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 C5H6 (1,3-Cyclopentadiene)

using model chemistry: HF/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at HF/6-31G
 hartrees
Energy at 0K-192.719043
Energy at 298.15K-192.725657
HF Energy-192.719043
Nuclear repulsion energy157.089040
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 HF/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 A1 3429 3096 5.86      
2 A1 3397 3067 11.17      
3 A1 3183 2874 16.60      
4 A1 1726 1558 1.88      
5 A1 1592 1438 10.81      
6 A1 1536 1387 9.51      
7 A1 1249 1128 0.26      
8 A1 1074 970 0.07      
9 A1 983 888 9.75      
10 A1 896 809 0.00      
11 A2 1263 1140 0.00      
12 A2 1116 1008 0.00      
13 A2 842 760 0.00      
14 A2 582 525 0.00      
15 B1 3215 2903 19.23      
16 B1 1117 1009 2.40      
17 B1 1048 946 34.66      
18 B1 774 699 105.70      
19 B1 395 357 7.54      
20 B2 3417 3085 35.33      
21 B2 3388 3059 1.43      
22 B2 1802 1627 0.97      
23 B2 1461 1319 0.35      
24 B2 1416 1278 5.61      
25 B2 1235 1115 1.39      
26 B2 1054 952 14.74      
27 B2 899 812 5.06      

Unscaled Zero Point Vibrational Energy (zpe) 22044.3 cm-1
Scaled (by 0.9029) Zero Point Vibrational Energy (zpe) 19903.8 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 HF/6-31G
ABC
0.28397 0.27530 0.14344

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.873 0.000 1.869
H2 -0.873 0.000 1.869
H3 0.000 2.198 0.600
H4 0.000 -2.198 0.600
H5 0.000 1.342 -1.870
H6 0.000 -1.342 -1.870
C7 0.000 1.177 0.276
C8 0.000 -1.177 0.276
C9 0.000 0.000 1.221
C10 0.000 0.738 -0.986
C11 0.000 -0.738 -0.986

Atom - Atom Distances (Å)
  H1 H2 H3 H4 H5 H6 C7 C8 C9 C10 C11
H11.74682.68392.68394.06784.06782.16542.16541.08793.07563.0756
H21.74682.68392.68394.06784.06782.16542.16541.08793.07563.0756
H32.68392.68394.39512.61414.31621.07073.39042.28352.15533.3365
H42.68392.68394.39514.31622.61413.39041.07072.28353.33652.1553
H54.06784.06782.61414.31622.68402.15203.30923.36961.07092.2601
H64.06784.06784.31622.61412.68403.30922.15203.36962.26011.0709
C72.16542.16541.07073.39042.15203.30922.35451.50971.33572.2933
C82.16542.16543.39041.07073.30922.15202.35451.50972.29331.3357
C91.08791.08792.28352.28353.36963.36961.50971.50972.32672.3267
C103.07563.07562.15533.33651.07092.26011.33572.29332.32671.4760
C113.07563.07563.33652.15532.26011.07092.29331.33572.32671.4760

picture of 1,3-Cyclopentadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 C9 H2 106.804 H1 C9 C7 111.916
H1 C9 C8 111.916 H2 C9 C7 111.916
H2 C9 C8 111.916 H3 C7 C9 123.601
H3 C7 C10 126.840 H4 C8 C9 123.601
H4 C8 C11 126.840 H5 C10 C7 126.465
H5 C10 C11 124.335 H6 C11 C8 126.465
H6 C11 C10 124.335 C7 C9 C8 102.481
C7 C10 C11 109.200 C8 C11 C10 109.200
C9 C7 C10 109.560 C9 C8 C11 109.560
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.189      
2 H 0.189      
3 H 0.192      
4 H 0.192      
5 H 0.198      
6 H 0.198      
7 C -0.190      
8 C -0.190      
9 C -0.402      
10 C -0.188      
11 C -0.188      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.403 0.403
CHELPG -0.333 0.078 0.000 0.342
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.349 0.000 0.000
y 0.000 7.307 0.000
z 0.000 0.000 8.753


<r2> (average value of r2) Å2
<r2> 92.737
(<r2>)1/2 9.630