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: B3PW91/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3PW91/cc-pVTZ
 hartrees
Energy at 0K-157.214689
Energy at 298.15K-157.223284
HF Energy-157.214689
Nuclear repulsion energy124.588513
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 B3PW91/cc-pVTZ
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' 3221 3097 23.84      
2 A' 3143 3022 17.66      
3 A' 3133 3013 13.49      
4 A' 3094 2975 19.51      
5 A' 3026 2909 34.51      
6 A' 1511 1453 1.41      
7 A' 1493 1435 8.97      
8 A' 1421 1367 3.85      
9 A' 1391 1338 1.85      
10 A' 1240 1192 0.01      
11 A' 1210 1164 0.01      
12 A' 1054 1013 5.66      
13 A' 1007 968 11.13      
14 A' 941 905 2.93      
15 A' 801 770 6.11      
16 A' 774 744 1.71      
17 A' 361 347 0.17      
18 A" 3206 3083 0.21      
19 A" 3129 3009 25.18      
20 A" 3090 2972 27.71      
21 A" 1485 1428 2.22      
22 A" 1463 1407 3.23      
23 A" 1195 1149 0.61      
24 A" 1141 1097 0.10      
25 A" 1108 1065 4.95      
26 A" 1070 1029 1.17      
27 A" 884 850 8.08      
28 A" 819 788 4.99      
29 A" 344 331 0.68      
30 A" 225 216 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23988.6 cm-1
Scaled (by 0.9616) Zero Point Vibrational Energy (zpe) 23067.5 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 B3PW91/cc-pVTZ
ABC
0.52548 0.21260 0.18678

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.345 0.400 0.000
C2 -0.876 1.280 0.000
H3 1.287 0.938 0.000
C4 0.345 -0.898 0.751
C5 0.345 -0.898 -0.751
H6 1.249 -1.202 1.263
H7 1.249 -1.202 -1.263
H8 -0.569 -1.186 1.256
H9 -0.569 -1.186 -1.256
H10 -1.789 0.680 0.000
H11 -0.903 1.923 0.883
H12 -0.903 1.923 -0.883

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.50511.08481.49981.49982.23112.23112.22032.22032.15192.15812.1581
C21.50512.19012.60762.60763.50293.50292.78492.78491.09261.09281.0928
H31.08482.19012.19582.19582.48452.48453.08773.08773.08672.55892.5589
C41.49982.60762.19581.50291.08222.22861.08312.22482.75793.08763.4911
C51.49982.60762.19581.50292.22861.08222.22481.08312.75793.49113.0876
H62.23113.50292.48451.08222.22862.52551.81803.10663.78983.81324.3591
H72.23113.50292.48452.22861.08222.52553.10661.81803.78984.35913.8132
H82.22032.78493.08771.08312.22481.81803.10662.51282.55903.14953.7892
H92.22032.78493.08772.22481.08313.10661.81802.51282.55903.78923.1495
H102.15191.09263.08672.75792.75793.78983.78982.55902.55901.76381.7638
H112.15811.09282.55893.08763.49113.81324.35913.14953.78921.76381.7664
H122.15811.09282.55893.49113.08764.35913.81323.78923.14951.76381.7664

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.872 C1 C2 H11 111.352
C1 C2 H12 111.352 C1 C4 H5 59.930
C1 C4 H6 118.662 C1 C4 H8 117.642
C1 H5 C4 59.930 C1 H5 H7 118.662
C1 H5 H9 117.642 C2 C1 C3 114.506
C2 C1 C4 120.404 C2 C1 H5 120.404
C3 C1 C4 115.394 C3 C1 H5 115.394
C4 C1 H5 60.140 C4 H5 H7 118.191
C4 H5 H9 117.788 H5 C4 H6 118.191
H5 C4 H8 117.788 H6 C4 H8 114.200
H7 H5 H9 114.200 H10 C2 H11 107.625
H10 C2 H12 107.625 H11 C2 H12 107.839
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.058      
2 C -0.266      
3 H 0.100      
4 C -0.215      
5 C -0.215      
6 H 0.099      
7 H 0.099      
8 H 0.096      
9 H 0.096      
10 H 0.081      
11 H 0.092      
12 H 0.092      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.034 0.124 0.000 0.128
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.300 0.227 0.000
y 0.227 -27.255 0.000
z 0.000 0.000 -27.000
Traceless
 xyz
x 1.828 0.227 0.000
y 0.227 -1.105 0.000
z 0.000 0.000 -0.723
Polar
3z2-r2-1.445
x2-y21.955
xy0.227
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.574 -0.517 0.000
y -0.517 7.308 0.000
z 0.000 0.000 6.740


<r2> (average value of r2) Å2
<r2> 83.155
(<r2>)1/2 9.119