return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: MP2=FULL/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=FULL/6-31G**
 hartrees
Energy at 0K-429.560470
Energy at 298.15K 
HF Energy-428.409135
Nuclear repulsion energy340.906284
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**
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 3305 3088 0.00 246.14 0.15 0.27
2 Ag 1699 1587 0.00 7.06 0.68 0.81
3 Ag 1318 1232 0.00 14.12 0.17 0.29
4 Ag 1184 1106 0.00 8.85 0.68 0.81
5 Ag 879 822 0.00 30.42 0.10 0.18
6 Ag 455 425 0.00 4.38 0.46 0.63
7 Au 911 851 0.00 0.00 0.50 0.67
8 Au 419 391 0.00 0.00 0.50 0.67
9 B1g 811 758 0.00 5.06 0.75 0.86
10 B1u 3291 3075 3.53 0.00 0.00 0.00
11 B1u 1582 1478 238.80 0.00 0.00 0.00
12 B1u 1265 1182 149.31 0.00 0.00 0.00
13 B1u 1039 971 3.37 0.00 0.00 0.00
14 B1u 756 706 46.53 0.00 0.00 0.00
15 B2g 872 815 0.00 2.41 0.75 0.86
16 B2g 522 488 0.00 2.03 0.75 0.86
17 B2g 366 342 0.00 2.61 0.75 0.86
18 B2u 3304 3088 0.36 0.00 0.00 0.00
19 B2u 1488 1390 1.15 0.00 0.00 0.00
20 B2u 1449 1354 0.15 0.00 0.00 0.00
21 B2u 1125 1051 12.16 0.00 0.00 0.00
22 B2u 348 325 4.70 0.00 0.00 0.00
23 B3g 3293 3077 0.00 113.43 0.75 0.86
24 B3g 1689 1578 0.00 5.59 0.75 0.86
25 B3g 1318 1232 0.00 2.12 0.75 0.86
26 B3g 649 606 0.00 7.16 0.75 0.86
27 B3g 443 414 0.00 0.11 0.75 0.86
28 B3u 823 769 87.54 0.00 0.00 0.00
29 B3u 507 474 6.98 0.00 0.00 0.00
30 B3u 161 150 1.59 0.00 0.00 0.00

Unscaled Zero Point Vibrational Energy (zpe) 18633.7 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 17411.3 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=FULL/6-31G**
ABC
0.18868 0.04730 0.03782

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/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 1.216 0.697
C4 0.000 -1.216 0.697
C5 0.000 -1.216 -0.697
C6 0.000 1.216 -0.697
F7 0.000 0.000 2.723
F8 0.000 0.000 -2.723
H9 0.000 2.137 1.261
H10 0.000 -2.137 1.261
H11 0.000 -2.137 -1.261
H12 0.000 2.137 -1.261

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.73611.38871.38872.39612.39611.35504.09112.13932.13933.38743.3874
C22.73612.39612.39611.38871.38874.09111.35503.38743.38742.13932.1393
C31.38872.39612.43142.80241.39362.36303.62951.07983.39943.88192.1631
C41.38872.39612.43141.39362.80242.36303.62953.39941.07982.16313.8819
C52.39611.38872.80241.39362.43143.62952.36303.88192.16311.07983.3994
C62.39611.38871.39362.80242.43143.62952.36302.16313.88193.39941.0798
F71.35504.09112.36302.36303.62953.62955.44612.58922.58924.52044.5204
F84.09111.35503.62953.62952.36302.36305.44614.52044.52042.58922.5892
H92.13933.38741.07983.39943.88192.16312.58924.52044.27324.96152.5210
H102.13933.38743.39941.07982.16313.88192.58924.52044.27322.52104.9615
H113.38742.13933.88192.16311.07983.39944.52042.58924.96152.52104.2732
H123.38742.13932.16313.88193.39941.07984.52042.58922.52104.96154.2732

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 118.906 C1 C3 H9 119.621
C1 C4 C5 118.906 C1 C4 H10 119.621
C2 C5 C4 118.906 C2 C5 H11 119.621
C2 C6 C3 118.906 C2 C6 H12 119.621
C3 C1 C4 122.189 C3 C1 F7 118.906
C3 C6 H12 121.473 C4 C1 F7 118.906
C4 C5 H11 121.473 C5 C2 C6 122.189
C5 C2 F8 118.906 C5 C4 H10 121.473
C6 C2 F8 118.906 C6 C3 H9 121.473
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability