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: mPW1PW91/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at mPW1PW91/TZVP
 hartrees
Energy at 0K-157.228757
Energy at 298.15K-157.237376
HF Energy-157.228757
Nuclear repulsion energy124.693541
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 mPW1PW91/TZVP
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' 3243 3094 22.47      
2 A' 3165 3019 17.86      
3 A' 3153 3008 11.99      
4 A' 3117 2974 19.37      
5 A' 3045 2905 33.64      
6 A' 1523 1453 1.72      
7 A' 1504 1435 10.25      
8 A' 1434 1368 4.21      
9 A' 1400 1336 1.53      
10 A' 1248 1190 0.00      
11 A' 1219 1163 0.00      
12 A' 1061 1012 6.85      
13 A' 1014 967 13.32      
14 A' 948 905 3.37      
15 A' 808 771 6.88      
16 A' 782 746 2.45      
17 A' 366 349 0.22      
18 A" 3229 3080 0.24      
19 A" 3148 3004 23.93      
20 A" 3114 2971 27.92      
21 A" 1495 1427 2.38      
22 A" 1473 1405 4.34      
23 A" 1203 1148 0.82      
24 A" 1147 1095 0.12      
25 A" 1115 1064 5.39      
26 A" 1076 1026 1.77      
27 A" 890 849 9.13      
28 A" 826 788 5.52      
29 A" 348 332 0.84      
30 A" 225 215 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24159.2 cm-1
Scaled (by 0.954) Zero Point Vibrational Energy (zpe) 23047.8 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 mPW1PW91/TZVP
ABC
0.52561 0.21323 0.18736

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/TZVP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.345 0.401 0.000
C2 -0.877 1.276 0.000
H3 1.288 0.939 0.000
C4 0.345 -0.896 0.751
C5 0.345 -0.896 -0.751
H6 1.250 -1.199 1.262
H7 1.250 -1.199 -1.262
H8 -0.569 -1.183 1.255
H9 -0.569 -1.183 -1.255
H10 -1.787 0.672 0.000
H11 -0.907 1.918 0.883
H12 -0.907 1.918 -0.883

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.50321.08481.49881.49882.22992.22992.21822.21822.14962.15632.1563
C21.50322.19082.60292.60293.49903.49902.77762.77761.09241.09251.0925
H31.08482.19082.19502.19502.48332.48333.08623.08623.08642.56032.5603
C41.49882.60292.19501.50201.08212.22761.08302.22302.75123.08303.4869
C51.49882.60292.19501.50202.22761.08212.22301.08302.75123.48693.0830
H62.22993.49902.48331.08212.22762.52421.81903.10533.78363.80974.3558
H72.22993.49902.48332.22761.08212.52423.10531.81903.78364.35583.8097
H82.21822.77763.08621.08302.22301.81903.10532.50932.54893.14163.7818
H92.21822.77763.08622.22301.08303.10531.81902.50932.54893.78183.1416
H102.14961.09243.08642.75122.75123.78363.78362.54892.54891.76321.7632
H112.15631.09252.56033.08303.48693.80974.35583.14163.78181.76321.7665
H122.15631.09252.56033.48693.08304.35583.80973.78183.14161.76321.7665

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.835 C1 C2 H11 111.363
C1 C2 H12 111.363 C1 C4 H5 59.929
C1 C4 H6 118.649 C1 C4 H8 117.545
C1 H5 C4 59.929 C1 H5 H7 118.649
C1 H5 H9 117.545 C2 C1 C3 114.710
C2 C1 C4 120.235 C2 C1 H5 120.235
C3 C1 C4 115.397 C3 C1 H5 115.397
C4 C1 H5 60.142 C4 H5 H7 118.186
C4 H5 H9 117.714 H5 C4 H6 118.186
H5 C4 H8 117.714 H6 C4 H8 114.316
H7 H5 H9 114.316 H10 C2 H11 107.610
H10 C2 H12 107.610 H11 C2 H12 107.885
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.094      
2 C -0.341      
3 H 0.154      
4 C -0.309      
5 C -0.309      
6 H 0.143      
7 H 0.143      
8 H 0.136      
9 H 0.136      
10 H 0.104      
11 H 0.119      
12 H 0.119      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.026 0.141 0.000 0.143
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.237 0.202 0.000
y 0.202 -27.292 0.000
z 0.000 0.000 -27.056
Traceless
 xyz
x 1.936 0.202 0.000
y 0.202 -1.145 0.000
z 0.000 0.000 -0.792
Polar
3z2-r2-1.583
x2-y22.054
xy0.202
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.490 -0.468 0.000
y -0.468 7.226 0.000
z 0.000 0.000 6.716


<r2> (average value of r2) Å2
<r2> 82.995
(<r2>)1/2 9.110