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: HF/CEP-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 HF/CEP-31G*
 hartrees
Energy at 0K-25.354504
Energy at 298.15K-25.360450
Nuclear repulsion energy58.543393
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-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 3329 2989 21.41      
2 A1 3309 2971 29.26      
3 A1 1999 1795 5.97      
4 A1 1616 1451 0.87      
5 A1 1552 1394 0.14      
6 A1 1156 1038 1.30      
7 A1 1129 1014 4.36      
8 A1 792 711 13.41      
9 A2 3388 3042 0.00      
10 A2 1262 1133 0.00      
11 A2 1014 911 0.00      
12 A2 648 582 0.00      
13 B1 3403 3055 54.88      
14 B1 1186 1065 4.79      
15 B1 1012 909 66.37      
16 B1 792 711 1.38      
17 B1 341 306 6.79      
18 B2 3403 3056 24.88      
19 B2 3303 2966 38.95      
20 B2 1567 1408 0.33      
21 B2 1217 1093 9.94      
22 B2 1172 1053 3.16      
23 B2 965 867 15.60      
24 B2 359 323 0.28      

Unscaled Zero Point Vibrational Energy (zpe) 19956.0 cm-1
Scaled (by 0.898) Zero Point Vibrational Energy (zpe) 17920.5 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-31G*
ABC
0.64624 0.22465 0.17857

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.666
C2 0.000 0.000 0.326
H3 0.000 0.928 2.224
H4 0.000 -0.928 2.224
C5 0.000 0.775 -0.935
C6 0.000 -0.775 -0.935
H7 0.913 1.276 -1.233
H8 -0.913 1.276 -1.233
H9 -0.913 -1.276 -1.233
H10 0.913 -1.276 -1.233

Atom - Atom Distances (Å)
  C1 C2 H3 H4 C5 C6 H7 H8 H9 H10
C11.34001.08301.08302.71472.71473.29683.29683.29683.2968
C21.34002.11282.11281.48081.48082.21232.21232.21232.2123
H31.08302.11281.85633.16343.58963.59303.59304.20094.2009
H41.08302.11281.85633.58963.16344.20094.20093.59303.5930
C52.71471.48083.16343.58961.55051.08311.08312.26502.2650
C62.71471.48083.58963.16341.55052.26502.26501.08311.0831
H73.29682.21233.59304.20091.08312.26501.82593.13812.5523
H83.29682.21233.59304.20091.08312.26501.82592.55233.1381
H93.29682.21234.20093.59302.26501.08313.13812.55231.8259
H103.29682.21234.20093.59302.26501.08312.55233.13811.8259

picture of Methylenecyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C5 148.429 C1 C2 C6 148.429
C2 C1 H3 121.018 C2 C1 H4 121.018
C2 C5 C6 58.429 C2 C5 H7 118.454
C2 C5 H8 118.454 C2 C6 C5 58.429
C2 C6 H9 118.454 C2 C6 H10 118.454
H3 C1 H4 117.964 C5 C2 C6 63.141
C5 C6 H9 117.545 C5 C6 H10 117.545
C6 C5 H7 117.545 C6 C5 H8 117.545
H7 C5 H8 114.896 H9 C6 H10 114.896
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.003      
2 C 0.056      
3 H 0.186      
4 H 0.186      
5 C -0.506      
6 C -0.506      
7 H 0.146      
8 H 0.146      
9 H 0.146      
10 H 0.146      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -0.438 0.438
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.545 0.000 0.000
y 0.000 -24.193 0.000
z 0.000 0.000 -24.541
Traceless
 xyz
x -1.178 0.000 0.000
y 0.000 0.850 0.000
z 0.000 0.000 0.329
Polar
3z2-r20.657
x2-y2-1.352
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.852 0.000 0.000
y 0.000 5.754 0.000
z 0.000 0.000 8.848


<r2> (average value of r2) Å2
<r2> 66.353
(<r2>)1/2 8.146