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

using model chemistry: QCISD/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 QCISD/6-31G
 hartrees
Energy at 0K-429.064416
Energy at 298.15K-429.068890
Nuclear repulsion energy334.618405
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 QCISD/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 3202 3086 0.00      
2 Ag 1650 1590 0.00      
3 Ag 1253 1207 0.00      
4 Ag 1190 1146 0.00      
5 Ag 850 819 0.00      
6 Ag 448 432 0.00      
7 Au 885 852 0.00      
8 Au 419 403 0.00      
9 B1g 796 767 0.00      
10 B1u 3185 3069 3.54      
11 B1u 1549 1492 141.03      
12 B1u 1227 1183 99.28      
13 B1u 1040 1002 3.53      
14 B1u 720 694 40.66      
15 B2g 842 811 0.00      
16 B2g 523 504 0.00      
17 B2g 357 344 0.00      
18 B2u 3200 3084 2.49      
19 B2u 1442 1390 0.05      
20 B2u 1267 1221 0.03      
21 B2u 1123 1082 9.56      
22 B2u 326 315 9.13      
23 B3g 3186 3070 0.00      
24 B3g 1650 1590 0.00      
25 B3g 1327 1279 0.00      
26 B3g 650 626 0.00      
27 B3g 428 412 0.00      
28 B3u 796 767 115.56      
29 B3u 476 459 6.23      
30 B3u 155 149 4.30      

Unscaled Zero Point Vibrational Energy (zpe) 18080.1 cm-1
Scaled (by 0.9636) Zero Point Vibrational Energy (zpe) 17422.0 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 QCISD/6-31G
ABC
0.18324 0.04541 0.03639

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.376
C2 0.000 0.000 -1.376
C3 0.000 1.234 0.706
C4 0.000 -1.234 0.706
C5 0.000 -1.234 -0.706
C6 0.000 1.234 -0.706
F7 0.000 0.000 2.788
F8 0.000 0.000 -2.788
H9 0.000 2.165 1.275
H10 0.000 -2.165 1.275
H11 0.000 -2.165 -1.275
H12 0.000 2.165 -1.275

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 F7 F8 H9 H10 H11 H12
C12.75151.40391.40392.42052.42051.41184.16332.16712.16713.42273.4227
C22.75152.42052.42051.40391.40394.16331.41183.42273.42272.16712.1671
C31.40392.42052.46822.84401.41302.41953.70561.09083.44623.93452.1895
C41.40392.42052.46821.41302.84402.41953.70563.44621.09082.18953.9345
C52.42051.40392.84401.41302.46823.70562.41953.93452.18951.09083.4462
C62.42051.40391.41302.84402.46823.70562.41952.18953.93453.44621.0908
F71.41184.16332.41952.41953.70563.70565.57512.64072.64074.60374.6037
F84.16331.41183.70563.70562.41952.41955.57514.60374.60372.64072.6407
H92.16713.42271.09083.44623.93452.18952.64074.60374.32965.02512.5508
H102.16713.42273.44621.09082.18953.93452.64074.60374.32962.55085.0251
H113.42272.16713.93452.18951.09083.44624.60372.64075.02512.55084.3296
H123.42272.16712.18953.93453.44621.09084.60372.64072.55085.02514.3296

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 118.472 C1 C3 H9 120.093
C1 C4 C5 118.472 C1 C4 H10 120.093
C2 C5 C4 118.472 C2 C5 H11 120.093
C2 C6 C3 118.472 C2 C6 H12 120.093
C3 C1 C4 123.056 C3 C1 F7 118.472
C3 C6 H12 121.435 C4 C1 F7 118.472
C4 C5 H11 121.435 C5 C2 C6 123.056
C5 C2 F8 118.472 C5 C4 H10 121.435
C6 C2 F8 118.472 C6 C3 H9 121.435
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability