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 C4H6 (Methylenecyclopropane)

using model chemistry: MP2=FULL/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 MP2=FULL/6-31G(2df,p)
 hartrees
Energy at 0K-155.561070
Energy at 298.15K-155.566900
HF Energy-154.907043
Nuclear repulsion energy109.790430
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=FULL/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 3212 3019 6.16      
2 A1 3197 3005 4.30      
3 A1 1877 1764 0.82      
4 A1 1509 1419 0.14      
5 A1 1468 1379 0.39      
6 A1 1100 1034 2.33      
7 A1 1051 988 5.47      
8 A1 777 731 3.62      
9 A2 3285 3088 0.00      
10 A2 1199 1127 0.00      
11 A2 982 923 0.00      
12 A2 631 593 0.00      
13 B1 3296 3098 4.79      
14 B1 1121 1053 0.83      
15 B1 934 878 34.91      
16 B1 771 725 1.24      
17 B1 306 287 3.05      
18 B2 3307 3108 4.63      
19 B2 3196 3004 5.92      
20 B2 1473 1384 1.22      
21 B2 1169 1098 7.37      
22 B2 1084 1019 1.87      
23 B2 936 879 11.25      
24 B2 361 340 0.25      

Unscaled Zero Point Vibrational Energy (zpe) 19119.8 cm-1
Scaled (by 0.9399) Zero Point Vibrational Energy (zpe) 17970.7 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=FULL/6-31G(2df,p)
ABC
0.65919 0.23095 0.18351

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.649
C2 0.000 0.000 0.306
H3 0.000 0.895 2.168
H4 0.000 -0.895 2.168
C5 0.000 0.747 -0.891
C6 0.000 -0.747 -0.891
H7 0.918 0.927 -1.344
H8 -0.918 0.927 -1.344
H9 -0.918 -0.927 -1.344
H10 0.918 -0.927 -1.344

Atom - Atom Distances (Å)
  C1 C2 H3 H4 C5 C6 H7 H8 H9 H10
C11.34281.03501.03502.64782.64783.26483.26483.26483.2648
C21.34282.06592.06591.41141.41142.10352.10352.10352.1035
H31.03502.06591.79093.06283.47223.63003.63004.06164.0616
H41.03502.06591.79093.47223.06284.06164.06163.63003.6300
C52.64781.41143.06283.47221.49391.03901.03901.96191.9619
C62.64781.41143.47223.06281.49391.96191.96191.03901.0390
H73.26482.10353.63004.06161.03901.96191.83552.60881.8539
H83.26482.10353.63004.06161.03901.96191.83551.85392.6088
H93.26482.10354.06163.63001.96191.03902.60881.85391.8355
H103.26482.10354.06163.63001.96191.03901.85392.60881.8355

picture of Methylenecyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C5 148.047 C1 C2 C6 148.047
C2 C1 H3 120.094 C2 C1 H4 120.094
C2 C5 C6 58.047 C2 C5 H7 117.473
C2 C5 H8 117.473 C2 C6 C5 58.047
C2 C6 H9 117.473 C2 C6 H10 117.473
H3 C1 H4 119.811 C5 C2 C6 63.906
C5 C6 H9 99.977 C5 C6 H10 99.977
C6 C5 H7 99.977 C6 C5 H8 99.977
H7 C5 H8 124.083 H9 C6 H10 124.083
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability