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 C3H5 (Allyl radical)

using model chemistry: MP2/CEP-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 2A2
Energy calculated at MP2/CEP-31G
 hartrees
Energy at 0K-19.478922
Energy at 298.15K-19.483148
HF Energy-19.279046
Nuclear repulsion energy35.263324
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/CEP-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 3285 3174 58.32      
2 A1 3182 3075 4.85      
3 A1 3160 3054 26.85      
4 A1 1550 1498 3.72      
5 A1 1296 1253 0.08      
6 A1 1042 1007 0.33      
7 A1 426 412 0.00      
8 A2 731 707 0.00      
9 A2 558 540 0.00      
10 B1 1039 1004 47.03      
11 B1 767 741 151.32      
12 B1 541 523 22.94      
13 B2 3277 3167 17.72      
14 B2 3163 3056 34.67      
15 B2 1527 1476 1.24      
16 B2 1433 1385 6.73      
17 B2 1185 1145 0.01      
18 B2 941 909 0.30      

Unscaled Zero Point Vibrational Energy (zpe) 14551.8 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 14061.4 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/CEP-31G
ABC
1.72951 0.32802 0.27572

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.465
H2 0.000 0.000 1.567
C3 0.000 1.260 -0.205
C4 0.000 -1.260 -0.205
H5 0.000 2.206 0.355
H6 0.000 -2.206 0.355
H7 0.000 1.318 -1.303
H8 0.000 -1.318 -1.303

Atom - Atom Distances (Å)
  C1 H2 C3 C4 H5 H6 H7 H8
C11.10191.42661.42662.20842.20842.20502.2050
H21.10192.17372.17372.51642.51643.15793.1579
C31.42662.17372.51951.09943.51041.09982.8018
C41.42662.17372.51953.51041.09942.80181.0998
H52.20842.51641.09943.51044.41141.88123.8943
H62.20842.51643.51041.09944.41143.89431.8812
H72.20503.15791.09982.80181.88123.89432.6356
H82.20503.15792.80181.09983.89431.88122.6356

picture of Allyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 H5 121.371 C1 C3 H7 121.019
C1 C4 H6 121.371 C1 C4 H8 121.019
H2 C1 C3 117.991 H2 C1 C4 117.991
C3 C1 C4 124.017 H5 C3 H7 117.610
H6 C4 H8 117.610
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability