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(2df,p)

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(2df,p)
 hartrees
Energy at 0K-192.813500
Energy at 298.15K-192.820026
HF Energy-192.813500
Nuclear repulsion energy157.543494
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(2df,p)
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 3383 3063 4.38      
2 A1 3355 3038 15.31      
3 A1 3161 2862 24.09      
4 A1 1729 1566 1.59      
5 A1 1555 1408 2.51      
6 A1 1516 1372 12.08      
7 A1 1222 1106 0.10      
8 A1 1058 958 0.39      
9 A1 976 884 7.39      
10 A1 862 781 0.01      
11 A2 1237 1121 0.00      
12 A2 1072 971 0.00      
13 A2 812 735 0.00      
14 A2 559 506 0.00      
15 B1 3189 2887 20.94      
16 B1 1080 978 1.71      
17 B1 1030 932 28.42      
18 B1 750 679 60.27      
19 B1 381 345 4.65      
20 B2 3374 3055 34.03      
21 B2 3344 3028 2.57      
22 B2 1804 1634 0.49      
23 B2 1438 1302 1.01      
24 B2 1394 1263 1.22      
25 B2 1206 1092 0.85      
26 B2 1028 931 10.91      
27 B2 862 780 6.94      

Unscaled Zero Point Vibrational Energy (zpe) 21688.1 cm-1
Scaled (by 0.9055) Zero Point Vibrational Energy (zpe) 19638.6 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(2df,p)
ABC
0.28670 0.27608 0.14435

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.874 0.000 1.866
H2 -0.874 0.000 1.866
H3 0.000 2.197 0.597
H4 0.000 -2.197 0.597
H5 0.000 1.345 -1.866
H6 0.000 -1.345 -1.866
C7 0.000 1.174 0.272
C8 0.000 -1.174 0.272
C9 0.000 0.000 1.215
C10 0.000 0.738 -0.979
C11 0.000 -0.738 -0.979

Atom - Atom Distances (Å)
  H1 H2 H3 H4 H5 H6 C7 C8 C9 C10 C11
H11.74732.68332.68334.06204.06202.16362.16361.08943.06693.0669
H21.74732.68332.68334.06204.06202.16362.16361.08943.06693.0669
H32.68332.68334.39332.60574.31331.07313.38592.28212.14713.3315
H42.68332.68334.39334.31332.60573.38591.07312.28213.33152.1471
H54.06204.06202.60574.31332.68942.14513.30373.36191.07392.2639
H64.06204.06204.31332.60572.68943.30372.14513.36192.26391.0739
C72.16362.16361.07313.38592.14513.30372.34741.50561.32532.2855
C82.16362.16363.38591.07313.30372.14512.34741.50562.28551.3253
C91.08941.08942.28212.28213.36193.36191.50561.50562.31572.3157
C103.06693.06692.14713.33151.07392.26391.32532.28552.31571.4770
C113.06693.06693.33152.14712.26391.07392.28551.32532.31571.4770

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 106.631 H1 C9 C7 111.973
H1 C9 C8 111.973 H2 C9 C7 111.973
H2 C9 C8 111.973 H3 C7 C9 123.634
H3 C7 C10 126.758 H4 C8 C9 123.634
H4 C8 C11 126.758 H5 C10 C7 126.464
H5 C10 C11 124.365 H6 C11 C8 126.464
H6 C11 C10 124.365 C7 C9 C8 102.442
C7 C10 C11 109.171 C8 C11 C10 109.171
C9 C7 C10 109.608 C9 C8 C11 109.608
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.144      
2 H 0.144      
3 H 0.143      
4 H 0.143      
5 H 0.143      
6 H 0.143      
7 C -0.150      
8 C -0.150      
9 C -0.285      
10 C -0.138      
11 C -0.138      


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 0.284 0.284
CHELPG        
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 4.085 0.000 0.000
y 0.000 7.610 0.000
z 0.000 0.000 8.809


<r2> (average value of r2) Å2
<r2> 92.056
(<r2>)1/2 9.595