C3 C6 H12 121.434 C4 C1 F7 118.806
C4 C5 H11 121.434 C5 C2 C6 122.387
C5 C2 F8 118.806 C5 C4 H10 121.434
C6 C2 F8 118.806 C6 C3 H9 121.434
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability