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: BLYP/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 BLYP/6-31G
 hartrees
Energy at 0K-157.066742
Energy at 298.15K-157.075254
HF Energy-157.066742
Nuclear repulsion energy122.458851
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 BLYP/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' 3160 3136 43.03      
2 A' 3075 3052 4.88      
3 A' 3069 3046 39.15      
4 A' 3019 2996 25.69      
5 A' 2952 2930 43.81      
6 A' 1509 1497 5.45      
7 A' 1497 1485 2.44      
8 A' 1424 1413 2.24      
9 A' 1386 1376 3.35      
10 A' 1213 1204 0.12      
11 A' 1198 1189 0.07      
12 A' 1052 1044 15.98      
13 A' 981 973 1.23      
14 A' 932 925 5.69      
15 A' 790 784 1.98      
16 A' 744 738 5.18      
17 A' 365 362 0.18      
18 A" 3142 3119 0.31      
19 A" 3067 3044 29.71      
20 A" 3015 2992 42.29      
21 A" 1502 1490 1.95      
22 A" 1480 1468 2.15      
23 A" 1188 1179 0.45      
24 A" 1138 1129 1.36      
25 A" 1100 1091 5.58      
26 A" 1075 1067 1.55      
27 A" 832 826 0.01      
28 A" 818 812 13.08      
29 A" 338 335 0.89      
30 A" 217 216 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23638.6 cm-1
Scaled (by 0.9924) Zero Point Vibrational Energy (zpe) 23458.9 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 BLYP/6-31G
ABC
0.50741 0.20505 0.17973

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.349 0.410 0.000
C2 -0.886 1.308 0.000
H3 1.298 0.957 0.000
C4 0.349 -0.918 0.767
C5 0.349 -0.918 -0.767
H6 1.259 -1.225 1.289
H7 1.259 -1.225 -1.289
H8 -0.571 -1.212 1.281
H9 -0.571 -1.212 -1.281
H10 -1.814 0.708 0.000
H11 -0.910 1.959 0.893
H12 -0.910 1.959 -0.893

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.52691.09631.53341.53342.27182.27182.26202.26202.18312.18652.1865
C21.52692.21262.65842.65843.56033.56032.84412.84411.10511.10531.1053
H31.09632.21262.23762.23762.53452.53453.13713.13713.12252.58402.5840
C41.53342.65842.23761.53491.09302.26981.09382.26482.81213.14243.5519
C51.53342.65842.23761.53492.26981.09302.26481.09382.81213.55193.1424
H62.27183.56032.53451.09302.26982.57831.83003.15523.85193.87214.4270
H72.27183.56032.53452.26981.09302.57833.15521.83003.85194.42703.8721
H82.26202.84413.13711.09382.26481.83003.15522.56232.62113.21223.8593
H92.26202.84413.13712.26481.09383.15521.83002.56232.62113.85933.2122
H102.18311.10513.12252.81212.81213.85193.85192.62112.62111.78341.7834
H112.18651.10532.58403.14243.55193.87214.42703.21223.85931.78341.7860
H122.18651.10532.58403.55193.14244.42703.87213.85933.21221.78341.7860

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 111.074 C1 C2 H11 111.326
C1 C2 H12 111.326 C1 C4 H5 59.968
C1 C4 H6 118.801 C1 C4 H8 117.889
C1 H5 C4 59.968 C1 H5 H7 118.801
C1 H5 H9 117.889 C2 C1 C3 114.011
C2 C1 C4 120.610 C2 C1 H5 120.610
C3 C1 C4 115.619 C3 C1 H5 115.619
C4 C1 H5 60.064 C4 H5 H7 118.509
C4 H5 H9 118.011 H5 C4 H6 118.509
H5 C4 H8 118.011 H6 C4 H8 113.624
H7 H5 H9 113.624 H10 C2 H11 107.574
H10 C2 H12 107.574 H11 C2 H12 107.783
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.080      
2 C -0.364      
3 H 0.109      
4 C -0.248      
5 C -0.248      
6 H 0.119      
7 H 0.119      
8 H 0.120      
9 H 0.120      
10 H 0.114      
11 H 0.120      
12 H 0.120      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.008 0.125 0.000 0.125
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.356 0.130 0.000
y 0.130 -27.125 0.000
z 0.000 0.000 -26.996
Traceless
 xyz
x 1.705 0.130 0.000
y 0.130 -0.949 0.000
z 0.000 0.000 -0.755
Polar
3z2-r2-1.510
x2-y21.769
xy0.130
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.906 -0.408 0.000
y -0.408 6.364 0.000
z 0.000 0.000 5.952


<r2> (average value of r2) Å2
<r2> 85.575
(<r2>)1/2 9.251