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 C4H8 (methylcyclopropane)

using model chemistry: B2PLYP/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B2PLYP/6-31G
 hartrees
Energy at 0K-156.898923
Energy at 298.15K-156.907596
HF Energy-156.777318
Nuclear repulsion energy123.436647
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 B2PLYP/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 A' 3268 3268 33.68      
2 A' 3184 3184 12.95      
3 A' 3176 3176 20.15      
4 A' 3122 3122 25.78      
5 A' 3050 3050 35.75      
6 A' 1566 1566 5.40      
7 A' 1559 1559 3.60      
8 A' 1480 1480 3.72      
9 A' 1448 1448 1.64      
10 A' 1264 1264 0.09      
11 A' 1249 1249 0.03      
12 A' 1122 1122 15.28      
13 A' 1023 1023 3.42      
14 A' 974 974 6.28      
15 A' 826 826 2.03      
16 A' 782 782 6.86      
17 A' 378 378 0.17      
18 A" 3252 3252 0.29      
19 A" 3170 3170 22.50      
20 A" 3124 3124 36.13      
21 A" 1557 1557 1.98      
22 A" 1536 1536 3.12      
23 A" 1241 1241 0.40      
24 A" 1202 1202 1.08      
25 A" 1152 1152 7.26      
26 A" 1140 1140 0.42      
27 A" 879 879 0.86      
28 A" 861 861 14.64      
29 A" 353 353 0.89      
30 A" 221 221 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24577.1 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 24577.1 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 B2PLYP/6-31G
ABC
0.51483 0.20851 0.18279

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP/6-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.347 0.407 0.000
C2 -0.883 1.295 0.000
H3 1.289 0.952 0.000
C4 0.347 -0.909 0.762
C5 0.347 -0.909 -0.762
H6 1.251 -1.214 1.279
H7 1.251 -1.214 -1.279
H8 -0.566 -1.198 1.271
H9 -0.566 -1.198 -1.271
H10 -1.798 0.690 0.000
H11 -0.908 1.939 0.887
H12 -0.908 1.939 -0.887

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51701.08731.52091.52092.25372.25372.24242.24242.16372.16992.1699
C21.51702.19872.63652.63653.53283.53282.81612.81611.09691.09641.0964
H31.08732.19872.22002.22002.51512.51513.11103.11103.09772.56682.5668
C41.52092.63652.22001.52321.08452.25201.08552.24732.78183.11483.5220
C51.52092.63652.22001.52322.25201.08452.24731.08552.78183.52203.1148
H62.25373.53282.51511.08452.25202.55731.81723.13103.81473.84084.3920
H72.25373.53282.51512.25201.08452.55733.13101.81723.81474.39203.8408
H82.24242.81613.11101.08552.24731.81723.13102.54212.58773.17853.8228
H92.24242.81613.11102.24731.08553.13101.81722.54212.58773.82283.1785
H102.16371.09693.09772.78182.78183.81473.81472.58772.58771.77141.7714
H112.16991.09642.56683.11483.52203.84084.39203.17853.82281.77141.7745
H122.16991.09642.56683.52203.11484.39203.84083.82283.17851.77141.7745

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.719 C1 C2 H11 111.236
C1 C2 H12 111.236 C1 C4 H5 59.950
C1 C4 H6 118.815 C1 C4 H8 117.741
C1 H5 C4 59.950 C1 H5 H7 118.815
C1 H5 H9 117.741 C2 C1 C3 114.167
C2 C1 C4 120.422 C2 C1 H5 120.422
C3 C1 C4 115.670 C3 C1 H5 115.670
C4 C1 H5 60.099 C4 H5 H7 118.475
C4 H5 H9 117.991 H5 C4 H6 118.475
H5 C4 H8 117.991 H6 C4 H8 113.745
H7 H5 H9 113.745 H10 C2 H11 107.731
H10 C2 H12 107.731 H11 C2 H12 108.034
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.131      
2 C -0.402      
3 H 0.140      
4 C -0.293      
5 C -0.293      
6 H 0.144      
7 H 0.144      
8 H 0.143      
9 H 0.143      
10 H 0.130      
11 H 0.138      
12 H 0.138      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.010 0.128 0.000 0.128
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.546 0.142 0.000
y 0.142 -27.355 0.000
z 0.000 0.000 -27.180
Traceless
 xyz
x 1.721 0.142 0.000
y 0.142 -0.992 0.000
z 0.000 0.000 -0.729
Polar
3z2-r2-1.458
x2-y21.809
xy0.142
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.702 -0.347 0.000
y -0.347 6.126 0.000
z 0.000 0.000 5.797


<r2> (average value of r2) Å2
<r2> 84.560
(<r2>)1/2 9.196