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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CBS-Q
 hartrees
Energy at 0K-156.860366
Energy at 298.15K-156.854748
HF Energy-156.093280
Nuclear repulsion energy124.490832
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 CBS-Q
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' 3374 3374 45.24      
2 A' 3301 3301 17.32      
3 A' 3290 3290 31.40      
4 A' 3243 3243 29.76      
5 A' 3178 3178 41.62      
6 A' 1662 1662 0.80      
7 A' 1636 1636 5.61      
8 A' 1567 1567 2.19      
9 A' 1516 1516 3.46      
10 A' 1332 1332 0.08      
11 A' 1300 1300 0.09      
12 A' 1177 1177 2.97      
13 A' 1068 1068 8.73      
14 A' 1016 1016 3.95      
15 A' 853 853 3.54      
16 A' 825 825 4.60      
17 A' 387 387 0.17      
18 A" 3358 3358 0.31      
19 A" 3281 3281 37.03      
20 A" 3242 3242 45.67      
21 A" 1628 1628 1.15      
22 A" 1601 1601 0.76      
23 A" 1307 1307 0.24      
24 A" 1261 1261 0.43      
25 A" 1208 1208 3.99      
26 A" 1193 1193 0.50      
27 A" 945 945 10.65      
28 A" 887 887 5.39      
29 A" 365 365 0.51      
30 A" 238 238 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 25619.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 25619.4 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 CBS-Q
ABC
0.51711 0.21097 0.18534

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.346 0.398 0.000
C2 -0.880 1.287 0.000
H3 1.283 0.935 0.000
C4 0.346 -0.900 0.752
C5 0.346 -0.900 -0.752
H6 1.247 -1.202 1.262
H7 1.247 -1.202 -1.262
H8 -0.562 -1.193 1.257
H9 -0.562 -1.193 -1.257
H10 -1.794 0.694 0.000
H11 -0.901 1.927 0.881
H12 -0.901 1.927 -0.881

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51421.08071.50021.50022.22812.22812.22132.22132.15972.16102.1610
C21.51422.19172.61752.61753.50873.50872.79792.79791.08891.08911.0891
H31.08072.19172.19412.19412.48232.48233.08463.08463.08632.55582.5558
C41.50022.61752.19411.50361.07882.22721.07952.22382.77203.09303.4950
C51.50022.61752.19411.50362.22721.07882.22381.07952.77203.49503.0930
H62.22813.50872.48231.07882.22722.52491.80953.10193.79913.81464.3587
H72.22813.50872.48232.22721.07882.52493.10191.80953.79914.35873.8146
H82.22132.79793.08461.07952.22381.80953.10192.51392.57983.16063.7970
H92.22132.79793.08462.22381.07953.10191.80952.51392.57983.79703.1606
H102.15971.08893.08632.77202.77203.79913.79912.57982.57981.75841.7584
H112.16101.08912.55583.09303.49503.81464.35873.16063.79701.75841.7614
H122.16101.08912.55583.49503.09304.35873.81463.79703.16061.75841.7614

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 111.075 C1 C2 H11 111.164
C1 C2 H12 111.164 C1 C4 H5 59.924
C1 C4 H6 118.614 C1 C4 H8 117.956
C1 H5 C4 59.924 C1 H5 H7 118.614
C1 H5 H9 117.956 C2 C1 C3 114.225
C2 C1 C4 120.532 C2 C1 H5 120.532
C3 C1 C4 115.494 C3 C1 H5 115.494
C4 C1 H5 60.151 C4 H5 H7 118.252
C4 H5 H9 117.901 H5 C4 H6 118.252
H5 C4 H8 117.901 H6 C4 H8 113.935
H7 H5 H9 113.935 H10 C2 H11 107.675
H10 C2 H12 107.675 H11 C2 H12 107.924
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability