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: MP2/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2v 1A1
Energy calculated at MP2/CEP-121G
 hartrees
Energy at 0K-18.890716
Energy at 298.15K-18.893824
HF Energy-18.619517
Nuclear repulsion energy33.130415
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-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 A1 3259 3181 0.99 167.64 0.13 0.24
2 A1 3041 2968 52.22 128.98 0.17 0.28
3 A1 1595 1557 18.95 14.85 0.24 0.39
4 A1 1514 1477 0.12 22.13 0.12 0.21
5 A1 1116 1089 0.01 14.37 0.12 0.21
6 A1 930 908 4.98 10.36 0.35 0.52
7 A2 1006 981 0.00 11.45 0.75 0.86
8 A2 754 736 0.00 0.04 0.75 0.86
9 B1 3145 3069 54.93 83.30 0.75 0.86
10 B1 1101 1075 0.18 3.75 0.75 0.86
11 B1 533 520 123.94 0.87 0.75 0.86
12 B2 3209 3132 1.16 85.07 0.75 0.86
13 B2 1109 1082 33.14 1.26 0.75 0.86
14 B2 1048 1023 34.54 0.15 0.75 0.86
15 B2 713 696 11.96 16.80 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12035.8 cm-1
Scaled (by 0.976) Zero Point Vibrational Energy (zpe) 11746.9 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-121G
ABC
0.95400 0.68207 0.43298

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.901
C2 0.000 0.670 -0.520
C3 0.000 -0.670 -0.520
H4 0.000 1.603 -1.073
H5 0.000 -1.603 -1.073
H6 0.925 0.000 1.488
H7 -0.925 0.000 1.488

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.57071.57072.54262.54261.09571.0957
C21.57071.33961.08452.33882.30972.3097
C31.57071.33962.33881.08452.30972.3097
H42.54261.08452.33883.20533.15933.1593
H52.54262.33881.08453.20533.15933.1593
H61.09572.30972.30973.15933.15931.8508
H71.09572.30972.30973.15933.15931.8508

picture of cyclopropene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 64.759 C1 C2 H4 145.907
C1 C3 C2 64.759 C1 C3 H5 145.907
C2 C1 C3 50.482 C2 C1 H6 118.965
C2 C1 H7 118.965 C2 C3 H5 149.334
C3 C1 H6 118.965 C3 C1 H7 118.965
C3 C2 H4 149.334 H6 C1 H7 115.259
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability