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 C3H4 (cyclopropene)

using model chemistry: CCSD/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 CCSD/6-31G*
 hartrees
Energy at 0K-116.232372
Energy at 298.15K-116.235580
HF Energy-115.821592
Nuclear repulsion energy63.656180
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 CCSD/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 3344 3158 0.00      
2 A1 3098 2926 55.55      
3 A1 1748 1651 13.12      
4 A1 1572 1484 3.12      
5 A1 1207 1139 0.49      
6 A1 955 902 3.46      
7 A2 1040 982 0.00      
8 A2 825 779 0.00      
9 B1 3163 2987 52.12      
10 B1 1139 1076 1.88      
11 B1 581 549 74.18      
12 B2 3299 3116 0.18      
13 B2 1112 1050 31.76      
14 B2 1073 1013 25.88      
15 B2 820 774 12.22      

Unscaled Zero Point Vibrational Energy (zpe) 12488.2 cm-1
Scaled (by 0.9443) Zero Point Vibrational Energy (zpe) 11792.6 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 CCSD/6-31G*
ABC
0.99770 0.73020 0.46041

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.861
C2 0.000 0.650 -0.501
C3 0.000 -0.650 -0.501
H4 0.000 1.586 -1.041
H5 0.000 -1.586 -1.041
H6 0.914 0.000 1.462
H7 -0.914 0.000 1.462

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.50941.50942.47672.47671.09391.0939
C21.50941.30031.08032.30012.26102.2610
C31.50941.30032.30011.08032.26102.2610
H42.47671.08032.30013.17103.10123.1012
H52.47672.30011.08033.17103.10123.1012
H61.09392.26102.26103.10123.10121.8282
H71.09392.26102.26103.10123.10121.8282

picture of cyclopropene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 64.485 C1 C2 H4 145.538
C1 C3 C2 64.485 C1 C3 H5 145.538
C2 C1 C3 51.029 C2 C1 H6 119.718
C2 C1 H7 119.718 C2 C3 H5 149.976
C3 C1 H6 119.718 C3 C1 H7 119.718
C3 C2 H4 149.976 H6 C1 H7 113.362
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability