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 C5H8 (1,2-Pentadiene)

using model chemistry: HF/CEP-121G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at HF/CEP-121G*
 hartrees
Energy at 0K-32.042140
Energy at 298.15K-32.049785
Nuclear repulsion energy85.210153
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/CEP-121G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A 3375 3049 9.64      
2 A 3301 2982 17.69      
3 A 3291 2973 12.90      
4 A 3263 2948 67.31      
5 A 3253 2939 68.34      
6 A 3206 2896 30.09      
7 A 3189 2881 33.27      
8 A 3178 2871 64.11      
9 A 2161 1952 53.95      
10 A 1634 1476 2.11      
11 A 1627 1470 5.69      
12 A 1622 1465 0.66      
13 A 1604 1449 3.06      
14 A 1554 1404 3.04      
15 A 1494 1349 25.66      
16 A 1464 1323 2.48      
17 A 1396 1261 0.85      
18 A 1220 1102 0.95      
19 A 1203 1087 3.54      
20 A 1174 1061 3.61      
21 A 1118 1010 2.41      
22 A 1055 953 0.04      
23 A 989 893 18.34      
24 A 987 891 63.63      
25 A 893 806 1.24      
26 A 845 763 1.37      
27 A 681 616 8.20      
28 A 572 517 2.16      
29 A 391 353 4.06      
30 A 380 343 11.54      
31 A 272 245 0.00      
32 A 163 147 0.58      
33 A 104 94 0.29      

Unscaled Zero Point Vibrational Energy (zpe) 26327.5 cm-1
Scaled (by 0.9034) Zero Point Vibrational Energy (zpe) 23784.3 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 HF/CEP-121G*
ABC
0.34232 0.10511 0.08427

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/CEP-121G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.343 0.529 0.001
C2 1.498 -0.996 -0.000
C3 -0.094 1.031 -0.000
C4 -1.167 0.291 -0.001
C5 -2.246 -0.443 0.000
H6 1.846 0.950 -0.869
H7 1.845 0.950 0.871
H8 1.036 -1.440 0.877
H9 2.551 -1.265 0.000
H10 1.037 -1.439 -0.879
H11 -0.230 2.104 -0.001
H12 -2.708 -0.754 0.924
H13 -2.709 -0.756 -0.922

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.53341.52232.52133.71791.08931.08932.17752.16332.17752.22574.34814.3498
C21.53342.57822.95993.78452.16002.16011.08641.08731.08643.54954.31274.3134
C31.52232.57821.30342.60802.12772.12772.85603.50332.85601.08153.29743.2988
C42.52132.95991.30341.30463.20463.20442.93674.03122.93702.04112.07892.0791
C53.71793.78452.60801.30464.40944.40823.54054.86733.54203.24831.07881.0788
H61.08932.16002.12773.20464.40941.73953.06922.48192.52302.52895.18264.8650
H71.08932.16012.12773.20444.40821.73952.52312.48213.06932.52944.86145.1831
H82.17751.08642.85602.93673.54053.06922.52311.75961.75613.86493.80624.2108
H92.16331.08733.50334.03124.86732.48192.48211.75961.75964.36885.36395.3649
H102.17751.08642.85602.93703.54202.52303.06931.75611.75963.86444.21243.8083
H112.22573.54951.08152.04113.24832.52892.52943.86494.36883.86443.89463.8961
H124.34814.31273.29742.07891.07885.18264.86143.80625.36394.21243.89461.8462
H134.34984.31343.29882.07911.07884.86505.18314.21085.36493.80833.89611.8462

picture of 1,2-Pentadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H8 111.290 C1 C2 H9 110.105
C1 C2 H10 111.288 C1 C3 C4 126.141
C1 C3 H11 116.453 C2 C1 C3 115.069
C2 C1 H6 109.729 C2 C1 H7 109.737
C3 C1 H6 107.971 C3 C1 H7 107.967
C3 C4 C5 179.621 C4 C3 H11 117.406
C4 C5 H12 121.157 C4 C5 H13 121.177
H6 C1 H7 105.960 H8 C2 H9 108.095
H8 C2 H10 107.846 H9 C2 H10 108.093
H12 C5 H13 117.666
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-121G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.219      
2 C -0.505      
3 C -0.402      
4 C 0.420      
5 C -0.674      
6 H 0.153      
7 H 0.153      
8 H 0.162      
9 H 0.163      
10 H 0.162      
11 H 0.205      
12 H 0.191      
13 H 0.191      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.489 0.048 0.002 0.491
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.591 2.179 -0.002
y 2.179 -31.860 0.001
z -0.002 0.001 -32.330
Traceless
 xyz
x 1.505 2.179 -0.002
y 2.179 -0.400 0.001
z -0.002 0.001 -1.105
Polar
3z2-r2-2.210
x2-y21.270
xy2.179
xz-0.002
yz0.001


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 11.554 2.475 0.000
y 2.475 7.993 -0.000
z 0.000 -0.000 5.951


<r2> (average value of r2) Å2
<r2> 120.125
(<r2>)1/2 10.960